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  1. #include <string>
  2. #include <stdexcept>
  3. #include <cassert>
  4.  
  5. bool startsWith(const std::string &str,
  6.                 const std::string &prefix,
  7.                 std::size_t index = 0) {
  8.   return (str.substr(index, prefix.length()) == prefix);
  9. }
  10.  
  11. int main() {
  12.   std::string str = "kobyla ma maly bok";
  13.  
  14.   assert(startsWith(str, "kobyla") == true);
  15.   assert(startsWith(str, "ma") == false);
  16.   assert(startsWith(str, "ma", 7) == true);
  17.  
  18.   assert(startsWith(str, "kobyla ma maly bok i co z tego") == false);
  19.  
  20.   bool exceptionThrown = false;
  21.  
  22.   try {
  23.   	startsWith(str, "hehe", 9999);
  24.   } catch (std::out_of_range &) {
  25.   	exceptionThrown = true; 
  26.   }
  27.  
  28.   assert(exceptionThrown == true);
  29.  
  30.   return 0;
  31. }
Success #stdin #stdout 0s 3468KB
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https://ideone.com/3TpuIK
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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