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C言語の可変長引数を取る関数サンプル

Last updated at Posted at 2019-01-06

C言語のstdargが難しいので、自分なりのサンプルを作成してみました。man stdargでstdargライブラリのマニュアルも合わせてご確認ください。

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

int sum(int num1, ...) {
    va_list list;
    int n;
    int sum = num1;
    if (sum == 0) return 0;
    va_start(list, num1);
    while (1) {
        n = va_arg(list, int);
        if (n == 0) break;
        sum += n;
    }
    va_end(list);
    return sum;
}


int main() {
    int res = sum(1,2,3,4,5,6,7,8,9,10,0);
    printf("sum = %d\n", res);
    return 0;
}
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