function calling inside if condition

Question

#include <iostream>

using namespace std;

class Box {
public:
// Constructor definition
Box(double l = 2.0, double b = 2.0, double h = 2.0) {
cout <<"Constructor called." << endl;
length = l;
breadth = b;
height = h;
}
double Volume() {
return length * breadth * height;
}
int compare(Box box1) {

Box temp;
if(temp.Volume()>box1.Volume()) ///*** if(temp.Volume();>box1.Volume();)//with semicolon its not working why ???
{
return 1;
}
else
return 0;
}

private:
double length; // Length of a box
double breadth; // Breadth of a box
double height; // Height of a box
};

int main(void) {
Box Box1(3.3, 1.2, 1.5); // Declare box1
Box Box2(8.5, 6.0, 2.0); // Declare box2

if(Box1.compare(Box2)) {
cout << "Box2 is smaller than Box1" <<endl;
} else {
cout << "Box2 is equal to or larger than Box1" <<endl;
}

return 0;
}

Answer 1

If "statement" get an "expression" like condition

Read here http://www.informit.com/articles/article.aspx?p=2472079&seqNum=4

Answer 2

Because semicolon its not allowed here

P.S. Post your not-short code like link to save code in 'Code Playground' section

Answer 3

KrOW
in fuction calling we have to put semicolon at the end