Thread: Mixed Letter Converter

i have writen a program that asks the user to input letters and it will change it to upper case. i have done this by using the common way of "toupper". i then got told that i cant have any letter manipulation or string commands to do this. can anyone help as to do this?

here is the code i had before...

Code:

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

using namespace std;

int main()

 {

  char input[25];
  int i = 0;

  cout <<"Please enter a word of mixed letters eg - MiXeD LeTtErS";
  cin >> input;
    for(;;)
     {
    
    if (input[i] == '\0') break;
    
    else
        {
        input[i] = toupper(input[i]);
        }
        
    i++;
 }
 
    cout <<input;

system("pause");
}