c - error C2143: syntax error : missing ';' before 'type'

Question

I am new to programming C.. please tell me what is wrong with this program, and why I am getting this error: error C2143: syntax error : missing ';' before 'type'....

extern void func();

int main(int argc, char ** argv){
    func();
    int i=1;
    for(;i<=5; i++) {
        register int number = 7;
        printf("number is %d
", number++);
    }
    getch();
}

Answer 1

Visual Studio only supports C89. That means that all of your variables must be declared before anything else at the top of a function.

EDIT: @KeithThompson prodded me to add a more technically accurate description (and really just correct where mine is not in one regard). All declarations (of variables or of anything else) must precede all statements within a block.