Adding 2 dimensional array rows

Question

for (row=0; row<8; row++)
    {
        for (col=0; col<8; col++)
        {
            answer+=my_data[row][col];
        }
        printf("The sum of row %i is: %i\n", row,answer);
        answer = 0;//to reset answer back to zero for next row sum 
    }

I have an 8x8 array and I'm adding each row and resetting the answer back to zero so you get the exact answer for each row. However it's not working... What is wrong?

When you say not working, what exactly is not working? compilation error? strange value coming out? etc. also how are answer,row,col declared? — AndersK
– AndersK, Commented Mar 2, 2011 at 6:21
No I did not. Thanks for catching my error haha I forgot to initialize it to zero! — Kyle
– Kyle, Commented Mar 2, 2011 at 6:26

codaddict · Accepted Answer · 2011-03-02 06:22:33Z

4

How is answer declared ?

If it is declared without an initial value then your existing code will fail as answer will have junk value for 1st row. To fix this :

for (row=0; row<8; row++) {
        answer = 0; // clear the running sum.
        for (col=0; col<8; col++) {
            answer+=my_data[row][col];
        }
        printf("The sum of row %i is: %i\n", row,answer);       
}

answered Mar 2, 2011 at 6:22

codaddict

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Comments

Kyle · Accepted Answer · 2011-03-02 06:27:29Z

0

Forgot to initialize answer to zero in the beginning of the program.

int answer = 0;

Thanks Gunner and Pedro.

answered Mar 2, 2011 at 6:27

Kyle

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