用c语言求圆的面积
http://zhidao.baidu.com/question/533778972.html?fr=iks&word=C%D3%EF%D1%D4%BC%C6%CB%E3%D4%B2%B5%C4%C3%E6%BB%FD%D2%AA%C7%F3%CA%E4%B3%F6%D7%D6%B7%FB%B5%C4%B3%A4%B6%C8%CE%AA14&ie=gbk ——百度知道
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答:define PI 3.14 void main(){ float r;double c;double s;printf("请输入半径的值:");scanf("%f",&r);s=PI*r*r