WAP to find one's complement of a binary number

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Write a C program to read binary number from user and find one's complement of binary number using loop. How to find 1's complement of a binary number in C programming. Logic to find ones complement of binary number in C program.
Example
Input
Input binary number: 01000011
Output
Ones complement: 10111100
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 1's to 0's and all 0's to 1's.
Logic to find ones complement
Below is the step by step logic to find ones complement of binary number.
1.            Read a binary string from user. Store it in some variable say binary.
2.            Run a loop from 1 to length of binary string, incrementing 1 in each iteration. The loop structure should look like for(i=0; i<SIZE; i++) (where SIZE is the length of binary digit).
3.            Inside the loop there can be two cases -
Case I: Print 0 for each 1 binary bit i.e. if binary[i] == '1' then, print 0.
Case II: Print 1 for each 0 binary bit i.e. if binary[i] == '0' then, print 1.
Program to find ones complement
/**
 * C program to find 1's 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);
   
    // Read 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';

    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 = 111100

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