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read a variable # of ints from the keyboard into array

Posted on 1998-06-12
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Last Modified: 2011-04-14
I'm looking for a sample program that does exactly this:  gets called from the command line to read in a variable number of integers which get stored into an array.  After whatever manipulation (sorting, adding, multiplying various parts of the array) the array will be displayed back on the screen and the program ends.  Usage should be:
  FeedMe 383 22 82 99 1 93 3 82
for any amount of ints up to 100.  I'd like sample code for FeedMe.cc and FeedMe.h, as well as a sample compile on gcc.
This should be really simple and hopefully someone has it lying around and can post it asap.  Thanks.
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Question by:appleby
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6 Comments
 
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Expert Comment

by:jhance
ID: 1165770
How about this....


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LVL 11

Expert Comment

by:alexo
ID: 1165771
How about:

    #include <iostream.h>
    #include <stdlib.h>


    int Sum(int size, int* array)
    {
        int result = 0;
        for (int i = 0; i < size; ++i)
            result += array[i];

        return result;
    }


    int main(int argc, char* argv[])
    {
        if (argc < 2)
        {
            cout << "Usage: " << argv[0] << " <argument>..." << endl;
            return 1;
        }

        int i;

        int size = argc - 1;
        int* array = new int[size];
        for (i = 0; i < size; ++i)
            array[i] = atoi(argv[i + 1]);

        int result = Sum(size, array);

        cout << "Array: ";
        for (i = 0; i < size; ++i)
            cout << array[i];
        cout << endl;

        cout << "Result: " << result << endl;

        delete[] array;
        return 0;
    }

OK?
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LVL 32

Expert Comment

by:jhance
ID: 1165772
Oops, here's the code:

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

void main(int argc, char *argv[])
{
      // Make a place to store the ints
      if(argc < 2){
            fprintf(stderr, "Error, nothing specified\n");
            return;
      }

      int *Ints = new int[argc-1];
      for(int i=1; i<argc; i++){
            Ints[i-1] = atoi(argv[i]);
            printf("Argument #%d (%s) converted to %d\n", i-1, argv[i], Ints[i-1]);
      }
}
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Author Comment

by:appleby
ID: 1165773
I was going to comment that I get segmentation fault, but since I see that both suggestions are the same, it makes me think I have a typo or something.  But I don't see one.  Have you both tested these?
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Author Comment

by:appleby
ID: 1165774
Ok, I was just running an old file before fixing a typo.  Both are fine.  Thanks very much.  Alexo's answer did come through first (even if by mistake) and was more complete with the function example also.  I feel I should give him the grade.

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Accepted Solution

by:
alexo earned 280 total points
ID: 1165775
Great minds think alike :-)
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