Changing Values of a Row in a 2D Array Using For Loops

Question

I have a function called zero_row. This function inserts the value of zero into all a row that is specified. The function takes to variables. a (the array) and row (the row in the array). Here is my function

void zero_row (int a [4][5], int row){
    for (int i = 0; i < 4; i++) {
        a[i][j] = 0;
    }
}

I know how to set values of the entire array to zero. As i have a function to do this as well.

void zero_all (int a [4][5]) {
    for (int i = 0; i < 4; i++) {
        for (int j = 0; j < 5; j++) {
            my_arr[i][j] = 0;
        }
    }
}

I cant seem to figure out how to do this using the variable row. I want to use this variable so I can later change the row in my main function, like so: zero_row(a, 3);. Can anyone help?

Thanks!

R Sahu · Accepted Answer · 2016-09-21 22:26:15Z

1

In your case the first index corresponds to a row and the second index corresponds to a column.

Use

void zero_row (int a [4][5], int row){
    for (int j = 0; j < 5; j++) {  // 5 instead of 4
        a[row][j] = 0;
    }
}

answered Sep 21, 2016 at 22:26

R Sahu

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