Sum From 1 to 100

Use a loop to add together every whole number from 1 to 100 (that is, 1 + 2 + 3 + ... + 100) and print the single final total. The trick is to keep a running total in a variable that starts at 0, add the current number to it on every pass of the loop, and then print that total only once, after the loop has completely finished.