[robert2513]

Hi.

I am working on this program for my C++ class. The assignment is you have to take a list, and sort it three different ways: Reverse, opposite order of how the user entered the numbers, Normal, how the user put in the numbers, and Sorted, from least to greatest.

Well, I got most of it done but when I compile it, I get an "implicit declaration of function "int swap(...)" According to the compiler, its on line 95. I have looked at this line and the declaration of my function "swap" but cannot find a problem with it. What does this type of error usually mean? Can anyone see what I am missing?

Thanks

#include<iostream.h>

int main()
{

//Funtion Prototypes
// The "s" variable stands for size

   void normal(int norm_list[], int& s);
   void reverse (int rev_list[], int& s);
   void sort (int sort_list[], int& s);
   void swap (int& x, int& y);

//Decleaer Variables
//Size is for the size of the list and index is the location in the array

	int size, index;


//Ask user for size of the list

	cout << "Please enter the size of the list: " ;
	cin >> size;

//Decleare array list[]
//Also, for loop enters the list into the array

	int list[size];
	for (index=0; index <=  size-1; index++)
	     {
		   cout << "Please enter the next interger: ";
           cin >> list[index];
	     }

//Call to functions to sort the numbers
//Functions (in order): Reverse, Normal, Sort

    reverse (list, size);
	normal (list, size);
    sort (list, size);

//Program End

cout << endl;
return 0;

}


//Reverse Function

void reverse (int rev_list[], int& s)
     {
        int x;

        cout << "List in REVERSE order:\n\n";
        for (x = s-1; x >=0; x--)
            {
               cout << rev_list[x] << "\n";
            }
        cout << "\n\n";
     }


//Normal Function

void normal(int norm_list[], int& s)
     {
	   int x;

       cout << "List in NORMAL order (as user inputted it): \n\n";
       for (x=0; x <= s-1; x++)
           {
               cout << norm_list[x] << "\n";
           }
       cout << "\n\n";
     }

 
//Sort Function

void Sort(int sort_list[], int& s)
    {
       int pass, k, x;
       for (pass=1; pass < s; pass++)
           {
             for (k=0; k < s - 1; k++)
                  {
                      if (sort_list[k+1] < sort_list[k])
                         {
                            swap (sort_list[k], sort_list[k+1]);
                         }
                  }
           }
       
        cout << "List in SORTED order (from least to greatest): \n\n";
        for (x=0; x < s; x++)
             {
                cout << sort_list[x] << "\n";
             }
        cout << "\n\n";
     }


//Swap Function

void swap(int& x, int& y)
     {
        int temp;

        temp = x;
        x = y;
        y = temp;
     }

[Shadow2531]

The swap error was because you had void swap (int& x, int& y); inside main (along with the other ones).

Then, there was a little problem with your Sort function();

Here's a little cleanup. You can take it from there.

#include <iostream>

using namespace std;

void swap(int& x, int& y) {
    int temp = x;
    x = y;
    y = temp;
}

void reverse (int rev_list[], int& s) {
    cout << "List in REVERSE order:\n\n";
    for (int x = (s - 1); x >= 0; --x) {
        cout << rev_list[x] << "\n";
    }
    cout << "\n\n";
}

void normal(int norm_list[], int& s) {
    cout << "List in NORMAL order (as user inputted it): \n\n";
    for (int x= 0; x <= (s - 1); ++x) {
        cout << norm_list[x] << "\n";
    }
    cout << "\n\n";
}

void sort(int sort_list[], int& s) {
    for (int pass = 1; pass < s; ++pass) {
        for (int k = 0; k < (s - 1); ++k) {
            if (sort_list[ k + 1 ] < sort_list[k]) {
                swap (sort_list[k], sort_list[ k + 1 ]);
            }
        }
    }
    cout << "List in SORTED order (from least to greatest): \n\n";
    for (int x = 0; x < s; ++x) {
        cout << sort_list[x] << "\n";
    }
    cout << "\n\n";
}

int main() {
    cout << "Please enter the size of the list: " ;
    int size;
    cin >> size;
    int list[size];
    for (int i = 0; i < size; ++i) {
        cout << "Please enter the next interger: ";
        cin >> list[i];
    }
    reverse(list, size);
    normal(list, size);
    sort(list, size);
    cout << endl;
}