Example
Input
Input binary number: 01000011
Output
Ones complement: 10111100
Ones complement of a binary number is defined as value obtained by inverting all binary bits. It is the result of swapping all 1s to 0s and all 0s to 1s.
/**
* C program to find 1s complement of a binary number
*/
#include <stdio.h>
#define SIZE 8
int main()
{
char binary[SIZE + 1], onesComp[SIZE + 1];
int i, error=0;
printf("Enter %d bit binary value: ", SIZE);
/* Input binary string from user */
gets(binary);
/* Store all inverted bits of binary value to onesComp */
for(i=0; i<SIZE; i++)
{
if(binary[i] == '1')
{
onesComp[i] = '0';
}
else if(binary[i] == '0')
{
onesComp[i] = '1';
}
else
{
printf("Invalid Input");
error = 1;
/* Exits from loop */
break;
}
}
/* Marks the end of onesComp string */
onesComp[SIZE] = '\0';
/* Check if there are binary string contains no error */
if(error == 0)
{
printf("Original binary = %s\n", binary);
printf("Ones complement = %s", onesComp);
}
return 0;
}
/*
Output :
Enter any 8 bit binary value: 00001111
Original binary = 00001111
Ones complement = 11110000
*/