将三个数字从小到大排列

#include<stdio.h>
int main(){
    int a,b,c,m;
    scanf("%d %d %d",&a,&b,&c);
    if(a>b){m=a;a=b;b=m;
    }
    if(a>c){
        m=a;a=c;c=m;
    }    if(b>c){
        m=b;b=c;c=m;
    }
   if(a+b<=c){
        printf("不是三角形"); 
    }
    else if(a*a+b*b==c*c){
        printf("%d",a*b/2);
    }
    else printf("其他三角形");
    return 0; 
}