check every condition

This is a discussion on check every condition within the C Programming forums, part of the General Programming Boards category; i made one loop which has another loop inside it like this: Code: for(y=1;y<11;y+=1){ for(x=0;x<5000;x+=1){ if (x % y==0){ printf("%d ...

  1. #1
    Registered User
    Join Date
    Mar 2009
    Posts
    28

    check every condition

    i made one loop which has another loop inside it like this:
    Code:
    	for(y=1;y<11;y+=1){
    		for(x=0;x<5000;x+=1){
    			if (x % y==0){
    				printf("%d \n",x);}}}
    when i run it tries the if condition indiviually b ut i am trying make it try for every "y"
    how can i do it?

  2. #2
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Location
    Singapore
    Posts
    23,617
    Quote Originally Posted by alperen1994
    when i run it tries the if condition indiviually b ut i am trying make it try for every "y"
    As in you want to print all non-negative integers less than 5000 that are perfectly divisible by all the positive integers less than 11?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    spurious conceit MK27's Avatar
    Join Date
    Jul 2008
    Location
    segmentation fault
    Posts
    8,300
    Quote Originally Posted by alperen1994 View Post
    i am trying make it try for every "y"
    how can i do it?
    It is. Maybe you wanted this in the printf to make that clearer:
    Code:
    printf("x=%d y=%d\n",x,y);
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  4. #4
    Registered User
    Join Date
    Mar 2009
    Posts
    28
    Quote Originally Posted by laserlight View Post
    As in you want to print all non-negative integers less than 5000 that are perfectly divisible by all the positive integers less than 11?
    i want the all numbers between 0-50000 that can divided with all numbers between 0-11

  5. #5
    "I Win!" by U. Lose vart's Avatar
    Join Date
    Oct 2006
    Location
    Rishon LeZion, Israel
    Posts
    6,754
    Quote Originally Posted by alperen1994 View Post
    i want the all numbers between 0-50000 that can divided with all numbers between 0-11
    so make outer loop for x
    and inner loop for y - and make a flag to check if you have some y tht is not devideble by...

    and print only x for which flag is not set
    To be or not to be == true

  6. #6
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Location
    Singapore
    Posts
    23,617
    Quote Originally Posted by alperen1994
    i want the all numbers between 0-50000 that can divided with all numbers between 0-11
    I take that as a "yes, but the 5000 should be 50000", in which case note that the program that you posted has 5000 whereas you want 50000.

    Basically, a fix to your current code would be to make the loop that loops from x in the range [0, 50000) be the outer loop. In the inner loop, you check for divisibility, and if you find that x % y != 0, then you know that the current value of x should not be printed. If the inner loop is done and at no point is x % y != 0, then you print the current value of x and move on to the next.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  7. #7
    The larch
    Join Date
    May 2006
    Posts
    3,573
    Or determine a step by which to increment the number and just print the values.

    If I'm not mistaken all these numbers are 0 and 27720.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  8. #8
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Location
    Singapore
    Posts
    23,617
    Quote Originally Posted by anon
    If I'm not mistaken all these numbers are 0 and 27720.
    hmm... how did you get 27720? I reasoned that if we accounted for multiples of 8, we would cover 2 and 4. Unfortunately, I computed it as 3 * 8 * 5 * 7 * 9 = 7560, forgetting that the same reasoning that applies for 8 covering for 2 and 4 applies for 9 covering for 3. We do not need to worry about 6 and 10 since they are covered by 8, 9 and 5. As such, the sequence would be multiples of 8 * 9 * 5 * 7 = 2520, and brute force testing confirms that.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  9. #9
    The larch
    Join Date
    May 2006
    Posts
    3,573
    I also included 11...
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  10. #10
    and the Hat of Guessing tabstop's Avatar
    Join Date
    Nov 2007
    Posts
    14,185
    Quote Originally Posted by anon View Post
    I also included 11...
    The OP didn't. Whether that's a flaw in the posted code or the posted explanation will have to wait for OP.

    Edit: To be more clear, the OP said "between 0-11" and checked 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. Whether 11 was supposed to be included I can't say.
    Last edited by tabstop; 03-21-2009 at 03:36 PM.

Popular pages Recent additions subscribe to a feed

Similar Threads

  1. BN_CLICKED, change button style
    By bennyandthejets in forum Windows Programming
    Replies: 13
    Last Post: 07-05-2010, 11:42 PM
  2. pLease check my programming~~
    By iedchan in forum C++ Programming
    Replies: 2
    Last Post: 04-15-2007, 10:23 AM
  3. Please check this loop
    By Daesom in forum C++ Programming
    Replies: 13
    Last Post: 11-02-2006, 12:52 AM
  4. get and check input as while condition
    By Marksman in forum C++ Programming
    Replies: 7
    Last Post: 09-29-2006, 09:22 PM
  5. how to check for end of line in a text file
    By anooj123 in forum C++ Programming
    Replies: 6
    Last Post: 10-24-2002, 11:21 PM

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21