C Programming Code Examples
C > Conversions Code Examples
Program to Convert a Decimal Number to Binary & Count the Number of 1s
/* Program to Convert a Decimal Number to Binary & Count the Number of 1s
This C Program converts a decimal number into binary & count the number of 1s. The program uses module operation and multiplication with base 2 operation for conversion. It also uses modulo operation to check for 1's and accordingly increments the count of 1s. */
/*
- C program to accept a decimal number and convert it to binary
- and count the number of 1's in the binary number
*/
#include <stdio.h>
void main()
{
long num, decimal_num, remainder, base = 1, binary = 0, number-of-1s = 0;
printf("Enter a decimal integer \n");
scanf("%ld", &num);
decimal_num = num;
while (num > 0)
{
remainder = num % 2;
/* To count no.of 1s */
if (remainder == 1)
{
number-of-1s++;
}
binary = binary + remainder * base;
num = num / 2;
base = base * 10;
}
printf("Input number is = %d\n", decimal_num);
printf("Its binary equivalent is = %ld\n", binary);
printf("No.of 1's in the binary number is = %d\n", number-of-1s);
}
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