我一个月前才开始学习这门 C++ 课程。现在我被分配编写一个程序来计算这个。我不知道我做错了什么。
#include <stdio.h>
#include <math.h>
float gatherl1();
float gatherl2();
float gatheran();
void values(float,float,float);
float findlength(float,float,float);
float findan2(float,float,float);
float findan3(float,float,float);
void name(float,float,float);
int main(void)
{
float length1,length2;
float length3;
float angle1,angle2,angle3;
length1 = gatherl1();
length2 = gatherl2();
angle1 = gatheran();
values(length1,length2,angle1);
length3 = findlength(length1,length2,angle1);
angle2 = findan2(length1,length2,length3);
angle3 = findan3(length1,length2,length3);
name(angle1,angle2,angle3);
}
float gatherl1()
{
float l1;
printf("Enter the length of one of the sides of any triangle\n");
scanf("%f",&l1);
return l1;
}
float gatherl2()
{
float l2;
printf("Enter the length of the other side\n");
scanf("%f",&l2);
return l2;
}
float gatheran()
{
float angle;
printf("Enter the angle between them.\n");
scanf("%f",&angle);
return angle;
}
void values(float l1, float l2, float angle)
{
printf("\n The two sides are %f and %f. The angle between them is %f \n",l1,l2,angle);
}
float findlength(float l1, float l2, float angle)
{
float l3,pyt,boy;
if (angle==90)
{
pyt = pow(l1,2) + pow(l2,2);
l3 = sqrt(pyt);
}
else
{
boy = pow(l1,2) + pow(l2,2) - 2*l1*l2*cos(angle);
l3 = sqrt(boy);
}
printf("\nthe third side is = %f",l3);
return l3;
}
float findan2(float l1, float l2, float l3)
{
float cosangle2,angle2;
cosangle2 = (pow(l2,2) + pow(l3,2) - pow(l1,2)) / (2*l2*l3);
angle2 = acos(cosangle2);
return angle2;
}
float findan3(float l1, float l2, float l3)
{
float cosangle3,angle3;
cosangle3 = (pow(l1,2) + pow(l3,2) - pow(l2,2)) / (2*l1*l3);
angle3 = acos(cosangle3);
return angle3;
}
void name(angle,angle2,angle3)
{
printf("\n\n\n the other two angles are %f and %f",angle2,angle3);
printf("\n\n\n The angle you put is %f",angle);
if(angle == 90)
{
printf("\n The triangle is a right triangle\n");
}
else if(angle < 90)
{
printf("\n The triangle is a acute triangle\n");
}
else
{
printf("\n The triangle is a obtuse triangle\n");
}
}
我以前从未使用过 cos 和 arccos 函数，所以我不确定这是否是原因。或功能，因为我也是新手。请帮我！！谢谢你。