float f1,f2,f3,l,fArea,fTemp;
 fArea=fTemp(fTemp-f1)(fTemp-f2)(fTemp-f3);


第一句我定义了这些。。可是编程后说我调用未定义函数。求教是怎么一会事。。整个编程是这样的。。

#include"stdio.h"
#include<math.h>
void main()
{  float f1,f2,f3,l,fArea,fTemp;
    printf("please input f1,f2 and f3:");
    scanf("%f%f%f",&f1,&f2,&f3);
    if((f1+f2)>f3&&(f1+f3)>f2&&(f2+f3)>f1)
        {printf("Can from triangle");
           l=f1+f2+f3;
           fTemp=l/2;
           fArea=fTemp(fTemp-f1)(fTemp-f2)(fTemp-f3);
           printf("%f\nThe Area is %f",l,sqrt(fArea)); }
           else
           printf("can't from triangle");



         getch();



}