wondering why output is for a on first print is 2686780

This is a discussion on wondering why output is for a on first print is 2686780 within the C Programming forums, part of the General Programming Boards category; Code: #include <stdio.h> #include <stdlib.h> int f(int *d, int c, int b, int *a); int main(void){ int a=1, b=3, c=2, ...

  1. #1
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    wondering why output is for a on first print is 2686780

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    int f(int *d, int c, int b, int *a);
    int main(void){
        int a=1, b=3, c=2, d=4, e=5;
        e = f(&a, f(&b,a,e,&c), e, &d);
        printf("a =%d b=%d c=%d d=%d e=%d\n", a, b, c, d, e);
        system("pause");
        return 0;
    }
    int f(int *d, int c, int b, int *a) {
        
        *a = *a + 1;
         c = c + (*a);
         b = b + c;
        *d = *a + 2;
        printf("a = %d, b = %d, c = %d, d = %d\n", a, b, c, d);
        return *d - *a + 2;
    }
    This was a test question we had on the test and i believe the real output is
    a=3 b=9 c=4 d=5
    a=5 b=14 c=9 d=7
    a=7 b=5 c=3 d=5 e=4

    I was wondering if anybody could find a reason why when i output it on my computer then i get
    a = 2686780, b = 9 c = 4, d = 2686784
    a = 2686776 b = 14 c = 9 d = 2686788
    a = 7 b = 5 c=3 d=5 e = 4

    bascially why in the function is a and d crazy... i imagine its something to do with the * and & might be messed up...just curious is all.

  2. #2
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by dl27
    bascially why in the function is a and d crazy... i imagine its something to do with the * and & might be messed up...
    Yeah, in function f, a and d are pointers. Since you want to print what they point to, you should have written:
    Code:
    printf("a = %d, b = %d, c = %d, d = %d\n", *a, b, c, *d);
    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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