C++ program to convert the upper to lower and lower to upper case letter

In this post, we will write a C++ program to convert the upper to lower and lower to upper case letters. user will enter an upper case letter and the program will print the lower case letter. also if the user enters the lower case letter then the program will print the upper case letter.

C++ program to convert lower to upper to lower case letters.

#include<iostream>
#include<conio.h>

int main(void)
{

    int n;
    char ch;

    std::cout<<"Press any letter either upper or lower case = ";
    std::cin >> ch;

    n = ch;

    if(n >= 65 && n <= 90)
    {
        n = n + 32;
        ch = n;

        std::cout<<"The lower case of your letter is = "<<ch;
    }
    else if(n >= 96 && n <= 122)
    {
        n = n-32;
        ch = n;

        std::cout<<"The upper case of your letter is = "<<ch;
    }
    else
        std::cout<<"You pressed wrong letter";

    return 0;
}

Output

Press any letter upper or lower case = D
The lower  case of your letter is = d

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