愛學習

/*C語言 指標函數計算矩形*/
#include<stdio.h>
#include<stdlib.h>

void function(int, int, int *, int *);
//宣告函數function()接收四個引值

int main(void)
{
    int length = 3, width = 4;
    int area = 0, perimeter = 0;

    printf("計算前length = %d, width = %d, area = %d, perimeter = %d\n",
        length, width, area, perimeter);

    function(length, width, &area, &perimeter);

    printf("計算後length = %d, width = %d, area = %d, perimeter = %d\n",
        length, width, area, perimeter);

    system("pause");
    return 0;
}

void function(int length, int width, int *area, int *perimeter)
{
    *area = length * width;
    //計算面積
    *perimeter = 2 * length + 2 * width;
    //計算周長
}

結果為：