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  1. #include <stdio.h>
  2.  
  3. int find(char *string, char *substring) {
  4.     int i, j;
  5.  
  6.     for (i = 0; string[i] != '\0'; i++) {
  7.         for (j = 0; substring[j] != '\0' && string[i + j] == substring[j]; j++);
  8.         if (substring[j] == '\0') {
  9.             return i; // substring found at index i
  10.         }
  11.     }
  12.  
  13.     return -1; // substring not found
  14. }
  15.  
  16. int main() {
  17.     char string[] = "Hello, World!";
  18.     char substring[] = "World";
  19.     int index = find(string, substring);
  20.     if (index != -1) {
  21.         printf("Substring found at index: %d\n", index);
  22.     } else {
  23.         printf("Substring not found\n");
  24.     }
  25.     return 0;
  26. }
Success #stdin #stdout 0s 5304KB
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stdin
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Standard input is empty
stdout
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Substring found at index: 7
https://ideone.com/Ld9hmX
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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