CS201 Introduction to Programming - Convert String into Lower case

////This program converts a string into an lowercase string 

#include <iostream>
#include <ctype.h>

using namespace std; //Allows computer to output data

//declaring the function prototype
void converToLowercase(char *);

main() //main function begins
{
char str[30] = "WELCOME to VIRTUAL UNIVERSIty";
//char fstr;

cout << "The string before conversion is:\t" << str;

converToLowercase(str);

cout << "\nThe string after conversion is:\t\t" << str;

}//end of main function

void converToLowercase(char *sptr)
{
while(*sptr!='\0')
{
if (isupper(*sptr))
{
*sptr=tolower(*sptr);

}
++sptr;
}
}