Calculating an average

This is a discussion on Calculating an average within the C Programming forums, part of the General Programming Boards category; Hey, I am new to C and need to make a console app that allows a user to enter as ...

  1. #1
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    Calculating an average

    Hey,

    I am new to C and need to make a console app that allows a user to enter as many payments as they like and when a command say "STOP" is entered it calculates the average of the numbers they entered. Could some tell me the best way to achieve this....Would it be with an array, loop or something else.

    P.S I have a couple of manuals but am not sure what I should be looking for.

    Thanks

    Andy

  2. #2
    cwr
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    If you only need the average, you could keep a running total and a count of the number of items and divide the running total by the number of items when they've finished inputting the numbers.

  3. #3
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    U can use FOR command !
    Ex:
    Code:
    For(i=0;i<n;,i++)
    {
       printf("type %d number:",i);
       scanf("%d",&i);
    }
       sum=0
       for(i=0;i<n;i++)
       sum = sum + i;
    
       printf("Avarage is %d",sum/n);
    That is simple code !

  4. #4
    Devil's Advocate SlyMaelstrom's Avatar
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    Quote Originally Posted by duochon
    U can use FOR command !
    Ex:
    Code:
    For(i=0;i<n;,i++)
    {
       printf("type %d number:",i);
       scanf("%d",&i);
    }
       sum=0
       for(i=0;i<n;i++)
       sum = sum + i;
    
       printf("Avarage is %d",sum/n);
    That is simple code !

    First off, it's for, not For. Secondly, why would you read into your control variable in a count control loop?
    Sent from my iPadŽ

  5. #5
    cwr
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    To the OP, please completely ignore duochon's post, in case you're tempted not to. If they actually tested the code they gave, they'd not have posted it.

  6. #6
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    Yeah, ditto what cwr and sly said. Don't bother reading his post. But do try using a for loop, then show us what you come up with and we'll be happy to help you work through the problem.
    -Crazed

  7. #7
    Devil's Advocate SlyMaelstrom's Avatar
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    It's tough to flat out say, "Use a for loop", especially with the way he want to sum. If you're talking about an undefined amount of user input, then a while or do while loop would suit you better.
    Sent from my iPadŽ

  8. #8
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    Oop my bad. You're right Sly it would be best to use a while loop for that, but, it would still be possible to do it using an infinite loop with a break statement.
    -Crazed

  9. #9
    Its hard... But im here swgh's Avatar
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    Try this:

    Code:
    #include <stdio.h>
    
    int main()
    {
    int average;
    int counter = 1;
    int total = 0;
    int num;
    
    while ( counter <= 25 )
    {
    printf("Enter an amount: ");
    
    scanf("%d", &num);
    
    total = total + num;
    
    counter++;
    }
    
    average = total / 10;
    
    printf("\nThe average is %d, average);
    
    getchar();
    
    return 0;
    }

  10. #10
    Its hard... But im here swgh's Avatar
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    EDIT

    Sorry, last line of code should read:

    Code:
    printf("\nThe average is %d", average);

  11. #11
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    That's not what he asked:
    when a command say "STOP" is entered
    Operating Systems:
    - Ubuntu 9.04
    - XP

    Compiler: gcc

  12. #12
    Devil's Advocate SlyMaelstrom's Avatar
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    Yeah seriously, and if you were just going to write a count controlled while loop, I would have said to use a for loop.
    Sent from my iPadŽ

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