题目

编写程序,提示用户输入三角形的三条边长,判断该三角形是否为直角三角形,若是则输出结果以及三角形面积.

提问时间：2021-03-16

答案

#include
void main(void)
{
int a,b,c;
double S;
int TRUE = 0;
printf("Enter three numbers for sides of a triangle:");
scanf("%d %d %d",&a,&b,&c);
if(a * a + b * b == c * c)
{
TRUE = 1;
S = a * b / 2;
}
if(b * b + c * c == a * a)
{
TRUE = 1;
S = b * c / 2;
}
if(c * c + a * a == b * b)
{
TRUE = 1;
S = c * a / 2;
}
if(TRUE == 1)
{
printf(" It is a right angle triangle. ");
printf("And the area of the triangle is %lf. ",S);
}
}