error 3a lvalue required as left operand of assignment

1//You cannot assign something to a numerical constant
2int num1,num2
3if (num1%num2=0) //error
4//You can't assign value of num1%num2 to 0
5//Instead you can check whether (num1%num2) is equal to 0 or not by:
6if (num1%num2==0) // no error