Trouble with array in function

By : user4580059

Date : November 28 2020, 09:01 AM

This might help you You need to pass your array rowavg[] or make it global.
Here is some correction:

code :

#include <stdio.h>

void row_average(int vals2d[][4], int rows, int cols, float rowavg[])
{
    int k, l, sum;
    float avg;
    for (k=0; k<rows; k++){
        sum = 0;
        avg = 0;
        for (l=0; l<cols; l++){
            sum = sum + vals2d[k][l];
            avg = (float)sum/4;
        }
        rowavg[k] = avg;
        printf("%.2f  ", rowavg[k]);
    }
}

void array_1display(float rowavg[], int size)
{
    int m;
    for (m=0; m<size; m++){
        printf("%.3f  ", rowavg[m]);
    }
}

int main()
{
    float rowavg[6];

    int vals2d[6][4] ={
            {12,54,34,45},
            {68,76,65,23},
            {75,23,76,34},
            {6,45,58,59},
            {35,67,93,12},
            {66,90,25,7}
        };

    row_average(vals2d, 6, 4, rowavg);
    printf("\n");
    array_1display(rowavg, 6);
}

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Having trouble passing array to function

By : Lucas Carmona Ampuer

Date : March 29 2020, 07:55 AM

it fixes the issue This looks like a school assignment and I applaud you for not asking for the answer. There are several ways to do it, but you are already fairly close in the approach that you are using. When you pass an array reference, you do not want to include the length of the array. For example, the parameter int score[100] should be int score[]. The exception, especially in your scenario, is with multidimensional arrays. In this case, you want to use char playerName[][20]. Your function declaration also needs to change to match. Don't forget InputData returns an int. Your declarations and function call are correct; you just need to adjust your function signature.

Array and function trouble

By : Ronald

Date : March 29 2020, 07:55 AM

I wish did fix the issue. You are setting the value of the string only at the start of your main routine. You need to set it after the ThreeResults are set. Strings are immutable objects, so your code would not work.

code :

Module Module1

Sub Main()
    'Declare Variables
    Dim UserAnswer As String = "nothing"
    Dim UserTokens As String
    Dim ThreeResults(2) As String
    Dim Result1 As String
    Dim Result2 As String
    Dim Result3 As String

    'Ask user for number of tokens
    Console.WriteLine("Enter the number of tokens that you want to gamble with (minimum of 1 token)")
    UserTokens = (Console.ReadLine())

    UserTokens = ValidateTokens(UserTokens)

    Do Until UserAnswer = "no"
        ThreeResults = GenerateNumbers()
        Result1 = ThreeResults(0)
        Result2 = ThreeResults(1)
        Result3 = ThreeResults(2)

        UserAnswer = DisplayResults(UserTokens, UserAnswer, Result1, Result2, Result3)
    Loop

End Sub

Function ValidateTokens(ByVal UserTokens)

    Dim dblUserTokens As Double

    Do Until IsNumeric(UserTokens)
        Console.Write("Sorry you did not enter a valid number.  Please try again.   ")
        UserTokens = Console.ReadLine()
    Loop

    'Make sure the user entered in a positive number
    dblUserTokens = CDbl(UserTokens)
    Do Until dblUserTokens > 0
        Console.Write("Sorry you did not enter in a positive number.  Please try again.   ")
        UserTokens = Console.ReadLine()

        'Make sure the user entered in a number
        Do Until IsNumeric(UserTokens)
            Console.Write("Sorry you did not enter a valid number.  Please try again.   ")
            UserTokens = Console.ReadLine()
        Loop
        dblUserTokens = CDbl(UserTokens)


    Loop

    Return UserTokens
End Function

Function GenerateNumbers()
    Dim results(2) As String
    Dim names(5) As String
    Dim x As Integer

    names(0) = "Cherries"
    names(1) = "Oranges"
    names(2) = "Plums"
    names(3) = "Bells"
    names(4) = "Melons"
    names(5) = "Bar"

    For x = 0 To 2
        results(x) = names(CInt(Int((5 * Rnd()) + 1)))
    Next x

    Return results
End Function



Function DisplayResults(ByRef UserTokens, ByVal UserAnswer, ByRef number1, ByRef number2, ByRef number3)
    Console.WriteLine("*** " & number1 & " ** " & number2 & " ** " & number3 & " ***")
    If UserTokens > 0 Then
        Console.WriteLine("You have " & UserTokens & " tokens left, do you want to play again? (yes or no)")
        UserAnswer = (Console.ReadLine())
    Else
        Console.WriteLine("Sorry, you lost all of your tokens!")
    End If

    Return UserAnswer
End Function


End Module

Having trouble with function pointers and array

By : user4369812

Date : March 29 2020, 07:55 AM

may help you . I am currently using Visual Studios for class and needless to say I am having difficulty understanding pointers. I have created a program but does not seem to work right for me. I keep getting an assertion error after I click the function type that I want. I get a Debug assertion failed pop up error. Expression: result_pointer != nullptr. It says line 1558 , This is why your code fails:

code :

scanf_s("%d", choice);

scanf_s("%d", &choice);

JavaScript: Creating a function to reject array elements found to be truthy, trouble with values in objects in the array

By : Zelka

Date : March 29 2020, 07:55 AM

around this issue Here's the solution I ended up with. To clarify, the tests were passing in arrays and objects, so that's why I first had trouble (with the objects) and then there was some confusion in in the answers. I wrote:

code :

function reject(collection, callback) {
    if(Array.isArray(collection)){
        for (var i = 0; i < collection.length; i++) {
            if(callback(collection[i]) === true){
                collection.splice(i, 1);
            }
        }
    } else {
        for (number in collection){
            if(callback(collection[number]) === true){
                delete collection[number];
            }
        }
    };

    return collection;
}

I'm having trouble in C++ geting input from a user in a function, adding to an array, and printing that array

By : S.C.J

Date : March 29 2020, 07:55 AM

hope this fix your issue Your fundamental problem is that int getFourNums() can only return a single integer, not an array of them. The next problem is that functions cannot return raw arrays for historical reasons. Your choices are to return a std::array, a struct containing the array, pass the array by reference into the function, or return a std::vector. My preference for this application is a std::vector - it is flexible, and although not quite as efficient as std::array, you should probably default to std::vector unless you have a good reason otherwise. Your getNums code would then look like:

code :

std::vector<int> getFourNums() {
    std::vector<int> result;
    cout << "Enter 4 nums: ";
    for(int i = 0; i < 4; i++){
        int v;
        cin >> v;
        result.push_back(v);
    }
    return result;
}