Question

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

Answer 1

#include <iostream>  
#include <sstream>  
 
int main() {  
    int n = 810492;  
     
    std::cout << n << "\n";  
     
    std::stringstream ss;  
    ss << n;  
     
    std::string s;  
    ss >> s;  
     
    char tmp = s[0];
    s[0] = s[1];
    s[1] = tmp;
     
    std::stringstream().swap(ss);
    ss << s;
     
    ss >> n;
       
    std::cout << n;  
     
    return 0;
}  
 
 
 
 
/*
run:
 
810492
180492
 
*/

 

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