無效菜單()
{
printf(" | ++++++ ++ 1圓形區域++++++++ | \ n ");
printf(" | ++++++++ ++ 2矩形區域++++++ | \ n ");
printf(" | ++++++ ++ 3平方面積++++++++ | \ n ");
printf(" | ++++++ ++ 4 ends ++++++++ | \ n ");
}
主()
{
雙r,a,b,pai=3.14,綿基;
int choice = 0;
while(1)
{
if(選擇==4)
打破;
menu();
Printf("請選擇1,2,3,4:");
scanf("%d ",& amp選擇);
開關(選擇)
{
案例1:
{
Printf("請輸入半徑r:");
scanf("%lf ",& ampr);
mianji = pai * r * r
Printf ("area is %lf\n ",mianji);
};打破;
案例二:
{
Printf("請輸入長度a:");
scanf("%lf ",& ampa);
Printf("請輸入寬度b:");
scanf("%lf ",& ampb);
面記= a * b;
Printf ("area is %lf\n ",mianji);
};打破;
案例三:
{
Printf("請輸入邊長a:");
scanf("%lf ",& ampa);
mianji = a * a
Printf ("area is %lf\n ",mianji);
};打破;
}
}
}