Array Program

This is a discussion on Array Program within the C Programming forums, part of the General Programming Boards category; I have to write a program that deals with arrays. I think I am doing this totally wrong. Do I ...

  1. #1
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    Array Program

    I have to write a program that deals with arrays. I think I am doing this totally wrong. Do I need a for loop to do the increment?

    Code:
        11
        12  Write a C program (named pe4.c) will prompt
        13  the user for  10 ints, each in the range
        14  0 - 9 inclusive.
        15
        16  Compute a histogram for these 10 numbers (e.g.
        17  determine how many times each number occurred.
        18  Display the list in the format shown below.
        19  See 'pe4.exe' for the output format.
        20
        21  HINT: to solve this problem, create an int array
        22  of size 10. Initialize the array to all zeroes.
        23  When a value is entered, increment the array
        24  element whose subscript is the same as the value entered.
        25  Finally, display the resulting array.
        26  After the display of the histogram,
        27  you program should output: PROGRAM ENDS followed
        28  by a newline character.
        29
        30
        31  ASSUMPTIONS: all values entered are C ints in
        32  the range 0-9 inclusive.  You do not have to
        33  check that values are in this range.
        34
        35
        36  EXAMPLE:
        37
        38  Enter value: 9
        39  Enter value: 0
        40  Enter value: 0
        41  Enter value: 1
        42  Enter value: 1
        43  Enter value: 8
        44  Enter value: 2
        45  Enter value: 8
        46  Enter value: 8
        47  Enter value: 0
        48  Histogram: 3 2 1 0 0 0 0 0 3 1
        49  PROGRAM ENDS
        50
        51  This example shows that the user entered
        52  3 zeroes, 2 ones, 1 two, no threes, no fours,
        53  no fives, no sixes, no sevens, 3 eights, and 1
        54  nine.
    I have this and I think I went in the wrong direction:

    Code:
         7  #include <stdio.h>
         8  #define N 10
         9
        10  int main (void)
        11
        12  {
        13
        14  int a[10] = {0};
        15
        16  printf("Enter value: ");
        17  scanf("%d", &a[0]);
        18  printf("Enter value: ");
        19  scanf("%d", &a[1]);
        20  printf("Enter value: ");
        21  scanf("%d", &a[2]);
        22  printf("Enter value: ");
        23  scanf("%d", &a[3]);
        24  printf("Enter value: ");
        25  scanf("%d", &a[4]);
        26  printf("Enter value: ");
        27  scanf("%d", &a[5]);
        28  printf("Enter value: ");
        29  scanf("%d", &a[6]);
        30  printf("Enter value: ");
        31  scanf("%d", &a[7]);
        32  printf("Enter value: ");
        33  scanf("%d", &a[8]);
        34  printf("Enter value: ");
        35  scanf("%d", &a[9]);
        36
        37  printf("a[%d]");
        38  printf("PROGRAM ENDS\n");
        39
        40  return 0;
        41  }

  2. #2
    CSharpener vart's Avatar
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    you need to read about loops
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  3. #3
    ---
    Join Date
    May 2004
    Posts
    1,379
    by the way, the point of
    Code:
    #define N 10
    is so you can do this
    Code:
    int a[N] = {0};
    It's bad practice to hard code constants. Now, as the above poster said, go read about loops like you already should have...

  4. #4
    Cogito Ergo Sum
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    Quote Originally Posted by vart View Post
    you need to read about loops
    Exactly, lol
    =========================================
    Everytime you segfault, you murder some part of the world

  5. #5
    Jack of many languages Dino's Avatar
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    Hi Alex. I spent quite a bit of time composing a "for loop" tutorial for you in this thread. Please go back and review.

    Help writing a program

    Todd
    Mac and Windows cross platform programmer. Ruby lover.

    Quote of the Day
    12/20: Mario F.:I never was, am not, and never will be, one to shut up in the face of something I think is fundamentally wrong.

    Amen brother!

  6. #6
    Cogito Ergo Sum
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    Your printf("a[&#37;d") is missing a variable in which to read the integer value to print.

    printf("a[%d", x);

    is more like it
    =========================================
    Everytime you segfault, you murder some part of the world

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