ATL / WTL / STL

How to change color of Tab View in MFC

10-Mar-18 1:07

And this one: C / C++ / MFC Discussion Boards[^]

Sampath57910-Mar-18 0:01

Sampath579

10-Mar-18 0:01

Hi.

In my MFC application, i created a class which is derived from CTabView and created few tabs(views) using AddView(). Now i want to change the color of the tab views. May i know how to change the background color of those views?

Thanks in Advance.

Re: How to change color of Tab View in MFC

Richard MacCutchan10-Mar-18 1:07

how to use getchar() to store n names in an array ?

10-Mar-18 1:07

You should post this in the proper forum for MFC questions: C / C++ / MFC Discussion Boards[^]

Tarun Jha26-Dec-17 8:31

Re: how to use getchar() to store n names in an array ?

26-Dec-17 8:31

i am trying to take multiple names by using getchar() but it only taking the first value and just skipping the rest.
here is the code.

C++

#include <stdio.h>

int main()
{
    char name[10][30], ch;
    int i;

    for(i=0; i<10; i++)
    {
        printf("Enter name: \n");

        int j=0;
        while(ch != '\n')
        {
            ch = getchar();
            name[i][j] = ch;
            j++;
        }
        name[i][j] = '\0';

    }

    return 0;
}

Richard MacCutchan26-Dec-17 8:46

Re: how to use getchar() to store n names in an array ?

26-Dec-17 8:46

Because at the end of the first time round the while loop ch will contain the newline character, so every other loop will terminate immediately. You must remember to reset variables after you have finished with them. Please get yourself a good study guide on C and learn the language the proper way.

Rick York26-Dec-17 10:04

Re: how to use getchar() to store n names in an array ?

26-Dec-17 10:04

In addition to what Richard wrote, you have limited the names to 30 characters so make sure more than that are not entered.

Tarun Jha26-Dec-17 20:02

how to initialize a value to pointer ?

26-Dec-17 20:02

Tarun Jha21-Dec-17 9:08

21-Dec-17 9:08

i tried adding values to different addresses of arrays by using pointer but it doesn't work.

C++

<pre>#include <stdio.h>

int main()
{
	int i, num[10];
	int *p;
	p = &num[0];
	
	for(i=0; i<=10; i++)
	{
		(p+i) = i;
		printf("\n%d", *(p+i));
	}
	
	
	return 0;
}

Rick York21-Dec-17 9:45

21-Dec-17 9:45

Inside your for loop it needs to have this :

C++

*(p+i) = i;

(p+i) is a pointer incremented by i. You have to dereference the pointer to save a value to where it is aiming.

Tarun Jha21-Dec-17 10:20

21-Dec-17 10:20

if p = address of the num[0] then (p+i) is the address of the ith address and it is where i want to store the value, *(p+i) will give the value at that address i.e. de-referencing, below is the code i tried.

C++

<pre>#include <stdio.h>

int main()
{
	int i, num[10];
	int *p;
	p = &num[0];
	
	for(i=0; i<=10; i++)
	{
		*(p+i) = i;
	}
	
	for(i=0; i<=10; i++)
	{
		printf("\n%d", *(p+i));
	}
	
	
	return 0;
}

Rick York21-Dec-17 12:25

21-Dec-17 12:25

You are very close. The problem now is your for loops are exceeding the capacity of num. It has 10 elements and your loops go from 0 to 10 inclusively. That is 11 elements - there is no num[11] item so that is a very bad thing.

I don't like literal values so I made the number a const and adjusted the loops :

const int Count = 10;

void main()
{
	int i;
	int num[Count];
	int *p;

	p = &num[0];
	
	for( i=0; i < Count; i++ )
	{
		*(p+i) = i;
	}
	
	for( i=0; i < Count; i++ )
	{
		trace( _T( "item %d is %d" ), i, *(p+i) );
	}
	return 0;
}

Your code looks quite a bit like C but this is a section for ATL/WTL/STL is about C++. If you are actually using C then this code won't compile. You can make Count a macro definition and then it will.

Tarun Jha26-Dec-17 8:13

26-Dec-17 8:13

thank you. And here is the correct code.

C++

<pre>
#include <stdio.h>
 
int main()
{
	int i, num[10];
	int *p;
	p = &num[0];
	
	for(i=0; i<10; i++)
	{
		*(p+i) = i;
	}
	
	for(i=0; i<10; i++)
	{
		printf("\n%d", *(p+i));
	}
	
	
	return 0;
}

modified 26-Dec-17 14:24pm.

Richard MacCutchan21-Dec-17 21:42

21-Dec-17 21:42

See Re: Recursion not working. - ATL / WTL / STL Discussion Boards[^]. You obviously have still not understood pointers and how to use them, so I say again, get a good book on C and study it hard.

Problem with recursion.

Tarun Jha16-Dec-17 5:46

16-Dec-17 5:46

The recursion used in the final_array function not working.

C++

#include <stdio.h>

int final_array(int arr[], int size, int k, int i);
void array(int arr[], int i, int size);

int main()
{
	int num, size[100];
	int i, j, k=0;
	int arr[100][100];

	printf("Enter the number of arrays: \t");
	scanf("%d", &num);
	num = num < 100 ? num: 100;
	//feeding elements.
	for (i = 0; i<num; i++)
	{
		printf("\nEnter the size of the array: \t");
		scanf("%d", &size[i]);

		printf("\nEnter the array: ");
		//int arr[i][size[i+1]];
		size[i] = size[i] < 100 ? size[i] : 100;
		array(&arr[i][0], i, size[i]);
	}

	for(i=0; i<num; i++)
    {
        final_array(&arr[i][0], size[i], k, i);
        printf("\n");
    }

	printf("\nPress Enter key to exit.\n");
	getchar();

	return 0;
}

void array(int arr[], int i, int size)
{
	int j;
	for (j = 0; j<size; j++)
	{
		printf("\nEnter arr[%d][%d]: \t",i, j);
		scanf("%d", &arr[j]);
	}
}

int final_array(int arr[], int size, int k, int i)
{
    if(k<=size)
    {
        printf("%d", arr[k]);
        final_array(&arr[i][0], size[i], k++, i);
    }
    else
        return 0;


    /*
    int j;
    for(j=0; j<size; j++)
    {
    	printf("%d\t", arr[j]);
	}
	*/
}

modified 16-Dec-17 13:25pm.

Richard MacCutchan16-Dec-17 6:24

16-Dec-17 6:24

what does "not working" mean?

[edit]
Looking back this seems to be a continuation of your previous questions, but much the same issue. I would strongly suggest you get hold of a good book on C programming and spend a lot of time studying the principles, and getting familiar with structures, arrays, functions etc.
[/edit]

Tarun Jha16-Dec-17 7:51

16-Dec-17 7:51

can you name some book's, or you can tell me what my mistake is and how can i correct it. Smile | :)

Richard MacCutchan16-Dec-17 9:49

16-Dec-17 9:49

There are plenty of books around. Try a google search or go to your local bookshop.

Rick York21-Dec-17 9:49

To take input for n number of arrays and print it.

21-Dec-17 9:49

I started with a book by Scott Meyers called "Beginning C" or something like that. I can't seem to find it now so it may be out of print.

Tarun Jha10-Dec-17 4:55

Re: To take input for n number of arrays and print it.

10-Dec-17 4:55

in the below code it prints for arr[0] and not after it. please tell to correct.

C++

<pre>
#include <stdio.h>

int i, j;
int arr[100][100];

void array(int arr[i][j], int size[i+1])
{

	for(j=0; j<size[i+1]; j++)
	{
		scanf("%d", &arr[i][j]);
		printf("arr[%d][%d]\n", i, j);
	}
	
}

/*
void merge()
{
	int ;

}
*/

int main()
{
	int num,size[100];

	printf("Enter the number of arrays: \t");
	scanf("%d", &num);
	
	size[0] = 0;
	
	//feeding elements.
	for(i=0; i<num; i++)
	{
		printf("\nEnter the size of the array: \t");
		scanf("%d", &size[i+1]);

		printf("\nEnter the array: \n");
		//int arr[i][size[i+1]];
		array(arr, size);
	}

	for(i=0; i<num; i++)
	{
		for(j=0; j<size[i+1]; j++)
		{
			printf("\n%d", arr[i][j]);
		}
	}
	
	return 0;
}

Richard MacCutchan10-Dec-17 5:49

Re: To take input for n number of arrays and print it.

10-Dec-17 5:49

I cannot figure out what you are trying to do but most of what you have makes no sense at all. Statements such as:

C++

void array(int arr[i][j], int size[i+1]) // what are all these indices supposed to mean?

scanf("%d", &arr[i][j]);
printf("arr[%d][%d]\n", i, j); // what are you trying to print?

Tarun Jha10-Dec-17 6:11

Re: To take input for n number of arrays and print it.

10-Dec-17 6:11

the user will input n number of arrays of different array sizes, and then the program will print every array that user has entered.
I want to create a program that will merge n number of arrays.

Richard MacCutchan10-Dec-17 6:18

Re: To take input for n number of arrays and print it.

10-Dec-17 6:18

To create the arrays you need to get the size of each dimension and then create the array dynamically. You cannot pre-allocate them if you do not have their size. Once you have all the requested arrays then you need to create another one that will contain the results of your merge.

Tarun Jha10-Dec-17 6:48

Re: To take input for n number of arrays and print it.

10-Dec-17 6:48

if you run the code it will take the size of array first and then fill in the respective elements in according to the size entered.
But i am not able to print it on the screen.
Please run it and tell me what's wrong.

Richard MacCutchan10-Dec-17 6:52