Question

How to extract substring from a string in C++

Answer 1

#include <iostream>
#include <string>

int main() {
  std::string str = "C++ is a general-purpose programming language";

  auto start = 7;
  auto end = 16;
  
  // string substr (size_t pos = 0, size_t len = npos) const;
  
  auto sub = str.substr(start, end - start);
  
  std::cout << sub;
}




/*
run:

a general

*/

 

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Answer 2

#include <iostream>
#include <string>

int main() {
  std::string str = "C++ is a general-purpose programming language";

  auto start = 7;
  auto len = 9;
  
  // string substr (size_t pos = 0, size_t len = npos) const;
  
  auto sub = str.substr(start, len);
  
  std::cout << sub;
}




/*
run:

a general

*/

 

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