/* Program to input a temperature and print a warning if the number
   is negative. */

#include <stdio.h>

main () {
    float temperature;

    /* Print a prompt for the user */
    printf("Please enter the temperature in Kelvins: ");

    /* Input number and check. */
    scanf("%f", &temperature);
    if (temperature < 0.0) {
        printf("Temperatures can't be negative!\n");
    }

    /* (A touching farewell message) */
    printf("Temperature processed.\n");
}