expected expression before ‘int’

This error message typically occurs when there is a syntax error in the code. It usually means that there is a missing semicolon or an incorrect use of braces, brackets, or parentheses.

For example, if you have written:

int num
int main(){
    return 0;
}

The error message would be "expected expression before 'int'". This is because you forgot to add a semicolon after `int num`.

To fix this error, you simply need to add the missing semicolon:

int num;
int main(){
    return 0;
}