检查是否所有变量都等于c ++中的相同值

What is the easiest way to compare multiple variable to see if they are all the same value? For example if var1 = 53 and I want to check if var2 or var3 is equal to var1 and each other? So far I have done this:

if(row1==row2==row3==row4==col1==col2==col3==col4==diag1==diag2)
    cout << "It is a magic square";
else
    cout << "Not a magic square";

However this doesn't seem to work. Thanks for you help.

解决方案

You can't chain == operators like that. You would need to write, e.g.

if (row1==row2 && row2==row3 && row3==row4 && ...)