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  1. #include <stdio.h>
  2. #include <string.h>
  3. void func(char *s)
  4. {
  5.     int n = strlen(s);
  6.     printf("input  = %s\n", s);
  7.     for (int i = 1; i <= n / 2; ++i)
  8.     {
  9.         if (n % i == 0)
  10.         {
  11.             if (strncmp(s, s + i, strlen(s + i)) == 0)
  12.             {
  13.                 printf("repeat = %.*s\n\n", i, s);
  14.                 return;
  15.             }
  16.         }
  17.     }
  18.     printf("repeat unit not found!\n\n");
  19.     return;
  20. }
  21. int main()
  22. {
  23.     func("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
  24.     func("123412312341231234123123412312341231234123");
  25.     func("oxoxoxoxoxoxoxoxxoxoxoxoxoxoxoxoxx");
  26.     func("axaxa"); // repeat = ax
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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input  = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
repeat = a

input  = 123412312341231234123123412312341231234123
repeat = 1234123

input  = oxoxoxoxoxoxoxoxxoxoxoxoxoxoxoxoxx
repeat = oxoxoxoxoxoxoxoxx

input  = axaxa
repeat unit not found!
https://ideone.com/gyK5k5
language:
C99 (gcc 8.3)
created:
10 years ago
visibility:
public

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