[心得] 函數

[i4303348 (鮮橙柚)]

#include <stdio.h>
#include <stdlib.h>

double compute_area(int radius);

int main(void)
{   int r1,r2;
    double area,area1,area2;

    printf("請輸入大圓半徑:>");
    scanf("%d",&r1);
    area1=compute_area(r1);
    printf("請輸入小圓半徑:>");
    scanf("%d",&r2);
    area2=compute_area(r2);
    area=area1-area2;
    printf("甜甜圈面積為%8.2f\n",area);
    system("pause");
    return(0);
}

double compute_area(int radius)
{   double area;
    area=3.1416*radius*radius;
    return(area);
}

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