CONVERSION FROM UPPERCASE TO LOWER CASE

#include<stdio.h>

#include<conio.h>

void main()

{

  char str[20];

  int i;

  clrscr();

  printf("Enter any string->");

  scanf("%s",str);

  printf("The string is->%s",str);

  for(i=0;i<=strlen(str);i++)

  {

            if(str[i]>=65&&str[i]<=90)

            str[i]=str[i]+32;

  }

  printf("\nThe string in uppercase is->%s",str);

  getch();

}