Question

How to convert a string lowercase characters to uppercase and uppercase to lowercase with C++

Answer 1

#include <bits/stdc++.h> 
 
using namespace std; 
 
string flip_characters(string s)  { 
   
    int len = s.length();
     
    string lower_s = "", upper_s = ""; 
   
    for (int i = 0; i < len; i++) { 
        if (s[i] >= 'A' && s[i] <= 'Z') {
            s[i] += 32;
        }
        else {
            if (s[i] >= 'a' && s[i] <= 'z') { 
                s[i] -= 32;
            }
        }
    } 
    return s;
} 
   
int main() 
{                       
    string s = "cPP pRograMMinG"; 
   
    s = flip_characters(s);
    
    cout << s;
   
    return 0; 
} 


 
 
/*
run:
 
Cpp PrOGRAmmINg
 
*/

 

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