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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     char bin[100];
  5.     printf("Enter a binary number: \n");
  6.     scanf("%s", bin);
  7.  
  8.     printf("1's Complement = ");
  9.     for (int i = 0; bin[i] != '\0'; i++) {
  10.         if (bin[i] == '0')
  11.             printf("1");
  12.         else if (bin[i] == '1')
  13.             printf("0");
  14.         else {
  15.             printf("\nInvalid binary digit!\n");
  16.             return 1;
  17.         }
  18.     }
  19.     printf("\n");
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
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1010
stdout
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Enter a binary number: 
1's Complement = 0101
https://ideone.com/p0G6OG
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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