Helps with loops

Question

manutd4life 0 Junior Poster

14 Years Ago

here's my question:
write a program that asks the user to type the value of N and writes this picture :
N=1
*
N=2
**
*
N=3
***
**
*

here's my work:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
	int count = 0; 
	
	do
	{ 
      printf("N=");
	  scanf ("%d",&numOfStars);
	  
	  if (numOfStars != 9999)
	  {
         for (count < numOfStars; ++count;)
             printf("*");               
      }
      printf("endl");
     }
      while (numOfStars != 9999);

  system("PAUSE");	
  return 0;
}

MY problem is that when run, and enter a number it become endless loop
any help please

thanks

c

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Latest Post 13 Years Ago Latest Post by manutd4life

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Ancient Dragon 5,243 Achieved Level 70

14 Years Ago

>> printf("endl");

Huh?? endl is c++, not c, and its not in quotes. I think what you want is printf("\n");

Salem 5,138 Posting Sage

14 Years Ago

> for (count < numOfStars; ++count;)
The general syntax for a for loop is
for ( initialisation ; comparison ; step )

Which part is your "comparison" ?
Which part should be the initialisation?

Edited 14 Years Ago by Salem because: n/a

FREEZX 0 Light Poster

14 Years Ago

well, your code gets in an endless loop because if numofstars!=9999 is the condition for your loop. your program will never reach that value if numofstars is left unchanged. Like Salem said.. your loop in the if statement is not declared properly. if you want to use count as the variable, you should at least add a semicolon before your condition, so you just skip the definition, like this:
for ('count < numOfStars; ++count;)

Salem 5,138 Posting Sage

14 Years Ago

> it says error
How many ; should a loop have?

FREEZX 0 Light Poster

14 Years Ago

thanks you very much for your help
but when i write it like this
for (int count = 0;count < numOfStars; ++count;)
it says error
thanks

you cannot do that. if you have int before the variable name you declare it. you cannot declare a static variable more than once. so here you could just set its value.
for (count = 0;count < numOfStars; ++count)
this should work.

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manutd4life 0 Junior Poster · Answer 1 · 2010-04-15T01:20:06+00:00

thanks you very much for your help

but when i write it like this

for (int count = 0;count < numOfStars; ++count;)

it says error
thanks

FREEZX 0 Light Poster · Answer 2 · 2010-04-15T01:22:48+00:00

> it says error
How many ; should a loop have?

it should have 2 semicolons. one after the initialisation, one after the condition.

manutd4life 0 Junior Poster · Answer 3 · 2010-04-15T01:24:42+00:00

> it says error
How many ; should a loop have?

i dont know :(
its only 4 days am learning C

manutd4life 0 Junior Poster · Answer 4 · 2010-04-15T01:28:34+00:00

for (count = 0;count < numOfStars; ++count)
this should work.

its not working

manutd4life 0 Junior Poster · Answer 5 · 2010-04-15T01:37:26+00:00

ok its working,but not like i wanted
can any1 help me with my code:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
    int count;
	
	do
	{ 
      printf("N=");
	  scanf ("%d",&numOfStars);
	  
	  if (numOfStars != 9999)
	  {
         for (count = 0;count < numOfStars; ++count)
             printf("*");               
      }
      printf("\n");
     }
      while (numOfStars != 9999);

  system("PAUSE");	
  return 0;
}

so the problem is, when i enter 3 it gives me 3 star
N=3
***
but i wanted

N=3
***
**
*

any helps please

FREEZX 0 Light Poster · Answer 6 · 2010-04-15T02:12:17+00:00

try putting it in a loop where n decreases till it reaches 1 and doing the same thing like this. dont forget a new line at the end of the loop

manutd4life 0 Junior Poster · Answer 7 · 2010-04-15T02:16:09+00:00

try ( ;count < numOfStars; ++count)

this is working now
see above problem not yet solved:(

when enter 3 got 3 stars
N=3
***
but i want this
N=3
***
**
*

any help abt how to modify my code?

thank you very much for your help
thank you

FREEZX 0 Light Poster · Answer 8 · 2010-04-15T02:25:27+00:00

this is working now
see above problem not yet solved:(
when enter 3 got 3 stars
N=3
***
but i want this
N=3
***
**
*
any help abt how to modify my code?
thank you very much for your help
thank you

as i said. add a loop.

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
    int count;
	
	do
	{ 
      printf("N=");
	  scanf ("%d",&numOfStars);
          for(int i=nimOfStars; i>0; i--)
{
	  if (numOfStars != 9999)
	  {
         for (count = 0;count < numOfStars; ++count)
             printf("*");               
      }
      printf("\n");
}
     }
      while (numOfStars != 9999);

  system("PAUSE");	
  return 0;
}

try this and see what you get.

manutd4life 0 Junior Poster · Answer 9 · 2010-04-15T02:44:45+00:00

as i said. add a loop.

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
    int count;
	
	do
	{ 
      printf("N=");
	  scanf ("%d",&numOfStars);
          for(int i=nimOfStars; i>0; i--)
{
	  if (numOfStars != 9999)
	  {
         for (count = 0;count < numOfStars; ++count)
             printf("*");               
      }
      printf("\n");
}
     }
      while (numOfStars != 9999);

  system("PAUSE");	
  return 0;
}

try this and see what you get.

when put 3 i got
N=3
***
***
***

for 2

N=2
**
**

and this not working

for(int i=nimOfStars; i>0; i--)

i need to define int i; first and remove the INT in the for loop

thanks

FREEZX 0 Light Poster · Answer 10 · 2010-04-15T02:47:14+00:00

my bad.

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
    int count;
	
	do
	{ 
      printf("N=");
	  scanf ("%d",&numOfStars);
          for( ;numOfStars>0; numOfStars--)
{
	  if (numOfStars != 9999)
	  {
         for (count = 0;count < numOfStars; ++count)
             printf("*");               
      }
      printf("\n");
}
     }
      while (numOfStars != 9999);

  system("PAUSE");	
  return 0;
}

manutd4life 0 Junior Poster · Answer 11 · 2010-04-15T03:03:24+00:00

my bad.

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
    int count;
	
	do
	{ 
      printf("N=");
	  scanf ("%d",&numOfStars);
          for( ;numOfStars>0; numOfStars--)
{
	  if (numOfStars != 9999)
	  {
         for (count = 0;count < numOfStars; ++count)
             printf("*");               
      }
      printf("\n");
}
     }
      while (numOfStars != 9999);

  system("PAUSE");	
  return 0;
}

WAOW thanks man
its working
i'll study this well

thank you

a last question
suppose i want it to display like this:
N=3
***
..**
....*
(exclude the dots)

FREEZX 0 Light Poster · Answer 12 · 2010-04-15T03:05:54+00:00

than the for loop i added would have to move from 1 to numOfStars, not from numofstars to 1. rep points are always welcomed if you want to say thanks :)

manutd4life 0 Junior Poster · Answer 13 · 2010-04-15T03:13:38+00:00

than the for loop i added would have to move from 1 to numOfStars, not from numofstars to 1. rep points are always welcomed if you want to say thanks :)

can u just show me in the code plzz
AND Where to say Thanks?
cant see any button

FREEZX 0 Light Poster · Answer 14 · 2010-04-15T15:20:17+00:00

can u just show me in the code plzz
AND Where to say Thanks?
cant see any button

1.
      #include <stdio.h>
   2.
      #include <stdlib.h>
   3.
       
   4.
      int main(int argc, char *argv[])
   5.
      {
   6.
      int numOfStars = 0, nos;
   7.
      int count;
   8.
       
   9.
      do
  10.
      {
  11.
      printf("N=");
  12.
      scanf ("%d",&nos);
  13.
      for( ; numOfStars<=nos; numOfStars++)
  14.
      {
  15.
      if (numOfStars != 9999)
  16.
      {
  17.
      for (count = 0;count < numOfStars; ++count)
  18.
      printf("*");
  19.
      }
  20.
      printf("\n");
  21.
      }
  22.
      }
  23.
      while (numOfStars != 9999);
  24.
       
  25.
      system("PAUSE");
  26.
      return 0;
  27.
      }

So you take the nos and move it from 0 to nos. the nos is what your final number of stars should be.

Xufyan -4 Posting Whiz · Answer 15 · 2010-04-15T19:49:52+00:00

simply use the field width specifiers

WAOW thanks man
its working
i'll study this well
thank you
a last question
suppose i want it to display like this:
N=3
***
..**
....*
(exclude the dots)

manutd4life 0 Junior Poster · Answer 16 · 2010-04-18T03:41:13+00:00

simply use the field width specifiers

what u mean by this: field width specifiers
any example??
thanks in advance

Ancient Dragon 5,243 Achieved Level 70 Team Colleague Featured Poster · Answer 17 · 2010-04-18T10:05:09+00:00

what u mean by this: field width specifiers
any example??
thanks in advance

if you want a field to be 5 characters, then printf("%5s", "Hello");. If you want the text to be right justified then its the same with a - symbol printf("%-10s", "Hello"); Write yourself a little program to test that out for yourself so that you can see how it works.

manutd4life 0 Junior Poster · Answer 18 · 2010-04-18T23:05:45+00:00

if you want a field to be 5 characters, then printf("%5s", "Hello");. If you want the text to be right justified then its the same with a - symbol printf("%-10s", "Hello"); Write yourself a little program to test that out for yourself so that you can see how it works.

hello,
ok i understand the piece of code u written, i tried it and see what it mean,
but cant get any idea to put it in a loop to get the result i wanted

the question is in another thread : http://www.daniweb.com/forums/thread276781.html

please take a look

thank you very much for helping me

manutd4life 0 Junior Poster · Answer 19 · 2010-04-19T19:02:21+00:00

if you want a field to be 5 characters, then printf("%5s", "Hello");. If you want the text to be right justified then its the same with a - symbol printf("%-10s", "Hello"); Write yourself a little program to test that out for yourself so that you can see how it works.

hello i do this code, but not getting the right result any help please??
here's the code:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    int numOfStars = 0;
    int count, counter;

    do
    { 
      printf("N=");
      scanf ("%d",&numOfStars);

for( ; counter<=numOfStars; counter++)
{
       for( ;numOfStars>0; numOfStars--)
       {
         if (numOfStars != 9999)
          {
            for (count = 0;count < numOfStars; count++)
             {
               printf("*");  
             }
            printf("\n");
         }               
       }
       printf(" ");
}
     }

     while (numOfStars != 9999);

  system("PAUSE");  
  return 0;
}

thanks

0x69 41 Junior Poster · Answer 20 · 2010-04-19T22:39:00+00:00

here's my question:
write a program that asks the user to type the value of N and writes this picture :
N=1
*
N=2
**
*
N=3
***
**
*

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
	
	do
	{ 
         // it is bad place for print and scan.
         // move these 2 lines somewhere else
         // think only - where ? (and why ?)
         printf("N=");
	 scanf ("%d",&numOfStars);
	  
         // think do you really need this branch ?
         // or you can live without it ?
	 // if (numOfStars != 9999)
	 // {
         for (int count=0; count < numOfStars; ++count)
             printf("*");               
         //}
      printf("\n");
      // something is missing here. Think - What is missing ?
      // maybe single operation with numOfStars variable ??
     }
      while (numOfStars != /* bad bad bad number 9999, think of any other - more useful number*/);

  system("PAUSE");	
  return 0;
}

I made useful hints in your example. The rest - you should find out yourself.

manutd4life 0 Junior Poster · Answer 21 · 2010-04-19T23:07:42+00:00

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
	
	do
	{ 
         // it is bad place for print and scan.
         // move these 2 lines somewhere else
         // think only - where ? (and why ?)
         printf("N=");
	 scanf ("%d",&numOfStars);
	  
         // think do you really need this branch ?
         // or you can live without it ?
	 // if (numOfStars != 9999)
	 // {
         for (int count=0; count < numOfStars; ++count)
             printf("*");               
         //}
      printf("\n");
      // something is missing here. Think - What is missing ?
      // maybe single operation with numOfStars variable ??
     }
      while (numOfStars != /* bad bad bad number 9999, think of any other - more useful number*/);

  system("PAUSE");	
  return 0;
}

I made useful hints in your example. The rest - you should find out yourself.

hello, thanks you for helping me,
but for wat question u answering??

i wanted to modify my code to get this result:

N=5
*****
 ****
  ***
   **
    *

manutd4life 0 Junior Poster · Answer 22 · 2010-04-22T00:58:59+00:00

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  	int numOfStars = 0;
	
	do
	{ 
         // it is bad place for print and scan.
         // move these 2 lines somewhere else
         // think only - where ? (and why ?)
         printf("N=");
	 scanf ("%d",&numOfStars);
	  
         // think do you really need this branch ?
         // or you can live without it ?
	 // if (numOfStars != 9999)
	 // {
         for (int count=0; count < numOfStars; ++count)
             printf("*");               
         //}
      printf("\n");
      // something is missing here. Think - What is missing ?
      // maybe single operation with numOfStars variable ??
     }
      while (numOfStars != /* bad bad bad number 9999, think of any other - more useful number*/);

  system("PAUSE");	
  return 0;
}

I made useful hints in your example. The rest - you should find out yourself.

Hello,
i know exactly how to do it i tries it but not working.
i need to input a number
and get the result

N=5
*****
****
***
**
*
Type Y if want to continue or N to stop
//i need to ask the user

here's my code:

#include <stdio.h>
#include <stdlib.h>

//procedure for star

void star_workout (void)
 {
    int numOfStars = 0;
    int count;
    
      printf("N=");
	  scanf ("%d",&numOfStars);

       for( ;numOfStars>0; numOfStars--)
        {
            for (count = 0;count < numOfStars; count++)
             {
                printf("*");
             }
             
            printf("\n");
        }
     }
     
//procedure to continue     
void cont_end (void)
{
     char ch;
     printf("Do you want to continue, Type Y or N ");
     scanf("%C",&ch);
 
     if (ch=="Y")
     {
      star_workout();        
     } 
     else
     {
         system("PAUSE");
         return 0;
         }
}

//The main program
int main(int argc, char *argv[])
{
    
    star_workout ();
    cont_end();
 
 system("PAUSE");
 return 0;
 }

thanks

Xufyan -4 Posting Whiz · Answer 23 · 2010-04-22T20:04:22+00:00

hey do you want to ask the user to restart a program on pressing Y ?
simply call the main()

if (ch=="Y" || ch=='y')
     {
      main();       
     } 
     else
     {
         exit();
     }

manutd4life 0 Junior Poster · Answer 24 · 2010-04-24T02:49:38+00:00

hey do you want to ask the user to restart a program on pressing Y ?
simply call the main()
if (ch=="Y" || ch=='y')
     {
      main();       
     } 
     else
     {
         exit();
     }

its not working
i tried this one

int main(int argc, char *argv[])
{
    int ch;
    
    printf("Enter 1 to continue or 0 to stop ");
    scanf("%c",&ch);
    if (ch==1)
    {
    star_workout ();
    }
    else
 system("PAUSE");
 return 0;
 }

when i enter 1
nothing happen, it just displayed

press any key to continue

it just dont enter in the if

Helps with loops

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