Infosys Coding Interview Questions

June 23, 2022

Infosys Coding Interview Questions 2022

Prepare for Infosys Interview with the latest Infosys Coding Questions. On this page, we have provided Infosys Coding Interview Questions for Freshers.

Infosys Coding Questions 2022

Question 1: Write a Program to Swap Two Numbers.

Program in Python

# Swap two variables in Python
a=int(input(“Enter value : “))
b=int(input(“Enter value : “))
print(“Before swapping a :”,a)
print(“Before swapping b :”,b)
#logic to swap using third variable 
temp=a
a=b
b=temp
print(“After swapping a becomes :”,a)
print(“After swapping b becomes :”,b)

Question 2: Write a Program to Swap Two Numbers without using the Third Variable.

Program in Python

a=int(input(“Enter value : “))
b=int(input(“Enter value : “))

print(“Before swapping a :”,a)
print(“Before swapping b :”,b)
#logic to swap without using third variable 
a=a+b 
b=a-b
a=a-b


print(“After swapping a becomes :”,a)
print(“After swapping b becomes :”,b)

Question 3: Write a Program to Convert Decimal Number to Binary Number.

Program in C

Program in C++

Program in JAVA

Program in Python

Program in C

// Decimal to binary conversion using an Array in C
#include<stdio.h>

void convert(int num)
{
// creating an array to store binary equivalent
int binaryArray[32];

// using i to store binary bit at given array position
int i = 0;
while (num > 0) {

// resultant remainder is stored at given array position
binaryArray[i] = num % 2;
num = num / 2;
i++;
}

// printing binary array in reverse order
for (int j = i - 1; j >= 0; j--)
printf("%d",binaryArray[j]);
}

int main()
{
int n = 11;
convert(n);
return 0;
}

Find More Solutions at: C Program to Concert Decimal to Binary

Program in C++

#include<iostream>
using namespace std;

void convertBinary(int num)
{
// creating an array to store binary equivalent
int binaryArray[32];

// using i to store binary bit at given array position
int i = 0;
while (num > 0) {

// resultant remainder is stored at given array position
binaryArray[i] = num % 2;
num = num / 2;
i++;
}

// printing binary array in reverse order
for (int j = i - 1; j >= 0; j--)
cout << binaryArray[j];
}

int main()
{
int n = 21;
convertBinary(n);
return 0;
}

Find More Solutions at : C++ Program for Decimal to Binary Conversion

Program in JAVA

//Java program to convert decimal number to binary number
public class Main
{
public static void main(String args[])
{ 
//Decimal Number
int decimal = 12;
//integer array for storing binary digits 
int binary[] = new int[20];
int i = 0; 
//writing logic for the conversion 
while(decimal > 0)
{ 
int r = decimal % 2;
binary[i++] = r;
decimal = decimal/2;
}
//printing result
System.out.print("Binary number : ");
for(int j = i-1 ; j >= 0 ; j--)
System.out.print(binary[j]+"");
}
}

Find more solutions at: JAVA Program for Decimal to Binary

Program in Python

def convertBinary(num):
binaryArray = []
while num>0:
binaryArray.append(num%2)
num = num//2
for j in binaryArray:
print(j, end="")


decimal_num = 21
convertBinary(decimal_num)

Find More Solutions at: Python Program for Decimal to Binary Conversion

Question 4: Write a Program to Convert Decimal Number to Octal Number.

Program in C

Program in C++

Program in JAVA

Program in Python

Program in C

// C Program to convert Decimal to Octal using Array
#include<stdio.h>

void convert(int num)
{
// creating an array to store octal equivalent
int octalArray[32];

// using i to store octal bit at given array position
int i = 0;
while (num > 0) {

// resultant remainder is stored at given array position
octalArray[i] = num % 8;
num = num / 8;
i++;
}

// printing octal array in reverse order
for (int j = i - 1; j >= 0; j--)
printf("%d",octalArray[j]);
}

int main()
{
int n = 148;
convert(n);
return 0;
}

Find More Solutions at: C Program for Decimal to Octal Conversion

Program in C++

#include<iostream>
using namespace std;

void convertBinary(int num)
{
// creating an array to store binary equivalent
int binaryArray[32];

// using i to store binary bit at given array position
int i = 0;
while (num > 0) {

// resultant remainder is stored at given array position
binaryArray[i] = num % 2;
num = num / 2;
i++;
}

// printing binary array in reverse order
for (int j = i - 1; j >= 0; j--)
cout << binaryArray[j];
}

int main()
{
int n = 21;
convertBinary(n);
return 0;
}

Find More Solutions at : C++ Program for Decimal to Binary Conversion

Program in JAVA

//Java program to convert decimal number to octal number
import java.util.Scanner;
public class Main
{
public static void main(String args[])
{ 
//scanner class object creation
Scanner sc = new Scanner(System.in); 
//Number
int decimal = 148;
//integer array for storing octal digits
int octal[] = new int[20];
int i = 0; 
//writing logic for the conversion 
while(decimal > 0)
{ 
int r = decimal % 8;
octal[i++] = r;
decimal = decimal/8;
}
//printing result
System.out.print("Octal number : ");
for(int j = i-1 ; j >= 0 ; j--)
System.out.print(octal[j]);
//closing scanner class(not compulsory, but good practice)
sc.close();
}
}

Find More Solutions at: JAVA Program for Decimal to Octal Conversion

Program in Python

decimal = 148
octal = []

while decimal > 0:
r = decimal % 8
octal.append(r)
decimal = decimal // 8

for i in reversed(octal):
print(i, end="")

Find More Solutions at Python Program for Decimal to Octal Conversion

Question 5: Write a Program to Convert Decimal Number to Hexadecimal Number.

Program in C

Program in C++

Program in JAVA

Program in Python

Program in C

#include <stdio.h>

void convert (int num)
{
// creating a char array to store hexadecimal equivalent
char hexa[100];

// using i to store hexadecimal bit at given array position
int i = 0;
while (num != 0)
{
int rem = 0;


rem = num % 16;

// check if rem < 10 : Digits : 0 - 9
// ascii 0 : 48
if (rem < 10) { hexa[i] = rem + 48; i++; } 
// else positional values : A - F 
// rem value will be > 10, adding 55 will result : A - F 
// ascii A : 65, B : 66 ..... F : 70 
else
{
hexa[i] = rem + 55;
i++;
}
num = num / 16;
}
// printing hexadecimal array in reverse order
printf ("Hexadecimal:");
for (int j = i- 1; j >= 0; j--)
printf ("%c" , hexa[j]);
}

int main ()
{
int decimal = 1457;
convert (decimal);
return 0;
}

Find More Solutions at: C Program for Decimal to Hexadecimal Conversion

Program in C++

#include<iostream>
using namespace std;

void getHexadecimal(int decimal)
{
// creating a char array to store hexadecimal equivalent
char result[100];

// pos keep index track & is used to place value in result[] array
int pos = 0;
while (decimal != 0) {
int rem = 0;


rem = decimal % 16;

// Whenever rem < 10 : we will have [0 - 9] as values in place
// Note ASCII of 0 is 48
if (rem < 10) 
{ 
result[pos] = rem + 48; 
pos++; 
}

// else whenever remainder >= 10 we will have [A - F]
// rem value will be > 10, adding 55 will result : A - F
// Note: ASCII A -> 65, B -> 66 ......... F -> 70
else {
result[pos] = rem + 55;
pos++;
}

decimal = decimal / 16;
}

// to get result we need to read the array in opposite fashion
cout << "Hexadecimal Value: "; 
for (int j = pos - 1; j >= 0; j--)
cout << result[j];
}

int main()
{
int decimal;

cout << "Decimal Value: "; cin >> decimal;

getHexadecimal(decimal);

return 0;
}

Find More Solutions at C++ Program for Decimal to Hexadecimal Conversion

Program in JAVA

public class Main
{
public static void main (String[]args)
{
int decimal = 1457;
convert (decimal);
}

static void convert (int num)
{
// creating a char array to store hexadecimal equivalent
char[] hexa= new char[100];

// using i to store hexadecimal bit at given array position
int i = 0;
while (num != 0)
{
int rem = 0;


rem = num % 16;

// check if rem < 10 : Digits : 0 - 9
// ascii 0 : 48
if (rem < 10)
{
hexa[i] = (char)(rem + 48);
i++;
}
// else positional values : A - F 
// rem value will be > 10, adding 55 will result : A - F 
// ascii A : 65, B : 66 ..... F : 70 
else
{
hexa[i] = (char)(rem + 55);
i++;
}
num = num / 16;
}
// printing hexadecimal array in reverse order
System.out.println("Hexadecimal:");
for (int j = i - 1; j >= 0; j--)
System.out.print(hexa[j]); 
}

}

Find More Solutions at: JAVA Program for Decimal to Hexadecimal Conversion

Program in Python

def convert(num):
hexa = []

while num != 0:

rem = num % 16

if rem < 10:
hexa.append(chr(rem + 48))
else:
hexa.append(chr(rem + 55))
num = num // 16

hexa.reverse()
return ''.join(hexa)


decimal = 2545

print("Hexadecimal :", convert(decimal))

Find More Solutions at: Python Program to Decimal to Hexadecimal

Question 6: Write a Program to Convert Octal Number to Binary Number.

Program in C

Program in C++

Program in JAVA

Program in Python

Program in C

#include<stdio.h>
#include<math.h>

void convert(int octal)
{
int i = 0, decimal = 0;

//converting octal to decimal
while (octal!=0)
{
int digit = octal % 10;
decimal += digit * pow(8, i);

octal /= 10;
i++;
}

printf("Decimal Value: %d\n",decimal);

long long binary = 0;
int rem;
i = 1;

// converting decimal to binary here
while(decimal!=0)
{
rem = decimal % 2;
decimal /= 2;
binary += rem * i;

// moving to next position ex: units -> tens
i *= 10;
}

printf("Binary Value: %d",binary);
}

int main()
{
int octal;

printf("Octal Value: "); 
scanf("%d", &octal);

convert(octal);

return 0;
}

Find More Solutions at: C Program for Octal to Binary Conversion

Program in C++

#include<iostream>
#include<math.h>
using namespace std;

void convert(int octal)
{
int i = 0, decimal = 0;

//converting octal to decimal
while (octal!=0)
{
int digit = octal % 10;
decimal += digit * pow(8, i);

octal /= 10;
i++;
}

printf("Decimal Value: %d\n",decimal);

long long binary = 0;
int rem;
i = 1;

// converting decimal to binary here
while(decimal!=0)
{
rem = decimal % 2;
decimal /= 2;
binary += rem * i;

// moving to next position ex: units -> tens
i *= 10;
}

cout<<binary;
}

int main()
{
int octal;

cout<<"Octal Value: ";

cin>>octal;

convert(octal);

return 0;
}

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Program in JAVA

class Main
{
public static void main(String args[])
{
int octal = 12;

//Declaring variable to store decimal number
int decimal = 0;
//Declaring variable to use in power
int n = 0;

//writing logic for the octal to decimal conversion
while(octal > 0)
{
int temp = octal % 10;
decimal += temp * Math.pow(8, n);
octal = octal/10;
n++;
}

int binary[] = new int[20];
int i = 0;

//writing logic for the decimal to binary conversion
while(decimal > 0)
{
int r = decimal % 2;
binary[i++] = r;
decimal = decimal/2;
}

//printing result
System.out.print("Binary number : ");

for(int j = i-1 ; j >= 0 ; j--)
System.out.print(binary[j]+"");

}
}

Find More Solutions at JAVA Program for Octal to Binary Conversion

Program in Python

def convert(octal):
i = 0
decimal = 0
while octal != 0:
digit = octal % 10
decimal += digit * pow(8, i)
octal //= 10
i += 1
print("Decimal Value :", decimal)
binary = 0
rem = 0
i = 1

while decimal != 0:
rem = decimal % 2
decimal //= 2
binary += rem * i
i *= 10
print("Binary Value :", binary)


octal = int(input("Octal Value : "))
convert(octal)

Find More Solutions at Python Program for Octal to Binary Conversion

Question 7: Write a Program to Convert Octal Number to Decimal Number.

Program in C

Program in C++

Program in JAVA

Program in Python

Program in C

#include<stdio.h>
#include<math.h>

// function to convert octal to decimal
int convert(long long num)
{
int i = 0, decimal = 0;

// will only work for bases 2 - 10
int base = 8;

//converting octal to decimal
while (num!=0)
{
int digit = num % 10;
decimal += digit * pow(base, i);

num /= 10;
i++;
}
return decimal;
}

//main program
int main()
{
// long used rather than int to store large values
long long octal;

printf("Enter Octal Number: ");
scanf("%lld", &octal);

printf("Decimal: %lld", convert(octal));

return 0;
}

Find More Solutions at C Program for Octal to Decimal Conversion

Program in C++

#include<iostream>
#include<math.h>
using namespace std;

// function to convert octal to decimal
int getOctal(long long num)
{
int i = 0, decimal = 0;

// will only work for bases 2 - 10
int base = 8;

//converting octal to decimal
while (num!=0)
{
int digit = num % 10;
decimal += digit * pow(base, i);

num /= 10;
i++;
}
return decimal;
}

// main program
int main()
{
// long used rather than int to store large values
// Ex : int wont store 111111111111 (12 digits) as
// limit for int is 2147483647 (10 digits)
long long octal = 462;

cout << getOctal(octal); 

return 0;
}

Find More Solutions at C++ Program for Octal to Decimal Conversion

Program in JAVA

import java.util.Scanner;
public class Main
{
public static void main(String args[])
{ 
//scanner class object creation
Scanner sc = new Scanner(System.in); 
//input from user
System.out.print("Enter a octal number : ");
int octal = sc.nextInt();
//Declare variable to store decimal number 
int decimal = 0;
//Declare variable to use in power 
int n = 0; 
//writing logic for the conversion
while(octal > 0)
{
int temp = octal % 10; 
decimal += temp * Math.pow(8, n); 
octal = octal/10; 
n++; 
}
//printing result
System.out.println("Decimal number : "+decimal); 
//closing scanner class(not compulsory, but good practice)
sc.close(); 
}
}

Program in Python

def OctalToDecimal(num):
decimal_value = 0
base = 1

while num:
last_digit = num % 10
num = int(num / 10)
decimal_value += last_digit * base
base = base * 8
return decimal_value


octal = 512
print("The decimal value of",octal, " is",OctalToDecimal(octal))

Find More Solutions at Python Program for Octal to Decimal Conversion

Question 8: Write a Program to find out the Spiral Traversal of a Matrix.

Program in C

Program in C++

Program in JAVA

Program in C

#include <stdio.h>
#define r 4
#define c 4

int main()
{ 
int a[4][4] = { { 1, 2, 3, 4 },

{ 5, 6, 7, 8 },

{ 9, 10, 11, 12 },

{ 13, 14, 15, 16 } };

int i, left = 0, right = c-1, top = 0, bottom = r-1;

while (left <= right && top <= bottom) {

/* Print the first row
from the remaining rows */
for (i = left; i <= right; ++i) {
printf("%d ", a[top][i]);
}
top++;

/* Print the last column
from the remaining columns */
for (i = top; i <= bottom; ++i) {
printf("%d ", a[i][right]);
}
right--;

/* Print the last row from
the remaining rows */
if (top <= bottom) { for (i = right; i >= left; --i) {
printf("%d ", a[bottom][i]);
}
bottom--;
}

/* Print the first column from
the remaining columns */
if (left <= right) { for (i = bottom; i >= top; --i) {
printf("%d ", a[i][left]);
}
left++;
}
}

return 0;
}

Find More Solutions at C Program to Find the Spiral Traversal of a Matrix

Program in C++

#include <bits/stdc++.h>
#define r 4
#define c 4
using namespace std;

int main()
{ 
int a[4][4] = { { 1, 2, 3, 4 },

{ 5, 6, 7, 8 },

{ 9, 10, 11, 12 },

{ 13, 14, 15, 16 } };

int i, left = 0, right = c-1, top = 0, bottom = r-1;

while (left <= right && top <= bottom) {

/* Print the first row
from the remaining rows */
for (i = left; i <= right; ++i) {
cout<<a[top][i]<<" ";
}
top++;

/* Print the last column
from the remaining columns */
for (i = top; i <= bottom; ++i) {
cout<<a[i][right]<<" ";
}
right--;

/* Print the last row from
the remaining rows */
if (top <= bottom) { for (i = right; i >= left; --i) {
cout<<a[bottom][i]<<" ";
}
bottom--;
}

/* Print the first column from
the remaining columns */
if (left <= right) { for (i = bottom; i >= top; --i) {
cout<<a[i][left]<<" ";
}
left++;
}
}

return 0;
}

Find More Solutions at C++ Program for Spiral Traversal of a Matrix

Program in JAVA

import java.util.*;

class Main{
static int R = 4;
static int C = 4;

static void print(int arr[][], int i, int j, int m, int n)
{

if (i >= m || j >= n) {
return;
}

for (int p = i; p < n; p++) {
System.out.print(arr[i][p] + " ");
}

for (int p = i + 1; p < m; p++) {
System.out.print(arr[p][n - 1] + " ");
}

if ((m - 1) != i) {
for (int p = n - 2; p >= j; p--) {
System.out.print(arr[m - 1][p] + " ");
}
}

if ((n - 1) != j) {
for (int p = m - 2; p > i; p--) {
System.out.print(arr[p][j] + " ");
}
}
print(arr, i + 1, j + 1, m - 1, n - 1);
}


public static void main(String[] args)
{
int a[][] = { { 1, 2, 3, 4 },
{ 5, 6, 7, 8 },
{ 9, 10, 11, 12 },
{ 13, 14, 15, 16 } };


print(a, 0, 0, R, C);
}
}

Find More Solutions at JAVA Program for Spiral Traversal of a Matrix.

Question 9: Write a Program to Rotate a Matrix by 90 degrees.

Program in C

Program in C++

Program in JAVA

Program in C

#include <stdio.h>

void swap(int *x, int *y){
int temp = *x;
*x = *y;
*y= temp;
}
int main(){

int n=4;
int mat[4][4]= { { 1, 2, 3, 4 },{ 5, 6, 7, 8 },{ 9, 10, 11, 12 },{ 13, 14, 15, 16 } };

//Tranposing the matrix
for(int i=0; i<n; i++){
for(int j=i+1; j<n; j++)
swap(&mat[i][j], &mat[j][i]);
}

//Reversing each row of the matrix
for(int i=0; i<n; i++){
for(int j=0; j<n/2; j++){
swap(&mat[i][j], &mat[i][n-j-1]);
}
}

//Print the matrix
printf("Rotated Matrix :\n");
for(int i=0; i<n; i++){
for(int j=0; j<n; j++){
printf("%d ",mat[i][j]);
}
printf("\n");
}
}

Find More Solutions at C Program to rotate a matrix by 90 degrees.

Program in C++

#include<bits/stdc++.h>
using namespace std;
int main(){

int n=4;
int mat[n][n]= { { 1, 2, 3, 4 },{ 5, 6, 7, 8 },{ 9, 10, 11, 12 },{ 13, 14, 15, 16 } };

//Tranposing the matrix
for(int i=0; i<n; i++){
for(int j=i+1; j<n; j++)
swap(mat[i][j], mat[j][i]);
}

//Reversing each row of the matrix
for(int i=0; i<n; i++){
for(int j=0; j<n/2; j++){
swap(mat[i][j], mat[i][n-j-1]);
}
}

//Print the matrix
cout<<"Rotated Matrix :\n";
for(int i=0; i<n; i++){
for(int j=0; j<n; j++){
cout<<mat[i][j]<<" ";
}
cout<<endl;
}
}

Find More Solutions at C++ Program to Rotate a Matrix by 90 degrees.

Program in JAVA

import java.util.*;

class Main
{

static void reverseRows (int mat[][])
{
int n = mat.length;
for (int i = 0; i < mat.length; i++){
for (int j = 0; j < mat.length/ 2; j++){
int temp = mat[i][j];
mat[i][j] = mat[i][n - j - 1];
mat[i][n - j - 1] = temp;
}
}

}


static void transpose (int arr[][])
{
for (int i = 0; i < arr.length; i++)
for (int j = i; j < arr[0].length; j++){
int temp = arr[j][i];
arr[j][i] = arr[i][j];
arr[i][j] = temp;
}
}

static void printMatrix (int arr[][]){
for (int i = 0; i < arr.length; i++){
for (int j = 0; j < arr[0].length; j++)
System.out.print (arr[i][j] + " ");
System.out.println ("");
}
}

static void rotate90 (int arr[][])
{
transpose (arr);
reverseRows (arr);
}


public static void main (String[]args)
{
int arr[][] = { {1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12},
{13, 14, 15, 16}
};

rotate90 (arr);
printMatrix (arr);
}
}

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Question 10: Write a Program to Find a Specific Pair in a Matrix

Program in C

Program in JAVA

Program in Python

Program in C

#include <stdio.h>
#include <limits.h>
#define N 5

int findMaxValue(int mat[][N])
{
int maxValue = INT_MIN;

for (int a = 0; a < N - 1; a++)
for (int b = 0; b < N - 1; b++)
for (int d = a + 1; d < N; d++)
for (int e = b + 1; e < N; e++)
if (maxValue < (mat[d][e] - mat[a][b]))
maxValue = mat[d][e] - mat[a][b];

return maxValue;
}

int main()
{
int mat[N][N] = {
{ 1, 2, -1, -4, -20 },
{ -8, -3, 4, 2, 1 },
{ 3, 8, 6, 1, 3 },
{ -4, -1, 1, 7, -6 },
{ 0, -4, 10, -5, 1 }
};
printf("Maximum Value is %d", findMaxValue(mat));

return 0;
}

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Program in JAVA

import java.io.*;
import java.util.*;

class Main
{
static int findMaxValue(int N,int mat[][])
{
int maxValue = Integer.MIN_VALUE;

for (int a = 0; a < N - 1; a++)
for (int b = 0; b < N - 1; b++)
for (int d = a + 1; d < N; d++)
for (int e = b + 1; e < N; e++)
if (maxValue < (mat[d][e] - mat[a][b]))
maxValue = mat[d][e] - mat[a][b];

return maxValue;
}

public static void main (String[] args)
{
int N = 5;

int mat[][] = {
{ 1, 2, -1, -4, -20 },
{ -8, -3, 4, 2, 1 },
{ 3, 8, 6, 1, 3 },
{ -4, -1, 1, 7, -6 },
{ 0, -4, 10, -5, 1 }
};

System.out.print("Maximum Value is " + findMaxValue(N,mat));
}
}

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Program in Python

N = 5


def findMaxValue(mat):
maxValue = 0

for a in range(N - 1):
for b in range(N - 1):
for d in range(a + 1, N):
for e in range(b + 1, N):
if maxValue < (mat[d][e] - mat[a][b]):
maxValue = mat[d][e] - mat[a][b]
return maxValue


matrix = [[ 1, 2, -1, -4, -20],
[-8, -3, 4, 2, 1],
[ 3, 8, 6, 1, 3],
[-4, -1, 1, 7, -6],
[ 0, -4, 10, -5, 1]]

print("Maximum Value is", findMaxValue(matrix))

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3 comments on “Infosys Coding Interview Questions”

SHRADHANANDA
These questions are easy .please provide us more top questions for Infosys

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Preet
thankew so much

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Abhay V Deshpande
Post some difficult level programs…Thank you

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Infosys Coding Interview Questions