وحدات الماكرو stdarg

#include <stdio.h>

int main(void) {
    printf("%d %d %d\n", 1, 2, 3);
    printf("%s\n", "any count of args");
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

void demo(int count, ...) {
    printf("This function takes %d extra args\n", count);
}

int main(void) {
    demo(3, 10, 20, 30);
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

void show(int n, ...) {
    va_list args;
    va_start(args, n);
    va_end(args);
    printf("set up and cleaned up\n");
}

int main(void) {
    show(2, 5, 6);
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

void first(int count, ...) {
    va_list args;
    va_start(args, count);
    int value = va_arg(args, int);
    printf("first variadic arg = %d\n", value);
    va_end(args);
}

int main(void) {
    first(1, 99);
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

void three(int n, ...) {
    va_list args;
    va_start(args, n);
    int a = va_arg(args, int);
    int b = va_arg(args, int);
    int c = va_arg(args, int);
    printf("%d %d %d\n", a, b, c);
    va_end(args);
}

int main(void) {
    three(3, 7, 8, 9);
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

int add_two(int dummy, ...) {
    va_list args;
    va_start(args, dummy);
    int sum = va_arg(args, int) + va_arg(args, int);
    va_end(args);
    return sum;
}

int main(void) {
    printf("%d\n", add_two(0, 4, 6));
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

int sum(int count, ...) {
    va_list args;
    va_start(args, count);
    int total = 0;
    for (int i = 0; i < count; i++)
        total += va_arg(args, int);
    va_end(args);
    return total;
}

int main(void) {
    printf("%d\n", sum(4, 1, 2, 3, 4));
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

int sum_until_neg(int first, ...) {
    va_list args;
    va_start(args, first);
    int total = first, v;
    while ((v = va_arg(args, int)) != -1)
        total += v;
    va_end(args);
    return total;
}

int main(void) {
    printf("%d\n", sum_until_neg(10, 20, 30, -1));
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

void show_double(int n, ...) {
    va_list args;
    va_start(args, n);
    double d = va_arg(args, double);
    printf("%.2f\n", d);
    va_end(args);
}

int main(void) {
    show_double(1, 3.5f);
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

void twice(int n, ...) {
    va_list a, b;
    va_start(a, n);
    va_copy(b, a);
    printf("%d %d\n", va_arg(a, int), va_arg(b, int));
    va_end(a);
    va_end(b);
}

int main(void) {
    twice(1, 42);
    return 0;
}

#include <stdio.h>
#include <stdarg.h>

double average(int count, ...) {
    va_list args;
    va_start(args, count);
    double sum = 0;
    for (int i = 0; i < count; i++)
        sum += va_arg(args, double);
    va_end(args);
    return sum / count;
}

int main(void) {
    printf("%.2f\n", average(3, 2.0, 4.0, 6.0));
    return 0;
}