Introduction - If you have any usage issues, please Google them yourself
#include <stdio.h>
#include <math.h>
void main()
{
int a,b,c
double p,s
printf("请输入三角形的三边长：")
scanf(" d, d, d",&a,&b,&c)
if ((a+b>c&&a-b<c)==1)
{
p=(a+b+c)/2
s=sqrt(p*(p-a)*(p-b)*(p-c))
}
else
{
printf("三条边不能围成三角形\n")
return 0
}
printf("三角形面积是: f\n",s)
}