pointers

This is a discussion on pointers within the C Programming forums, part of the General Programming Boards category; Write a program which sets up two arrays inside main. The arrays should be the same size. One array must ...

  1. #1
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    pointers

    Write a program which sets up two arrays inside main. The arrays should be the same size. One array must be initialised to some arbitrary values. The other array does not need to be initialised. Pass pointers to the arrays to a function called copystuff() which will copy the elements of the first array into the second array. The function need not return a value, unless you want it to. Main() must then print out the two arrays.

    #include <stdio.h>
    int copy_stuff (int [ ], int [ ]);
    void main (void)
    {
    int a[5]={1,2,3,4,5},b[5];
    copy_stuff(a,b);
    printf("%d",b);
    }
    int copy_stuff (int x[], int y[])
    {
    int *pointer;
    pointer = &x;
    y = *pointer;
    return y;
    }

  2. #2
    Has a Masters in B.S.
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    that actually only changes a pointer it does not coby a to b

    this will copy a to b

    Code:
    void copy_stuff(int x[],int y[])
    {
        for(int i = 0;i < 5;i++)
            y[i] = x[i];
    }
    ADVISORY: This users posts are rated CP-MA, for Mature Audiences only.

  3. #3
    Mayor of Awesometown Govtcheez's Avatar
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    OK, that's a little better.
    Code:
    #include <stdio.h> 
    void copy_stuff (int [ ], int [ ]); 
    int main (void)    /* Main returns an int, not void */
    { 
       int a[5]={1,2,3,4,5},b[5]; 
       copy_stuff(a,b); 
       printf("%d",b);    /*This isn't how to print an array - I'll let you figure that one out*/
       return 0;
    } 
    void copy_stuff (int *x, int *y) 
    { 
       for (int i = 0; i < 5 ; i++)
          y[i] = x[i];
    }
    (Or use no-one's)

  4. #4
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    A very simple function to print those arrays:

    #include <stdio.h>
    void copy_stuff (int [ ], int [ ]);
    void array_printer(int *, int *);
    int main (void) /* Main returns an int, not void */
    {
    int a[5]={1,2,3,4,5},b[5];
    copy_stuff(a,b);
    array_printer(a,b);
    return 0;
    }
    void copy_stuff (int *x, int *y)
    {
    for (int i = 0; i < 5 ; i++)
    y[i] = x[i];
    }
    void array_printer(int *x, int *y)
    {
    int i;
    for(i=0;i<5;i++)
    printf("\n %d\t%d",x[i],y[i]);
    }

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