Beginner · For loops · 78 of 264
Count the positives
Read n numbers and count how many of them are greater than zero.
Input: n on the first line, then n whole numbers, one per line. Output: how many are positive.
Examples
Input
5 1 -2 3 0 4
Output
3
Input
2 -1 -1
Output
0
Input
3 0 0 5
Output
1
One more test checks other inputs when you press Check.
Stuck? The idea behind for loops
A for loop repeats its indented lines once for each item: each letter of a string, each item of a list, or each number of a range.
range(5) is 0 to 4; range(1, 6) is 1 to 5; range(10, 0, -1) counts down from 10 to 1.
total = 0
for i in range(1, 6):
total += i
print(total) # 15Watch for: range stops before its end: range(1, n) leaves out n. A print inside the loop prints every time; outside it (not indented), once at the end.