[C++] Tutorial 1: Discussion

Alex

Python would be an even better one. Simple syntax, while teaching modern programming principles. Even after you move on to a different language, it's still great for scripting!

SqrachMasda

my question is simple, i think, but it still killing me in class
i kinda gave up on learning new stuff, because i still have not been able to successfully run it,....nothing to do with errors(though i'll have those) but i dont know the specific way to run a program when u finish,...the ending part just does not make sense for me, pretty much because i dont know how to do it

Alex

You're gonna have to be a bit more specific, mate . What language are you using? What compiler? Can you post exactly the problem you're having and post the source of what you have so far?

Adam Y.

Oddly enough that's not entirely true. .net express

gsolvers

i am creating two fileds a header file function.h with function wel() defined in it and a main file main.c which is calling wel() function define inside function.h. Hope this is enough.
function.h
public void wel()
{
printf("Hello Welcome !");
}

main.c

# "header.h"
int main(int argc, char *argv[])
{
wel();
return 0;
}

neurocomp2003

people shouhld alwasy start with pascal =]

arloane

I am having trouble getting my multidimensional array to do what I want it to do. Here is an exmple
of how I want this to look and how it will work.

row 1) Part Description | Part number //this is multidemsional array PD( row 1,columns 1-18 ), m array P#

row 2) Cam | 2110 // PD [1][0-4],Cam[1][0-4]

row 3) air filter | 1111 // PD [2][0-10],cam[2][0-4]
ect

My goal is on the first time the order function is entered to have row 1 and 2 display, the 2nd time the order function is entered rows 1,2,3 will display, the third rows 1,2,3,4 ect. Also the array will only display addresses not what it is supposed to. I know this is not an easy thing to do but I am not able to think of any other way to show all of the ordered items. Helllllllllllp plllllllllllllllease...........

here is the code I have.

#include <iostream>
#include <iomanip>
#include <ctype.h>
#include <stdlib.h>
using namespace std;

void partsorder(char order[]);
void list(char order[]);
int zz = 0;
const int ROWS = 50;
const int COLS = 50;
const int CAM = 20;

int main()
{
char shaft[CAM]="";

do
{
cout << "The cam number is 2110. The cam kit number is 2110k. Please enter\n"
<< "the approiate part number ";
cin.getline(shaft,CAM);
if (shaft[0] != 0) //if shaft is not null then goto
list(shaft);
}while(shaft[0] != 0);
}

void list(char order[])
{
if (zz == 0){
cout << " | Part Description |" << " Part # |\n ";
partsorder(order);
}
else {
partsorder(order);
}
}

void partsorder(char order[])
{
int num = 0, e = strlen(order);
num = atoi(order);
char c[CAM] = "Cam";
char ck[CAM] = "Cam kit";
char b,pd[ROWS][COLS];
zz++;

switch (num)
{
case 2110:
if (e == 4){
for(int y = 0; y < COLS; y++){
pd[zz][y]=c[y];

}
//strcpy(pd,c);
b = ' ';
//cout << "Please enter the quantity -->";
//cin >> q;
//price = 86 * q;
break;
}

else if (e == 5) {
for(int y = 0; y < COLS; y++){
pd[zz][y]=c[y];
}
//strcpy(pd,ck);
b = 'k';
//cout << "Please enter the quantity -->";
//cin >> q;
//price = 136 * q;
}
}
int x = 0;
for(int y = 0; y < COLS; y++){
cout << pd << endl;
for (x = 0; x <= zz; x++){
//cout << " | " << setw(16)<< setiosflags(ios::left) << pd [x][y]<< " | " << setw(5) << num << b << endl;
}
}
}

JamesU

no updates....

Grotesque Puppet

A 16-bit (2 byte) number ranges from 0 to 65535, or -32768 to 32767 depending if its signed or unsigned. To hold 65536 would require 17 bits.

Diane_

Maybe I'm in the wrong place, but what the heck. In the basic tutorial, you mention that the int is usually 4 bytes. I don't know if it's something you want to get into, but it is compiler-dependent. I had occasion to use the Borland compiler a few years ago, and ints were all over the place. Sometimes they were longs, sometimes they were shorts, and I never did find a pattern to it. I finally gave up declaring ints at all and went straight to longs and shorts.

For what it's worth...

jim mcnamara

The same problem obtains in a 64 bit environment where longs are 64 bits.
The Borland compilers are 16 bit, which is what MS-DOS and consumer Windows (Win95, Win98, WinME) are built on top of.

dduardo

I finally finished the basic c++ tutorial. If your interested in a particular topic in programming let me know and i'll see if I can accommodate you.

exequor

dduardo, it was a really good tutorial. Apart from the basics what else do you think would be good to know to solve problems using c++; such as for the acm programming contest? Do you plan to have an intermediate tutorial?

dduardo

For the intermediate I'll do pointers, strings, basic classes, structures and file io.

Then for advanced I'll do overloading, polymorphism, virtual and templates.

I could also do a tutorial just on alorithms: sorting, trees, heaps, queues, stacks, etc.

I could also do special topics like posix threads, interprocess communication (IPC), x86 asm, etc.

In terms of ACM programming you would want a tutorial on dynamic programming. I know when I did ACM that was a big topic.

Which one do you want?

ranger

How about a topic covering math functions, Stuff like trigonometry and so on?

dduardo

I could add math functions to intermediate and dynamic memory allocation to advanced.

Mattara

Without putting too much pressure/workload on you dduardo , i would like to see as much included as possible to make the tutorial show most sides of c++ programming and the different aspects of it.

My suggestion is to try and cover as much as possible as clearly as possible as you have done so far. I like the fact that the posts are not several pages long but gives a more-than-basic idea about the specific topic and it is up to the reader to go and try for themselves a bit instead of reading every program code out of a book.

Great tutorial