#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<math.h>
#include<Windows.h> //=清屏
#define pi 3.1415926 //定义圆周率
int main()
{
int i, j;
double a, b;
while (1)
{
printf("正弦函数请输入‘1’，余弦函数请输入‘2’\n");
scanf("%d", &i);
if (i == 1)
{
printf("请输入度数：");
scanf("%d", &j);
b = j * pi/180;
a = sin(b);
system("cls");
printf("正弦函数值为：%lf\n", a);
return 0;
}
else if (i == 2)
{
printf("请输入度数：");
scanf("%d", &j);
b = j * pi/180;
a = cos(b);
system("cls");
printf("余弦函数值为：%lf\n", a);
return ;
}
else
{
system("cls");
printf("请重新输入！\n");
}
}
}
标签：pi,函数,scanf,system,余弦,printf,include,cls From： https://blog.51cto.com/u_16073189/6235394