I am having a problem with returning the sorted value in the function sorted. I know it has something too do with fun pointers.

On a side note, how is a function suppost return something if it's declared as a void?

thanks a bunch!

 * helpers.c
 * Helper functions for Problem Set 3.

#include <cs50.h>
#include <math.h>
#include "helpers.h"
#include <stdio.h>

//Returns true if value is in array of n values, else false.

bool search(int value, int values[], int n)

// Sorts array of n values.

void sort(int values[], int n)
    int bubbled = true;
    int index = 0;
    int count = 1;

        count += 1;  //if values[index] is less then values[index+1], up the count
        if(values[index] > values[index+1])
            values[index+1] = values[index];
            count = 0;  //and if not, restart

        if (count == n)
                bubbled = false;


    printf("%i", values); //error: format specifies type 'int' but the argument has type 'int *' [-Werror,-Wformat]


1 Answer 1


The array name "values" is a pointer, it does not serve us %i, to show the complete array it is necessary to use a for loop:

for( int j = 0; j < n; j++)
    printf("%i", values[j]);

A void function returns nothing, but it has an effect on the program, in this case it changes the values array, when we pass a complete array to a function the changes occur in the original array, contrary to what normally happens. We do not want the function to return anything but yes we are interested in its effect.

  • thank you! By effect, do you mean if its true or false?
    – Nova
    Commented Jul 5, 2017 at 19:54
  • Nay, a function like bool search (int value, int values [], int n) returns true or false, really an integer, false zero, a nonzero number, true. A void function returns nothing to the calling function, not even true or false. Just do a task in the program, in this case the ordering of the array, and that is the only thing we want, there is a return value that we want to use, only the array change
    – MARS
    Commented Jul 5, 2017 at 20:09

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