Header File Error.........

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Hello guys,

i wrote a few header files, but all of them give similiar errors. Can you help me ?

Here is the header file:

C++

#ifndef insertion_sort
#define insertion_sort
    void insertion_sort(int array[], int array_SIZE);

    void insertion_sort(int array[], int array_SIZE){
        int i, j, carry;
            for(i=1; i<array_size>< i++){
                carry=array[i];
                j=i;
                    while(j>0 && array[j-1]>carry){
                        array[j]=array[j-1];
                        j--;
                    }
                array[j]=carry;
            }
    }

#endif // insertion_sort

and there is the errors:

function prototype and function definitions are giving same errors.

expected unqualified-id before int;
expected ')' before 'int'

Posted 30-Dec-13 9:27am

Yiğit Yüksel

Updated 30-Dec-13 9:28am

Richard C Bishop

v2

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Graham Breach · Accepted Answer · 2013-12-30T10:19:00

Solution 1

You should not use the name of your function or class as the #define that wraps the header file. The line "#define insertion_sort" is telling the preprocessor to replace all the occurrences of "insertion_sort" with an empty string and causing the strange error messages.

Try using

C++

#ifndef insertion_sort_h
#define insertion_sort_h

instead, or if you're using Visual C++ you could use

C++

#pragma once

instead of the guard definition.

Posted 30-Dec-13 10:19am

Graham Breach

Comments

Ron Beyer 30-Dec-13 16:35pm

+5, good catch on the redefine and the function name being the same. Its a hard error to catch.

Albert Holguin 30-Dec-13 16:44pm

+5, I would go with the _h option... pragma comments aren't exactly cross compilation friendly