TCS Ninja Coding Questions and Answers

Extra Questions

Question 0

Find the nth term of the series.

1,1,2,3,4,9,8,27,16,81,32,243,….

#include<stdio.h>

#include<math.h>

int three(n)

{

int x,i;

for(i=0;i<100;i++)

{

x=pow(3,i);

if(i==n)

printf("%d",x);

}

}




int two(n)

{

int x,i;

for(i=0;i<100;i++)

{

x=pow(2,i);

if(i==n)

printf("%d",x);

}

}




int main()

{

int n;

scanf("%d",&n);

if(n%2==0)

three(n/2);

else 

two(n/2+1);

}

Question 1

Consider the below series:
1,2,1,3,2,5,3,7,5,11,8,13,13,17,

This series is a mixture of 2 series fail the odd terms in this series form a Fibonacci series and all the even terms are the prime numbers in ascending order

Write a program to find the Nth term in this series

The value N in a positive integer that should be read from mm. The Nth term that is calculated by the program should be written to STDOUT Otherthan the value of Nth term , no other characters / string or message should be written to STDOUT.

For example, when N:14, the 14th term in the series is 17 So only the value 17 should be printed to STDOUT

Solution –

#include

void fibo(int);

void prime(int);

main()

{

int n,e;

scanf("%d",&n);

e=n/2;

if(n%2==0)

prime(e);

else

fibo(e+1);

}

void prime(int n)

{

int i,j,no,flag=0,count=0;

  for(i=1;i<=100;i++)

   {

flag=0;

       for(j=2;j<=i/2;j++)

       {

if(i%j==0)

flag=0;

else

flag=1;

         }

   if(flag==1)

    count++;

    if(count==n)

        {

            printf("%d\n",i);

            break;

        }

    }

    

}

void fibo(int n)

{

  int n0=0,n1=1,n2,i;

for(i=3;i<=n;i++)

{

    n2=n0+n1;

    n0=n1;

    n1=n2;

}

printf("%d",n2);

}

Question 2

Here is the program for gcd of two numbers using command line arguments check other sections for TCS on our website.

#include

int main(int a,char *b[]) 

{

 int num1,num2,min,i,gcd=1;

if(a!=3){ 

printf("Enter two argument\n");

 exit(1); 

} 

num1=atoi(b[1]);

num2=atoi(b[2]); 

min=(no1<no2)?no1:no2;

for(i=1;i<=min;i++) {

if((num1%i)==0 && (num2%i)==0) 

gcd=i; 

} 

printf("GCD of two number %d",gcd); 

return 0; 

}

Question 3

Binary to Decimal Conversion

#include
#include
int main(int argc, char *argv[])
{
if(argc==1)
{
printf("No Arguments ");
return 0;
}
else
{
int n;

n=atoi(argv[1]);
int binaryN[64];
int i=0;int j;
while(n>0)
{
//storing in binary array remainder of number
binaryN[i]=n%2;
n=n/2;
i++;
}
//printing reverse array
while(i)
{
printf("%d",binaryN[--i]);
}

return 0;
}
}

Question 4

Armstrong Number

#include
#include

int main(int argc,char *argv[])
{
int Given_number= atoi(argv[1]);
int num;
for(num=1; num<=Given_number; num++)
{
int a=num;
int s=0;
int r=0;

while(a>0)
{
s=a%10;
r=r+(s*s*s);
a=a/10;
}
if(r==num)
printf(” %d isarmstrong no \n”, num);
}
}

Question 5

Write a C program to find the area of a circle with radius provided.
The value of radius positive integer passed to the program as the first command line parameter. Write the output to stdout formatted as a floating point number rounded to EXACTLY 2 decimal precision WITHOUT any other additional text.
Scientific format(such as 1.00E+5) should NOT be used while printing the output.
You may assume that the inputs will be such that the output will not exceed the largest possible real number that can be stored in a float type variable.

It is highly advisable to go through Command Line Arguments Post before even looking at the code. Please study this for TCS and come back to this post later.

#include
#include
int main(int argc, char * argv[])
{
 if(argc==1)
 {
 printf("No arguments");
 return 0;
 }
 else
 {
 int radius;
 float pi=3.14;
 float area;
 radius=atoi(argv[1]);
 area=pi*radius*radius;
 printf("%.2f",area);
 return 0;
 }
}

Write a C program to find the area of a circle with radius provided.
The value of radius positive integer passed to the program as the first command line parameter. Write the output to stdout formatted as a floating point number rounded to EXACTLY 2 decimal precision WITHOUT any other additional text.
Scientific format(such as 1.00E+5) should NOT be used while printing the output.

Question 6

Command Line Program to check if a year is Leap Year or Not

#include
void main(int argc,char *argv[])
{
	int n;
	n=atoi(argv[1]);
	if(n%4==0)
	{
		if(n%100==0)
		{
			if(n%400==0)
			
				printf("Leap Year");
				else
				printf("Not Leap Year");
		}
		else
		printf("Leap Year");
   }
    else
    printf("Not Leap Year");
	getch();	
	
}

Question 7

Fibonacci Series

#include
#include

int main(int argc, char *argv[])

{

int n, first = 0, second = 1, next, c;

n = atoi(argv[1]);

printf("These are %d values in Fibonacci series are by PrepInsta:-\n",n);

for ( c = 0 ; c < n ; c++ )

{

if ( c <= 1 )

next = c;

else

{

next = first + second;

first = second;

second = next;

}

printf("%d\n",next);

}

return 0;

}

Question 8

Ques. Write a C program to find the area of a triangle given the base and the corresponding height. The values base and height are both positive integers passed to the program as the first and second command line parameters respectively. Write the output to stdout formatted as a floating point number rounded to EXACTLY 2 decimal precision WITHOUT any other additional text. Scientific format(such as 1.00E+5) should NOT be used while printing the output. You may assume that the inputs will be such that the output will not exceed the largest possible real number that can be stored in a float type variable.

#include
#include 
int main(int argc, char *argv[])
{ 
if (argc < 3)// as number of arguments needed are 2 and 1 is default arg. 
{
printf(" Please provide values for both base and height \n");
return 0;
} 
else
{
int base = atoi(argv[1]);
int height = atoi(argv[2]);
float area = 0.5*base*height;
printf("%.2f",area);
return 0;
}
}

Question 9

Palindrome Number

#include 

int main(int argc, char *argv[])
{
            int num, reverse_num=0,remainder,temp;
            num = atol(argv[1]);
            temp=num;
            while(temp!=0)
   {
            remainder=temp%10;
            reverse_num=reverse_num*10+remainder;
            temp/=10;
   }
   if(reverse_num==num)
            printf("%d is a palindrome number",num);
   else
            printf("%d is not a palindrome number",num);
   return 0;
}

Question 10

Decimal to Binary

#include
#include
int main(int argc, char *argv[])
{
if(argc==1)
{
printf("No Arguments ");
return 0;
}
else
{
int n;

n=atoi(argv[1]);
int binaryN[64];
int i=0;int j;
while(n>0)
{
//storing in binary array remainder of number
binaryN[i]=n%2;
n=n/2;
i++;
}
//printing reverse array
while(i)
{
printf(“%d”,binaryN[–i]);
}

return 0;
}
}

Question 11

Binary to Octal

#include

void main(int argc,char *argv[])

{

ong int n,r,c,b=1,s=0;

n=atoi(argv[1]);

c=n;

while(c!=0)

{

r=c%10;

s=s+r*b;

c=c/10;

b=b*2;

}

printf(“%lo”,s);

getch();

}

Question 11

Decimal to Octal

#include

int main(int argc,char *argv[])

{

int n,s=0,b=1,r;

n=atoi(argv[1]);

int c=n;

while(c>0)

{

r=c%8;

s=s+r*b;

c=c/8;

b=b*10;

}

printf(“%d”,s);

getch();

}

Question 12

String Palindrome

#include

#include

void isPalindrome(char str[])

{

int l = 0;

int h = strlen(str) – 1;

while (h > l)

{

if (str[l++] != str[h–])

{

printf(“%s is Not Palindromen”, str);

return;

}

}

printf(“%s is palindromen”, str);

}

int main(int argc, char *argv[])

{

int i,k;

int strsize = 0;

for (i=1; i<argc; i++) {

strsize += strlen(argv[i]);

if (argc > i+1)

strsize++;

}

char *cmdstring;

cmdstring = malloc(strsize);

cmdstring[0] = ‘\0’;

for (k=1; k<argc; k++) {

strcat(cmdstring, argv[k]);

if (argc > k+1)

strcat(cmdstring, ” “);

}

isPalindrome(cmdstring);

}

Question 13

#include

#include

int main(int argc, char *argv[])

{

if(argc==1)

{

printf(“No Arguments”);

return 0;

}

else

{

int n,reverseNumber,temp,rem;

n=atoi(argv[1]);

temp=n;

reverseNumber=0;

while(temp)

{

rem=temp%10;

reverseNumber=reverseNumber*10+rem;

temp=temp/10;

}

printf(“%d”,reverseNumber);

return 0;

}

}

Question 14

Square Root without using Math.h

#include

#include

int main(int argc, char *argv[])

{

if(argc==1)

{

printf(“No arguments”);

return 0;

}

else

{

int n;

n=atoi(argv[1]);

float i=0.00;

while(i*i<=n)

{

i=i+0.001;

}

i=i-0.001;

printf(“%.2f”,i);

}

}

Question 15

Average of two numbers

#include

int main(int argc, char * argv[])

{

int sum = 0,i = 1,count = 0;

if(argc == 1)

{

printf(“Enter the number \n”);

exit(1);

}

count = argc – 1;

while (i <= count )

{

sum += atoi (argv[i]) ;

i++;

}

printf(“Avg of the numbers.%d\n”, sum/count);

}

Question 16

Greatest of two Numbers

#include

int main(int argc, char *argv[])

{

int c[10];

int i,temp,j,greatest;

j = 0;

for(i=1; i<argc; i++)

{

temp = atoi(argv[i]);

c[j] = temp;

j++;

}

greatest = c[0];

for (i = 0; i < 10; i++) {

if (c[i] > greatest) {

greatest = c[i];

}

}

printf(“Greatest of ten numbers is %d”, greatest);

return 0;

}

Question 17

Write a Program to print whether the given alphabet is vowel or consonant Solution:

#include

int main()

{

// Get the character char ch;

scanf(“%c”, &ch);

if(ch >= ‘A’ && ch <= ‘Z’)

{

ch = ‘a’ + (ch – ‘A’);

}

if(ch == ‘a’ || ch == ‘e’ || ch == ‘i’ || ch == ‘o’ || ch == ‘u’)

{

printf(“Vowel”);

}

else

{

printf(“Consonant”);

}
return 0;
}

Question 18

Write a program to Check whether a given number is a prime number or not Solution:

#include

#include

int main()

{

int n, i, flag = 0; //

printf(“Enter a positive integer: “);

scanf(“%d”,&n);

for(i=2; i<=sqrt(n); ++i) {

// condition for nonprime number

if(n%i==0)

{

flag=1;

break;

}

}

if (flag==0)

printf(“%d is a prime number.”,n);

else printf(“%d is not a prime number.”,n);

return 0;

}

Question 19

Write a program to change the case of the given alphabet and print. Solution:

#include int main() {

char c;

scanf(“%c”, &c);

// Upper to lower case

if(‘A’ <= c && c <= ‘Z’)

{

printf(“%c”, ‘a’ + (c – ‘A’));

}

// Lower to upper case if(‘a’ <= c && c <= ‘z’)

{ printf(“%c”, ‘A’ + (c – ‘a’));

}

return 0;

}

Question 20

Given an array and a number (say s), find whether any two elements in the array whose sum is “s”. Solution:

#include 
#include

void check_sum_and_diplay(int arr[], int size, int sum);

int main()

{

// Get the size of an array

int size;

scanf(“%d”, & size);

// Get the array elements

int arr[50], i;

for (i = 0; i < size; i++) {

scanf(“%d”, & arr[i]);

// Get the sum value (to check with an array elements)

int sum;
scanf(“%d”, & sum);

// Function call to check the sum of any two elements in an array equal to given sum

// and display the same

check_sum_and_diplay(arr, size, sum);

return 0;

}
}

void check_sum_and_diplay(int arr[], int size, int sum) {

int i, j;

for (i = 0; i < size – 1; i++)

{

{

if (sum == (arr[i] + arr[j]))

{

printf(“Perfect couple: %d %d”, arr[i], arr[j]);
exit(0);

}

}

printf(“No perfect couple found!”);
}

}

Question 21

Write a program to find the most occurring character in the string. Solution:

#include

#define MAX_SIZE 100

#define MAX_CHARS 26

int main()

{

int i;

//Get a sentence

char str[MAX_SIZE];

scanf(“%[^\n]s”, str);

// Init Freq stoting array

int freq[MAX_CHARS];

for(i=0; i<max_chars; i++)

{ freq[i]=0; }

//frequency of each character is counted

for(i=0; str[i]= !=’\0′;i++){

int isalphabet=0 , offset;

if(str[i]>= ‘a’ && str[i] <= ‘z’) {

isAlphabet = 1;

offset = str[i] – ‘a’;

}

else if(str[i] >= ‘A’ && str[i] <= ‘Z’)

{

isAlphabet = 1;

offset = str[i] – ‘A’;

}

if(isAlphabet == 1)

{

freq[offset] += 1;

}

}

// If two characters occurred the same number of time then

// print lowest ASCII value character. int max_index = 0; for(i=0; i<max_chars;i++)

{

if(freq[i] > freq[max_index])

{

max_index = i;

}

}

int max_repeated_char = ‘a’ + max_index;

printf(“%c”, max_repeated_char);

return 0;

}