#include<stdio.h>
#include<stdlib.h>
struct rect{
int length,width;
};
int callarea(struct rect *pr);
int main(){
int area;
struct rect r1={20,18};
area=callarea(&r1);
printf("此矩形的長為%d, 寬為%d, 面積為%d\n",r1.length,r1.width,area);
system("pause");
return 0;
}
int callarea(struct rect *pr){
int area;
area=pr->length*pr->width;
return area;
}
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