C++ Program for Decimal to Binary Conversion
Program for Decimal to binary Conversion in C++
In this post, we will learn how to write a code for Decimal to Binary Conversion in C++. We will look at different ways for coding Decimal to Binary in C++.
Various Methods discussed
- Method 1: Binary Bits stored in Array
- Method 2: Using mathematical operations to generate binary equivalent.
Method 1
C++ Code:
Run
#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;
}
Output
10101
Method 2
C++ Code:
Run
#include<iostream>
using namespace std;
void convertBinary(int num)
{
// long long used to store large binary values
long long binary = 0;
int rem, i = 1;
while(num!=0)
{
rem = num % 2;
num /= 2;
binary += rem * i;
// moving to next position ex: units -> tens
i *= 10;
}
cout << binary;
}
int main()
{
int decimal_num = 21;
convertBinary(decimal_num);
return 0;
}
Output
10101
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