External Errors & Unable to exit via switch case.

[Carl_Smith]

Sup.

The basics of the program is that:

It will ask the user whether they want to: Pop, Push , Peek or Exit the program. When it comes to the Exit case:

I can't figure out how do so( tried exit(1) & exit(0) using the internet hasn't brought me much luck either. Maybe a forum will


I am getting these two errors also, without any idea how to fix it.

"Error LNK2019 : Unresolved external symbol "int_cdcel peek(void)" (?peek@@YAHXZ)"


Each applying to the functions below.


"Error LNK1120: 3 Unresolved Externals"


I'm not sure their is much more I can say about the problem.

Hopefully that is more then enough to go on.

Thankies

Carl

[code is below!]

#include "stdafx.h"#include <stdio.h>


/* Libary Collection.*/


#define MAX 10


/* Define: The max size of what we are working with.*/


int push (void);
int  pop(void);
int peek (void);




/* Declaring the three global functions to be used in the program.*/


int _tmain(int argc, _TCHAR* argv[])
{
    int stack[MAX];
    int top = 0;
    
    int ch; /* Choice variable for switch statement*/
    do
    {
     printf("\n\n\n\n1.\tPush\n2.\tPop\n3.\tDisplay\n4.\tExit\n"); 
     printf("\nEnter your choice: "); 
     scanf_s("%d", &ch); 


     /* Above prints out the users choices & prompts & scan for the users input and following accordingly*/


     switch(ch) 
     { 
     case 1: 
     push(); 
     break; 
 
     case 2: 
     pop(); 
     break; 
 
     case 3: 
     peek(); 
     break; 


     case 4:
    // I need to set case 4 : to exit the program: However, I can't figure out how too.
     break;
        
     default: 
 printf("\n\nInvalid entry. Please try again...\n"); 
 } 
 } while(ch!=4); 
 getchar(); 
}






/* I have 4 other errors on the program:


"Error LNK2019 : Unresolved external symbol "int_cdcel peek(void)" (?peek@@YAHXZ)"


Each applying to the functions below.


&&


"Error LNK1120: 3 Unresolved Externals"








/* Three functions created: Peek, Push & Pop*/


 int pop(int &top, int stack[])
{
    if(top > 0) 
    {
        top--; 
        return stack[top]; 
    }
    else
    {
    return -1;
    }
}


int push(int &top, int stack[], int value)


{
    if(top < MAX)
    {
        stack[top] = value; 
        top++; 
        return 1;
    }
    else
    {
    return 0;
    }
}


int peek(int top, int stack[])
    {
        return stack[top];
    }

Edit: I was also told that I could us if statements instead but, that still will remove the first errors

[stahta01]

Instead of these in-correct prototypes try using the correct ones.

int push (void);
int  pop(void);
int peek (void);

I am guessing this is the correct ones.

int pop(int &top, int stack[]);
int push(int &top, int stack[], int value);
int peek(int top, int stack[]);

Tim S.

[nonpuz]

What you're doing now should work.

If ch is 4 then the while(ch!=4) condition fails and the do while loop ends. You don't even need to handle it in the switch()

[Suhasa010]

case 2: 
     pop();

.
.
.

int pop(int &top, int stack[])

where are you passing the parameters while calling the three functions in main() ??

for exiting u should use the same exit(0) or exit(1) function and include stdlib.h or process.h header files. Without that also your program will work fine. :-)

[Carl_Smith]

Instead of these in-correct prototypes try using the correct ones.

int push (void);
int  pop(void);
int peek (void);

I am guessing this is the correct ones.

int pop(int &top, int stack[]);
int push(int &top, int stack[], int value);
int peek(int top, int stack[]);

Tim S.

It works however, only causing another error : That the functions called in the switch have too few arguments(trying to figure a solution for that now.)

What you're doing now should work.

If ch is 4 then the while(ch!=4) condition fails and the do while loop ends. You don't even need to handle it in the switch()

Maybe so, however I'd like to be able to press "4" & it exits the program.

case 2: 
     pop();

.
.
.

int pop(int &top, int stack[])

where are you passing the parameters while calling the three functions in main() ??

for exiting u should use the same exit(0) or exit(1) function and include stdlib.h or process.h header files. Without that also your program will work fine. :-)

Exit works now thank you.

I'm passing the parameters && input into the stack to be used, so I can push pop n peek into the array

[stahta01]

If you still have a problem; I suggest posting the current code and error message after reading this link.

Functions in C - Cprogramming.com

Tim S.

[Carl_Smith]

Well

Thank you for replies feels like i'm wasting more & more time to do this task so I will just try an alternate approach.

Thankies for your time ^_^