Question

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

Answer 1

#include <iostream>  
#include <sstream>  

int main() {  
    int n = 840192;  
    
    std::cout << n << "\n";  
    
    std::stringstream ss;  
    ss << n;  
    
    std::string s;  
    ss >> s;  
    
    char tmp = s[0];
    s[0] = s[3];
    s[3] = tmp;
    
    std::stringstream ss1(s);  

    ss1 >> n;
      
    std::cout << n;  
    
    return 0;
}  




/*
run:

840192
140892

*/

 

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Answer 2

#include <iostream>  
#include <sstream>  

int main() {  
    int n = 840192;  
    
    std::cout << n << "\n";  
    
    std::stringstream ss;  
    ss << n;  
    
    std::string s;  
    ss >> s;  
    
    char tmp = s[0];
    s[0] = s[3];
    s[3] = tmp;
    
    std::stringstream().swap(ss);
    ss << s;
    
    ss >> n;
      
    std::cout << n;  
    
    return 0;
}  




/*
run:

840192
140892

*/

 

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