C语言程序设计c语言#c

Question

计算圆面积，怎么初始化变量r

Answer 1

望采纳

#include <stdio.h>
int main()
{
    int r;
    float area,pi = 3.14;
    printf("请输入半径：\n");
    scanf("%d",&r);
    area = pi * r * r;
    printf("面积是：%.2f",area);
    return 0;
}