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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. void encrypt(char *text, int shift) {
  5.     char *ptr = text;
  6.     while(*ptr != '\0') {
  7.         if(isalpha(*ptr)) {
  8.             char base = islower(*ptr) ? 'a' : 'A';
  9.             *ptr = (*ptr - base + shift) % 26 + base;
  10.         }
  11.         ptr++;
  12.     }
  13. }
  14.  
  15. int main() {
  16.     char text1[] = "hello world";
  17.     encrypt(text1, 3);
  18.     printf("Encrypted text: %s\n", text1);
  19.  
  20.     char text2[] = "abc xyz";
  21.     encrypt(text2, 5);
  22.     printf("Encrypted text: %s\n", text2);
  23.  
  24.     char text3[] = "abc xyz";
  25.     encrypt(text3, 5);
  26.     printf("Encrypted text: %s\n", text3);
  27.  
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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Encrypted text: khoor zruog
Encrypted text: fgh cde
Encrypted text: fgh cde
https://ideone.com/W74Uci
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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