Question

I am new in C and apparently I’ve got some problems with understanding all the memory and pointer things.
So I have the following Java code:

public class Question_10
{
   public static void sortInt(int[] array)
   {
      int top = 0;
      while (top < array.length - 1)
      {
         if (array[top] < array[top + 1])
         {
            top++;
         }
         else
         {
            int temp = array[top];
            array[top] = array[top + 1];
            array[top + 1] = temp;
            if (top > 0)
            {
               top--;
            }
         }
         System.out.println(top);
      }
   }

   public static void main(String[] args)
   {
      int[] arr = {5, 6, 10, 1, 45, 3};

      sortInt(arr);
      System.out.println();
   }

}

Aaand, I’ve done the following:

#include <stdio.h>

void sortInt(int arrayInput[])
{
    int top = 0;
    int arrLen = sizeof(arrayInput)/(sizeof(int);
    while(top < arrLen - 1)
    {
        if(arrayInput[top] < arrayInput[top+1])
        {
            top++;
        }
        else
        {
            int temp = arrayInput[top];
            arrayInput[top] = arrayInput[top + 1];
            arrayInput[top + 1] = temp;
            if(top > 0)
            {
                top--;
            }
        }
        printf("%i", top);
    }
}
void main()
{

    int array[] = {5, 6, 10, 1, 45, 3};
    sortInt(array);
    return 0;
}

Of course I get a lot of errors:

$ gcc Question10.c
Question10.c: In function `sortInt':
Question10.c:6: error: parse error before ';' token
Question10.c: At top level:
Question10.c:16: error: `top' undeclared here (not in a function)
Question10.c:16: warning: data definition has no type or storage class
Question10.c:17: error: `temp' undeclared here (not in a function)
Question10.c:17: warning: data definition has no type or storage class
Question10.c:18: error: parse error before "if"
Question10.c:23: error: parse error before string constant
Question10.c:23: error: conflicting types for 'printf'
Question10.c:23: note: a parameter list with an ellipsis can't match an empty parameter name list declaration
Question10.c:23: error: conflicting types for 'printf'
Question10.c:23: note: a parameter list with an ellipsis can't match an empty parameter name list declaration
Question10.c:23: warning: data definition has no type or storage class
Question10.c: In function `main':
Question10.c:30: warning: `return' with a value, in function returning void
Question10.c:27: warning: return type of 'main' is not `int'
Question10.c:31:2: warning: no newline at end of file
Question10.c: At top level:
Question10.c:16: error: storage size of `arrayInput' isn't known
Question10.c:17: error: storage size of `arrayInput' isn't known

Maybe you could give me any suggestion on what’s wrong and some general guidance will be helpful, because I am really getting lost in these “object” things in C.

Answer 1

There is a syntax error on this line:

int arrLen = sizeof(arrayInput)/(sizeof(int);

Try instead with:
int arrLen = sizeof(arrayInput)/sizeof(int);

If you start by fixing that then you might solve some of the other problems you have. If not, take one at a time.

Another error that I can see is that you declared your main method as void main() and you call return 0;. According to the C standard, main() method should return int, so change the declaration.