Program to convert lower case to upper case letter in c++

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
void main()
{
char ch;
cout<<"enter lower case letter=";
ch=getche();
if(ch>=96&&ch<=122)
ch=ch-32;
cout<<"\nresult in upper case letter="<<ch;
getch();
}

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