Python基础（一）

1 counter = 1
2 while counter < 10:
3     print(counter)
4     counter += 1

1 counter = 1
2 result = 0
3 while counter < 101:
4     result += counter
5     counter += 1
6 print("sum of 1 to 100:", str(result))

1 counter = 1
2 print("odd numbers of 1 to 100:")
3 while counter < 101:
4     if counter % 2 == 1:
5         print(counter)
6     counter += 1

1 counter = 1
2 print("odd numbers of 1 to 100:")
3 while counter < 101:
4     if counter % 2 == 0:
5         print(counter)
6     counter += 1

1 counter = 1
2 result = 0
3 while counter < 100:
4     if counter % 2 == 1:
5         result += counter
6     elif counter %2 == 0:
7         result -= counter
8     counter += 1
9 print("sum of 1-2+3-4...+99:", str(result))