#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<math.h>
int main()
{
float a, b, c,p,q,s;
    scanf_s("%d%d%d", &a, &b, &c);
    if (a+b>c&&a+c>b&&b+c>a)
    {
        p = a + b + c;
        q = (a + b + c) / 2.0;
        s = sqrt(q*(q - a)*(q - b)*(q - c));
        printf("c=%d,s=%d",p,s);
        if (a == b == c) printf("正三角形");
        if (a == b || a == c || b == c) printf("等腰三角形");
        if (a*a + b*b == c*c || a*a + c*c == b*b || b*b + c*c == a*a)printf("直角三角形");
        else printf("一般三角形");
     }
    else printf("error!");
system("pause");
return 0;
}

哪里错了呢