Homework1-15

int main(){ //calculate the perimeter and area printf("insert a and b,divide them by space"); float a,b; scanf("%f %f",&a,&b); printf("the area is%f  and the perimemeter is%f",a*b,2*(a+b));}

int main(){//计算并联电阻printf("insert the R1 R2");float R1,R2;scanf("%f %f",&R1,&R2);printf("并联的电阻是：%f",R1*R2/(R1+R2));}

int main(){//摄氏温度转℉printf("insert the Celsuis：");float Fahr,Celsuis;scanf("%f",&Celsuis);Fahr=Celsuis*9.0/5.0+32.0;printf("华氏温度是：%f",Fahr);}

#include <stdio.h>#include <stdlib.h>#define pi 3.1415926int main(){//计算圆柱表面积printf("输入圆柱的半径r和高h:\n例如：3.5 9\nArea=274.889\n");float s,r,h;scanf("%f %f",&r,&h);s=r*r*2*pi+h*2*pi*r;printf("Area=%f",s);}