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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4.     void print_substring (char const * from, char const * to) {
  5.       fwrite(from, 1, to - from, stdout);
  6.       // One could check return value to ensure
  7.       // that all characters have been written,
  8.       // but then you also need to decide what
  9.       // to do in the case of an error.
  10.     }
  11.  
  12.  
  13. void print_all_substrings(char const * string) {
  14.   size_t const string_length = strlen(string);
  15.   for (size_t substring_length = 1;
  16.        substring_length <= string_length;
  17.        ++substring_length) {
  18.     char const * const last_begin = string + (string_length - substring_length);
  19.     char const * begin = string;
  20.     for (; begin != last_begin; ++begin) {
  21.       print_substring(begin, begin + substring_length);
  22.       printf(", ");
  23.     }
  24.     print_substring(last_begin, last_begin + substring_length);
  25.     printf("\n");
  26.   }
  27. }
  28.  
  29.  
  30. int main () {
  31.   print_all_substrings ("abcdefg"); puts("--");
  32.   print_all_substrings("a");puts("--");
  33.   print_all_substrings("");puts("--");
  34. }
Success #stdin #stdout 0s 9432KB
comments (?)
stdin 
Standard input is empty
stdout 
a, b, c, d, e, f, g
ab, bc, cd, de, ef, fg
abc, bcd, cde, def, efg
abcd, bcde, cdef, defg
abcde, bcdef, cdefg
abcdef, bcdefg
abcdefg
--
a
--
--
https://ideone.com/aA7Qg8
language:
C (clang 8.0)
created:
8 years ago
visibility:
secret

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