How to make C++ program that gets the sum of even columns in 2d arrays?

actually ive already started it but in the adding part when i print sum it displays wrong sum





2 x 4 array


i = 2


j = 4





~~~~





for(i=0;i%26lt;=1;i++)


{ for(j=0;j%26lt;=3;j++)


p("a[%d,%d]", i+1, j+1)


scans for elements~


}





for(i=0;i%26lt;=1;i++)


{ for(j=0;j%26lt;=3;j++)


x=j % 2


if(x==0)


sum = sum + a[i][j]


else


sum = sum + 0


}


p(%d, sum)





i cant find the problem

How to make C++ program that gets the sum of even columns in 2d arrays?
This looks like homework so I am just going to give a couple of hints.





First, it looks like you are missing a set of curly braces '{'.





for(i=0;i%26lt;=1;i++)


{ for(j=0;j%26lt;=3;j++)


Insert Opening Curly Brace Here


x=j % 2


...





Second, look into using j+=2 rather than just j++ in the inner for loop. This will allow you to work with only the even columns and never even see the odd ones simplifying your code.





Good luck
Reply:I have created some variables (numColumns and numRows) that you will have to fill with the correct value, but here is the general process:





Loop through every other column, starting at 0 (so 0, 2, 4...) and for each column you loop through, loop through each row (so 0, 1, 2, 3...) and add the value for that column/row combination to your sum.





sum = 0;


for (int i = 0; i %26lt; numColumns; i += 2)


{


for (int j = 0; j %26lt; numRows; j++)


{


sum += a[i][j];


}


}


p(%d, sum)