Write a for loop to sum all the integers between $1$ and $100.$

In $1784,$ Carl Gauss solved problem #$1$ in seconds by noticing that:

$1+99=100,2+98=100,3+97=100...($he was $7$ years old at the time.$)$

Write a for loop to compute the sum in #$1$ using approximately half the number of executions of the for loop in #$1.$