size(400, 400);
background(255);

fill(0); 

int maxNum = 9;
int sumOfOdds = 0;

// draw labels 
text("Even numbers: ", 15, 50);
text("Sum of odd nummbers: ", 15, 80);

for(int val=0; val <= maxNum; val++) {
  if((val % 2) == 0) { // even number; draw it on canvas
    text(val, 100 + (val * 10), 50); 
  } else { // odd number; add it to sum
    sumOfOdds += val;
  }   
}  

text(sumOfOdds, 145, 80); // draws the sum of odd numbers

save("activity10.png");