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#include <stdio.h>
#include <stdbool.h>   /* bool, true, false (C99) */

const char *day_type(int day)
{
    switch (day) {
        case 1:  /* fall-through intentional */
        case 7:
            return "weekend";
        case 2: case 3: case 4: case 5: case 6:
            return "weekday";
        default:
            return "invalid";
    }
}

int main(void)
{
    /* if / else if / else */
    int temperature = 22;

if (temperature < 0) {
        printf("Freezing
");
    } else if (temperature < 10) {
        printf("Cold
");
    } else if (temperature < 25) {
        printf("Comfortable
");   /* this branch runs */
    } else {
        printf("Hot
");
    }

/* switch with fall-through demonstration */
    for (int d = 1; d <= 7; d++) {
        printf("Day %d is a %s
", d, day_type(d));
    }

/* bool type from <stdbool.h> */
    bool is_valid = (temperature >= -50 && temperature <= 60);
    if (is_valid) {
        printf("Temperature %d is within valid range
", temperature);
    }

return 0;
}