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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. char *remove_substring(char *s, int p, int n) {
  6.     // You need to do some checking before calling malloc
  7.     if (n == 0) return s;
  8.     size_t len = strlen(s);
  9.     if (n < 0 || p < 0 || p+n > len) return NULL;
  10.     size_t rlen = len-n+1;
  11.     char *res = malloc(rlen);
  12.     if (res == NULL) return NULL;
  13.     char *pt = res;
  14.     // Now let's use the two familiar loops,
  15.     // except printf("%c"...) will be replaced with *p++ = ...
  16.     for (int i = 0; i < p; i++) {
  17.         *pt++ = s[i];
  18.     }
  19.     for (int i = p+n; i < strlen(s); i++) {
  20.         *pt++ = s[i];
  21.     }
  22.     *pt = '\0';
  23.     return res;
  24. }
  25.  
  26. int main(void) {
  27.     char *s = remove_substring("abcdefghi",4,3);
  28.     printf("%s\n", s);
  29.     free(s);
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0s 2380KB
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Standard input is empty
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abcdhi
https://ideone.com/Qubpup
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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