Question

How to swap the last two digits in int number in C++

Answer 1

#include <iostream>  
#include <sstream>  
  
int main() {  
    int n = 840172;  
      
    std::cout << n << "\n";  
      
    std::stringstream ss;  
    ss << n;  
      
    std::string s;  
    ss >> s;  
      
    char tmp = s[s.size() - 2];
    s[s.size() - 2] = s[s.size() - 1];
    s[s.size() - 1] = tmp;
      
    std::stringstream().swap(ss);
    ss << s;
      
    ss >> n;
        
    std::cout << n;  
      
    return 0;
}  
  
  
  
  
/*
run:
  
840172
840127
  
*/

 

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