# 打印1-10
# for i in range(1, 11):
#     print(i)

# 2.打印2,4,6,8,10
# for i in range(2, 12, 2):
#     print(i)
#

# 打印10-1
# for i in range(10, 0, -1):
#     print(i)


# 求1-100的和
# sum = 0
# for i in range(1, 101):
#     sum += i
# print(sum)
# # 求50-100的和
# sum = 0
# for i in range(50, 101):
#     sum += i
# print(sum)
# # 求1-1000的和
# sum = 0
# for i in range(1, 1001):
#     sum += i
# print(sum)


# 定义函数
def calcSum(beg, end):
    sum = 0
    for i in range(beg, end + 1):
        sum += i
    print(sum)
# 调用函数
calcSum(1, 100)
calcSum(50, 100)
calcSum(1, 1000)