The first one. The reason is that it will loop when i is 1,2 and 3 and will stop when i is 4 as i<4 becomes false thus looping 3 times.
The second one is not right as it will loop 4 times,namely when i is 0,1,2,3 and will stop when i is 4 as i<=3 becomes false.
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solved C programming Loops need explanation please [closed]