Lowercase to Uppercase Conversion 2891

#include<stdio.h>
int main()
{
  char str[20];
  int i;
  printf("Enter the String (Enter First Name) : ");
  scanf("%s",str);
  for(i=0;i<=strlen(str);i++)
  {
        if(str[i]>=97 && str[i]<=122)
        {
        str[i]=str[i]-32;
        }
  }
  printf("\nThe String in Uppercase = %s",str);
  getch();
}