题解 | #牛牛的圆#
牛牛的圆
http://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
int main()
{
double r;
scanf("%lf",&r);
double sqrt = r*r*3.14;
printf("%.2lf",sqrt);
return 0;
}
牛牛的圆
http://www.nowcoder.com/practice/75a202e826d048a39824ec694b5ce7e3
int main()
{
double r;
scanf("%lf",&r);
double sqrt = r*r*3.14;
printf("%.2lf",sqrt);
return 0;
}
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