C Program to calculate the 2’s complement of a binary number. 2’s complement of a number is obtained by scanning it from right to left and complementing all the bits after the first appearance of a 1. Thus 2’s complement of 11100 is 00100. Read more about C Programming Language .

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#include <stdio.h>
#include<conio.h>

void complement (char *a);
void main()
{
 char a[16];
 int i;
 clrscr();
 printf("Enter the binary number");
 gets(a);
 for(i=0;a[i]!='