수다닷컴

질문 제목 : -1.#ind00 관련 질문코딩시 -1.#ind00가 뜹니다.질문 내용 :안녕하세요.2개의 변의 길이와 그 끼인각을 입력시키고 나머지 각들과 변의 길이를 cos법칙을 이용하여 구하는 코딩을 하던중에2개의 각이 acos()으로 계산되게 되엇는데 값이 -1.#ind00이 뜹니다.도와주세요 ㅠㅠ#includestdio.h
#includemath.hfloat l1, l2, a1;
double a2, a3;//gather the length of two sides of a triangle as well as the angle between them.
float inputs();//output the third length
float thirdside(float l1, float l2, float a1);//output the other two angles
double otherangle2(float l1, float l2, float l3);
double otherangle3(float l1, float l2, float l3);//output the type of triangle
void type(float a1, double a2, double a3);main()
{
float l3; //get input data
inputs(); //get the length of third side
l3 = thirdside(l1, l2, a1); //get the other two angles
a2 = otherangle2(l1, l2, l3);
a3 = otherangle3(l1, l2, l3); //get the type of the triangle
type(a1, a2, a3);
}///////////////////////////////////////////////////float inputs()
{
printf(enter the length of two sides and the angle between them.\n);
scanf(%f%f%f, &l1, &l2, &a1);
printf(inputs : l1=%f, l2=%f, a1=%f.\n, l1, l2, a1);
}//////////////////////////////////////////////////////////////////////////float thirdside(float l1, float l2, float a1)
{
float l3;
if(a1 == 90)
{
l3 = sqrt(l1*l1 + l2*l2);
printf(the length of the third side is %f\n, l3);
} else
{
l3 = sqrt(l1*l1 + l2*l2 -2*l1*l2*cos(a1));
printf(the length of the third side is %f\n, l3);
} return l3;
}///////////////////////////////////////////////////////////////////////////double otherangle2(float l1, float l2, float l3)
{
a2 = acos( (l2*l2 + l3*l3 - l1*l1) / 2*l2*l3 );

printf(the other two angle2 is %lf.\n, a2); return a2;
}/////////////////////////////////////////////////////////////////////////// double otherangle3(float l1, float l2, float l3)
{
a3 = acos( (l1*l1 + l3*l3 - l2*l2) / 2*l1*l3 ); printf(the other two angle3 is %lf.\n, a3);

return a3;
}/////////////////////////////////////////////////////////////////////////// void type(float a1, double a2, double a3)
{
if(a1 =if(a1 == 90 || a2 == 90 || a3 == 90)
{
printf(this triangle is right triangle.\n);
} else if(a1 90 && a2 90 && a3 90)
{
printf(this triangle is acute triangle.\n);
} else
{
printf(this triangle is obtuse triangle.\n);
}
}감사합니다!

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