Lets rephrase:
You do add to variables se and so in a for loop. You might repeat that for loop within the dowhile. What are the actual numbers stored in so and se right before the for loop starts?
The user will input the number you want to enter. Then sample is if you enter 2. 1 "Enter Number:" will be out and you enter a number and 1 "Enter Number:" again and that is 2 numbers. Then the two entered numbers, odd are added and even are added together. Then if i'll repeat it using while loop the numbers inputted before added in the new entered numbers