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[Sirus]

Blame my teacher, I guess. He had us make function prototypes that included the list[] and size variables. This whole exercise seems pretty shoddy, or maybe I'm just confused again.

Well, progress has been made I suppose. Getting rid of list[] and size allowed me to input the integers to be reversed. Sadly, pressing Enter made the program crash.

[fergus]

Did you change Getnum() to return readNum aswell? Not doing that might be cause funny problems.

[Sirus]

Like this?

Code: [Select]

return readNum;

[fergus]

Yes. Could you post all of what you have now?

[Sirus]

Not much has changed really, but here ya go:

Spoiler (click to show/hide)

Code: [Select]

/* Read a number series and print it reversed.
   Written by:
   Date:
*/
#include <stdio.h>
#define MAX_SIZE 50

//Function Declarations
int getNum();
void getArray(int [], int);
void printArray(int [], int);

int main (void)
{
// Local Declarations
int readNum;
int numbers[MAX_SIZE];

// Statements
readNum = getNum(); //read values for the size of the array

getArray(numbers, readNum); //fill up the array

printArray(numbers, readNum); //print the array

printf("\n\n");

return 0;

} // main

/*====getNum====
Reads the data input by
the user.
pre: nothing
Post: data returned to main
*/
int getNum()
{
// Local Declarations
int readNum;


// Statements
printf("You may enter up to 50 integers:\n");
printf("How many would you like to enter? ");
scanf ("%d", &readNum);

if (readNum > MAX_SIZE)
    readNum = MAX_SIZE;

return readNum;
} //getNum

void getArray(int readNum, int numbers[MAX_SIZE])
{
int i;

printf("\nEnter your numbers: \n");
for ( i = 0; i < readNum; i++)
     scanf("%d", &numbers[i]);

return;
}

void printArray(int readNum, int numbers[MAX_SIZE])
{
int numPrinted;
int i;

printf("\nYour numbers reversed are: \n");
for ( i = readNum - 1, numPrinted = 0;
         i >= 0;
         i--)
   {
    printf("%3d", numbers[i]);
    if (numPrinted < 9)
        numPrinted++;
    else
       {
        printf("\n");
        numPrinted = 0;
       } // else
   } // for
}

Now shame me with my obliviousness!

[fergus]

The parameters in getArray() and printArray() should be swapped around:

Code: [Select]

void getArray(int numbers[MAX_SIZE], int readNum)
void printArray(int numbers[MAX_SIZE], int readNum)
instead of

Code: [Select]

void getArray(int readNum, int numbers[MAX_SIZE])
void printArray(int readNum, int numbers[MAX_SIZE])


[Sirus]

...what. WHAT.
It's really that simple? I even thought of that, but dismissed it because it didn't seem to matter D:

Welp, I am officially shamed. Thanks!

[fergus]

...what. WHAT.
It's really that simple? I even thought of that, but dismissed it because it didn't seem to matter D:

Welp, I am officially shamed. Thanks!

I'm kind of confused about your compiler, because when I tried compiling your code, both before and after revision, it just threw some errors. Do you know why yours didn't?

Spoiler: Compiler errors (click to show/hide)

Before changes:

Code: [Select]

../main.c: In function 'getNum':
../main.c:60:2: warning: 'return' with no value, in function returning non-void [-Wreturn-type]
../main.c:50:6: warning: unused variable 'numbers' [-Wunused-variable]
../main.c: At top level:
../main.c:63:6: error: conflicting types for 'getArray'
../main.c:18:6: note: previous declaration of 'getArray' was here
../main.c:74:6: error: conflicting types for 'printArray'
../main.c:19:6: note: previous declaration of 'printArray' was here
After changes:

Code: [Select]

../main.c:63:6: error: conflicting types for 'getArray'
../main.c:18:6: note: previous declaration of 'getArray' was here
../main.c:74:6: error: conflicting types for 'printArray'
../main.c:19:6: note: previous declaration of 'printArray' was here


[Sirus]

I use Microsoft Visual Basic 2010. The code runs fine both here at home and on the school computers, so I don't know what's up.

I do know one weird thing about VB2010: you can't initialize variables inside for() loops. Other than that I'm not familiar enough with different compilers to troubleshoot.

[MaximumZero]

Does anyone have a simple explanation on what the hell "toString" in java is? There's about 3/4 of a page on it in the book, but it mostly just looks like a compiler threw up on the page. Wat do, B12?

[MadocComadrin]

toString is called by various functions (such as System.out's print function) to return a string representation of an object. It is originally defined in the Object class, and since all classes in Java extend object, it is something you should override to represent your own classes.

Code like this: System.out.println("My object: " + myObject);
is equivalent to this: System.out.println("My object: " + myObject.toString());

For example, a Fraction class might have a toString method that returns a string in the form "<numerator>/<denominator>." Eg, creating an object of the Fraction class with 3 as the numerator and 5 as the denominator would have a call to toString return "3/5".

Another example, a class representing a linked list my have toString return a string containing the value of its content's toString method separated by commas.

[Nadaka]

Does anyone have a simple explanation on what the hell "toString" in java is? There's about 3/4 of a page on it in the book, but it mostly just looks like a compiler threw up on the page. Wat do, B12?

http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html#toString()

toString is the method of an Object used to convert it into a string. By default it returns the name of the class + '@' + the hash of the object. It can be overridden. If it puked out a page of stuff, it is most likely either overridden or has an overridden hashCode() method that dumps a particularly large hash.

edit: for some reason the html anchor is broken for the toString method.

[DJ]

OK, so I've got my DLL thingy working, but I can't debug. I'm using Sprite class from the DLL in the main program. I try placing a breakpoint in the Sprite's constructor, but it tells me "The breakpoint will not currently be hit. No executable code is associated with this line. Possible causes include: preprocessor directives or compiler/linker optimizations." I know that the constructor gets executed because the variables get initialized properly. So how do I debug? Using Visual C++ 2010 Express.

[Nadaka]

Is the dll project part of the same solution as the project using it? Or just the dll referenced? I recall that visual studio has an option to include source files in a dll when it is built.

[DJ]

It's in the same solution, I think. At least it shows in the solution explorer.

*edit* NVM, I just had to change the main project's debugger type to mixed.