输入一个圆半径r,当r>=0时,计算并输出圆的面积和周长,否则,输出提示信息。 #include ___ int main(void) { double r ,area , girth; printf("please input r:"); scanf("%lf",&r); if (r>=0) { area
printf("the result is %lf.\n",c);}} 答案 #include using namespace std;double p(double x){return 2*x*x*x-4*x*x+3*x-6;}int main(){double a,b;cin >> a >> b;double fa = p(a),fb = p(b),fm;do{fm = p((a+b)/2);if(fm==0) break;if(fm*fa 解析 暂无...