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#include <stdio.h>

/* Safe division — short-circuit prevents divide-by-zero */
double safe_div(int a, int b)
{
    return (b != 0) ? (double)a / b : 0.0;
}

int main(void)
{
    int x = 5, y = 10;

/* Relational operators */
    printf("x == y : %d
", x == y);   /* 0 */
    printf("x != y : %d
", x != y);   /* 1 */
    printf("x <  y : %d
", x <  y);   /* 1 */
    printf("x >  y : %d
", x >  y);   /* 0 */
    printf("x <= 5 : %d
", x <= 5);   /* 1 */
    printf("x >= 6 : %d
", x >= 6);   /* 0 */

/* Logical operators with short-circuit */
    int *ptr = NULL;
    if (ptr != NULL && *ptr > 0) {     /* safe — short-circuits */
        printf("ptr is valid and positive
");
    } else {
        printf("ptr is NULL — no dereference occurred
");
    }

printf("5 || expensive(): %d
", 1 || (printf("not reached
"), 0));

/* Ternary operator */
    int score = 72;
    const char *grade = (score >= 90) ? "A" :
                        (score >= 80) ? "B" :
                        (score >= 70) ? "C" : "F";
    printf("Score %d -> grade %s
", score, grade);

printf("safe_div(10, 0) = %.2f
", safe_div(10, 0));
    printf("safe_div(10, 3) = %.4f
", safe_div(10, 3));

return 0;
}