C language implements inputting the radius of a circle to calculate the area of ​​the circle

Formula used:

Perimeter formula: C=2πr

Area formula: S=πr²

Specific code:

#include<stdio.h>
int main()
{
    float r,PI;
    PI = 3.14159;
    printf("请输入圆的半径：\n");
    scanf("%f", &r);
    printf("圆的周长为%.7f\n圆的面积为%.7f\n", 2 * PI*r, PI*r*r);
}

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