C++ program to change all lower case letters into Uppercase

//Program to convert from lower case to upper case

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
char string[30];
int i,n=0;
cout<<"\nEnter the string : ";
gets(string);
cout<<"Before conversion : "<<string<<endl;
for(i=0;string[i]!='\0';i++)
    n++;
for(i=0;i<n;i++)
{
    if(string[i]>=97 && string[i]<=122)
    string[i]=string[i]-32;
}
cout<<"After conversion :"<<string<<endl;
getch();
}

OUTPUT