C Programming Code Examples
C > For Loops and While Loops Code Examples
C program to find ones complement of a binary number
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/* C program to find ones complement of a binary number
Write a C program to input binary number from user and find ones complement of binary number using loop. How to find 1s complement of a binary number in C programming.
What is Ones complement?
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.
01101110 >> 10010001
Logic to find ones complement of a number
Input a binary string from user. Store it in a variable say binary.
Run a loop from 1 to length of binary string, increment 1 in each iteration. The loop structure should look like for(j=0; j<SIZE; j++) (where SIZE is the length of binary digit).
Inside loop there are two possibilities -
Print 0 for each 1 binary bit i.e. if(binary[j] == '1').
Print 1 for each 0 binary bit i.e. if(binary[j] == '0'). */
#include <stdio.h>
#define SIZE 8
int main()
{
char binary[SIZE + 1], onesComp[SIZE + 1];
int j, 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(j=0; j<SIZE; j++)
{
if(binary[j] == '1')
{
onesComp[j] = '0';
}
else if(binary[j] == '0')
{
onesComp[j] = '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;
}
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