请问有什么逻辑性问题吗？

include
int main(int argc, char** argv){
double a, b,c;
double area,perimeter,s;
printf("Enter 3 sides of the triangle:");
scanf("%lf，%lf，%lf",&a,&b,&c);
if
(a+b>c||b+c>a||a+c>b)
s=(a+b+c)/2;
area= s*(s*(s-a)(s-b)(s-c));
perimeter=a+b+c;
printf("area=%.2f;perimeter=%.2f\n",area,perimter);
else

printf("These sides do not correspond to a valid trinangle\n");

return 0;

}

|| 改为 &&