ตัวดำเนินการสัมพันธ์และตรรกะ

#include <stdio.h>
int main(void) {
    printf("3 < 5 = %d\n", 3 < 5);
    printf("3 > 5 = %d\n", 3 > 5);
    return 0;
}

#include <stdio.h>
int main(void) {
    int a = 4, b = 4;
    printf("a == b = %d\n", a == b);
    printf("a != b = %d\n", a != b);
    return 0;
}

#include <stdio.h>
int main(void) {
    int result = (10 > 2);
    printf("result = %d\n", result);
    return 0;
}

#include <stdio.h>
int main(void) {
    int age = 25;
    if (age > 18 && age < 65)
        printf("Working age\n");
    return 0;
}

#include <stdio.h>
int main(void) {
    int day = 6;
    if (day == 6 || day == 7)
        printf("Weekend\n");
    return 0;
}

#include <stdio.h>
int main(void) {
    int loggedIn = 0;
    if (!loggedIn)
        printf("Please log in\n");
    return 0;
}

#include <stdio.h>
int main(void) {
    int x = 0;
    if (x != 0 && 10 / x > 1)
        printf("safe\n");
    else
        printf("division skipped\n");
    return 0;
}

#include <stdio.h>
int main(void) {
    int score = 75;
    if (score >= 50 && score < 80)
        printf("Pass\n");
    return 0;
}

#include <stdio.h>
int main(void) {
    int a = 3, b = 5;
    printf("%d\n", !(a == b));
    return 0;
}

#include <stdio.h>
int main(void) {
    int x = 50;
    if (x > 1 && x < 10)
        printf("in range\n");
    else
        printf("out of range\n");
    return 0;
}

#include <stdio.h>
int main(void) {
    int n = -4;
    if (n > 0)
        printf("positive\n");
    else if (n < 0)
        printf("negative\n");
    else
        printf("zero\n");
    return 0;
}