Question

How to swap case of a given string in C++

Answer 1

#include <iostream>

void swap_case(char *s) {
    int i = 0;
 
    while(s[i] != '\0') {
        if (s[i] >= 'a' && s[i] <= 'z') {
            s[i] = s[i] - 32;
        }
        else if (s[i] >= 'A' && s[i] <= 'Z') {
            s[i] = s[i] + 32;
        }
 
        i++;
    }
}
 
 
int main()
{
    char s[] = "C++ Programming";
 
    swap_case(s);
 
    std::cout << s;
 
    return 0;
}
 
 
 
 
/*
run:
 
c++ pROGRAMMING
 
*/

 

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