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Write C++ Program to Convert String to Upper Case, Lower Case and Toggle Case

// CPP Program to Convert String to Upper Case, Lower Case and Toggle Case

#include <iostream>
#include <string.h>

using namespace std;

int main()
{
	char S[] = "Hello and Welcome To Codecrucks", c;

	int i=0;
	cout << "Original String :--> " << S;

	cout << "\n\nUpper Case :--> ";
	while(S[i] != '\0')     //TO CONVERT INTO THE UPPER CASE
	{
	    if(S[i] >= 'a' && S[i] <= 'z')
	    {
                c = S[i] - 32;
                cout << c;
	    }
           else
               cout << S[i];
	    i++;
	}


	i = 0;
	cout << "\nLower Case :--> ";
	while(S[i] != '\0')     //TO CONVERT INTO THE UPPER CASE
	{
	    if(S[i] >= 'A' && S[i] <= 'Z')
            {
                c = S[i] + 32;
                cout << c;
            }
            else
                cout << S[i];
	    i++;
	}


        i = 0;
	printf("\nToggle Case :--> ");
	while(S[i] != '\0')     //TO CONVERT INTO THE UPPER CASE
	{
	    if(S[i] >= 'A' && S[i] <= 'Z')
            {
                c = S[i] + 32;
                cout << c;
            }
            else if(S[i] >= 'a' && S[i] <= 'z')
            {
                c = S[i] - 32;
                cout << c;
            }
            else
                printf("%c", S[i]);
	    i++;
	}
	return 0;
}

Output:

Original String :--> Hello and Welcome To Codecrucks

Upper Case :--> HELLO AND WELCOME TO CODECRUCKS
Lower Case :--> hello and welcome to codecrucks
Toggle Case :--> hELLO AND wELCOME tO cODECRUCKS