Using gets() and puts()

/* 1304.c: Using gets() and puts() */
#include <stdio.h>

main()
{
    char str[80];
    int i, delt = 'a' - 'A';

    printf("Enter a string less than 80 characters:\n");
    gets( str );
    i = 0;
    while (str[i]){
    if ((str[i] >= 'a') && (str[i] <= 'z'))
    str[i] -= delt; /* convert to upper case */
    ++i;
    }
    printf("The entered string is (in uppercase):\n");
    puts( str );
    return 0;
}