Thread: need c program

  1. #1
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    need c program

    Hello world,

    I would be very gracefull if someone could send me a program with some math algorithms, which calculates smth (no matter what) but do it long, for some seconds. Please help for c newbie.

    Thanks

  2. #2
    C++ Witch laserlight's Avatar
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    Here you go:
    Code:
    #include <time.h>
    
    int main(void)
    {
        time_t start = time(0);
        while (difftime(time(0), start) < 3);
        return 0;
    }
    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
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    Code:
    #include <stdlib.h>
    #include <stdio.h>
    #include <ctype.h>
    #include <string.h>
    
    int main(){
    	int i;
    	int j;
    	int k;
    	for(i = 0; i < 30000; i++)
    		for(j = 0; j < 30000; j++)	
    			for(k = 0; k < 30000; k++){
    			}
    	printf("%d", 1+1);
    	return 0;
    }
    This calculates the number 2 (as the sum of 2 integers) but it takes a while to do so.

  4. #4
    ATH0 quzah's Avatar
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    Quote Originally Posted by hilarius View Post
    Code:
    #include <stdlib.h>
    #include <stdio.h>
    #include <ctype.h>
    #include <string.h>
    
    int main(){
    	int i;
    	int j;
    	int k;
    	for(i = 0; i < 30000; i++)
    		for(j = 0; j < 30000; j++)	
    			for(k = 0; k < 30000; k++){
    			}
    	printf("%d", 1+1);
    	return 0;
    }
    This calculates the number 2 (as the sum of 2 integers) but it takes a while to do so.
    You might want to do something inside the loop, otherwise your compiler may just optimize all three loops away to nothing.
    Code:
    while( time( NULL ) != -1 )
        printf("thinking...\n");
    printf("got it! 1+1 is %d!\n", 1+1 );
    Quzah.
    Hope is the first step on the road to disappointment.

  5. #5
    Hurry Slowly vart's Avatar
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    Quote Originally Posted by hilarius View Post

    This calculates the number 2 (as the sum of 2 integers) but it takes a while to do so.
    And maybe not - if compile optimization is on
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  6. #6
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    Aww... this thread is becoming like my nickname....

  7. #7
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    thanks for that

    But it be nice if code would be ~100 or more lines..

  8. #8
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by auryc
    But it be nice if code would be ~100 or more lines..
    Looks like you did not get the drift. Read the homework guidelines and do your own homework before asking for help.

    *thread closed*
    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

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