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  1. // gcc -std=c99
  2. #include <stdbool.h>
  3. #include <stdio.h>
  4. #include <string.h>
  5.  
  6. static int
  7. count_substr(const char *str, const char* substr, bool overlap) {
  8.   if (strlen(substr) == 0) return -1;
  9.  
  10.   int count = 0;
  11.   int increment = overlap ? 1 : strlen(substr);
  12.   for (char* s = (char*)str; (s = strstr(s, substr)); s += increment)
  13.     ++count;
  14.   return count;
  15. }
  16.  
  17. int main() {
  18.   char *substrs[] = {"a", "aa", "aaa", "b", "", NULL };
  19.  
  20.   for (char** s = substrs; *s != NULL; ++s)
  21.     printf("'%s' ->  %d, no overlap: %d\n", *s, count_substr("aaaaa", *s, true),
  22. 	   count_substr("aaaaa", *s, false));
  23. }
  24.  
Success #stdin #stdout 0.02s 1720KB
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stdin
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Standard input is empty
stdout
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'a' ->  5, no overlap: 5
'aa' ->  4, no overlap: 2
'aaa' ->  3, no overlap: 1
'b' ->  0, no overlap: 0
'' ->  -1, no overlap: -1
https://ideone.com/TVkGM
language:
C99 (gcc 8.3)
created:
12 years ago
visibility:
secret

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