C / C++ / MFC

19-Jun-15 16:38

Hi sir need clear a explanation for this problem
(n = 3)??wap for this

1###1
33#33
55555
33#33
1###1

at the place of (#) should come spaces

Richard MacCutchan19-Jun-15 21:13

19-Jun-15 21:13

Member 11779027 wrote:
need clear a explanation for this problem

That is a fairly basic logic/counting problem that you should be able to figure out by writing the numbers on paper, and deciding how to calculate the number of digits vs the number of spaces for each value.

Member 1177902720-Jun-15 21:07

20-Jun-15 21:07

Sir Thanks for your advice Finally done!!! but check it once and report me back if any problem is there in coding
#include<stdio.h>
#include<conio.h>
int main()
{
int num=3;

for(int r1=1;r1<=num;r1++)
{
for(int c1=1;c1<=r1;c1++)
{
printf("*");
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int c1=1;c1<=r1;c1++)
{
printf("*");
}
printf("\n");
}
for(int r2=num;r2>=1;r2--)
{
for(int c2=1;c2<=r2;c2++)
{
printf("*");
}
for(int s1=r2;s1<num;s1++)
{
printf(" ");
}
for(int s1=r2;s1<num;s1++)
{
printf(" ");
}
for(int c2=1;c2<=r2;c2++)
{
printf("*");
}
printf("\n");
}
}

Richard MacCutchan20-Jun-15 21:14

20-Jun-15 21:14

What result do you get?

Member 1177902720-Jun-15 21:21

20-Jun-15 21:21

* *
** **
******
** **
* *

Richard MacCutchan20-Jun-15 21:33

20-Jun-15 21:33

Your loop values are slightly off. You should be counting 1 - 3 - 5 - 3 - 1, and printing the numeric values in each line rather than stars. Your main loops should be something like:

C++

int num = 5;
int index;
// go from 1 to 5
for (index = 1; index <= num; index += 2)
{
    // print the first set of values
    printf("%d\n", index);  // just to show the number
}
// already printed the 5 set, so go from 3 to 1
for (index = num - 2; index > 0; index -= 2)
{
    // print the last set of values
    printf("%d\n", index);
}

Member 1177902720-Jun-15 21:40

20-Jun-15 21:40

Ok sir Thnak's and could you please give some examples to practise in this pattern??

Richard MacCutchan21-Jun-15 1:29

21-Jun-15 1:29

That is an example, your job is to fill in the fine detail. You will learn much more by trying it yourself than if someone else writes it for you. As an exercise you can try different values of num also.

Member 1177902720-Jun-15 21:32

20-Jun-15 21:32

yes sir the actual result is this

#include<stdio.h>
#include<conio.h>
int main()
{
int num=5;

for(int r1=1;r1<=num;r1+=2)
{
for(int c1=1;c1<=r1;c1++)
{
printf("%d",r1);
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int c1=1;c1<=r1;c1++)
{
printf("%d",r1);
}
printf("\n");
}
for(int r2=num;r2>=1;r2-=2)
{
for(int c2=1;c2<=r2;c2++)
{
printf("%d",r2);
}
for(int s1=r2;s1<num;s1++)
{
printf(" ");
}
for(int s1=r2;s1<num;s1++)
{
printf(" ");
}
for(int c2=1;c2<=r2;c2++)
{
printf("%d",r2);
}
printf("\n");
}
}

CPallini19-Jun-15 23:41

CPallini

19-Jun-15 23:41

You could make some reasoning about row number and to-be-produced pattern:

The first point could be observig that

pattern(0) == pattern(4)
pattern(1) == pattern(3)
pattern(2) == pattern(2)

all hold true.
In other words

pattern(k) == pattern(4-k)

hold true for

k = 0, 1 , 2;

Go on and post specific questions when you are not able to continue.

Member 1177902720-Jun-15 20:49

20-Jun-15 20:49

#include<stdio.h>
#include<conio.h>
int main()
{
int num=3;

for(int r1=1;r1<=num;r1++)
{
for(int c1=1;c1<=r1;c1++)
{
printf("*");
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int c1=1;c1<=r1;c1++)
{
printf("*");
}
printf("\n");
}
for(int r2=num;r2>=1;r2--)
{
for(int c2=1;c2<=r2;c2++)
{
printf("*");
}
for(int s1=r2;s1<num;s1++)
{
printf(" ");
}
for(int c2=1;c2<=r2;c2++)
{
printf("*");
}
printf("\n");
}
}
sir problem is with last loop??please check it once and report back to me soon.. thankyou

Member 1177902720-Jun-15 20:52

Event objects VS Global variables

20-Jun-15 20:52

#include<stdio.h>
#include<conio.h>
int main()
{
int num=3;

for(int r1=1;r1<=num;r1++)
{
for(int c1=1;c1<=r1;c1++)
{
printf("*");
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int s1=r1;s1<num;s1++)
{
printf(" ");
}
for(int c1=1;c1<=r1;c1++)
{
printf("*");
}
printf("\n");
}
for(int r2=num;r2>=1;r2--)
{
for(int c2=1;c2<=r2;c2++)
{
printf("*");
}
for(int s1=r2;s1<num;s1++)
{
printf(" ");
}
for(int c2=1;c2<=r2;c2++)
{
printf("*");
}
printf("\n");
}
}

problem is with last loop sir??please check it once and report back to me soon

sourabhmehta17-Jun-15 22:52

sourabhmehta

17-Jun-15 22:52

Hi Everyone,

I am new to multithreading. I was trying controlling threads using EVENT Objects. FYI i have single process and multiple threads.

I could achieve the same results without using events. Instead i used global flags to achieve the same.I can totally understand that using global variable is not a good practice.

Can anybody tell, what else is a major difference and if anybody can give some specific examples where only events can be used.

Thanks in advance

Richard Andrew x6418-Jun-15 6:38

Richard Andrew x64

18-Jun-15 6:38

The main difference is that a thread can wait on an event but not a global variable.

The difficult we do right away...
...the impossible takes slightly longer.

Stephen Hewitt18-Jun-15 6:41

Stephen Hewitt

18-Jun-15 6:41

When a thread waits on an event it isn't scheduled and so consumes so no CPU time. Waiting on a global variable requires polling and so does.

Steve

modified 18-Jun-15 21:41pm.

David Crow18-Jun-15 9:15

David Crow

18-Jun-15 9:15

Stephen Hewitt wrote:
...and so consumes so CPU time. Waiting on a global variable requires polling and so does.

Am I misreading this?

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Richard Andrew x6418-Jun-15 9:48

Richard Andrew x64

18-Jun-15 9:48

He meant "NO cpu time."

The difficult we do right away...
...the impossible takes slightly longer.

Stephen Hewitt18-Jun-15 15:42

Stephen Hewitt

18-Jun-15 15:42

You are reading correctly, I just spelt "no" wrong. And it's an easy word too.

Steve