<2>python_while,if,for

# 1、使用while循环输出123456 8910
"""num =0
while num <10:
    num += 1
    if num==7:
        print(" ")
    else:
        print(num)"""
# 2、输出1234568910
"""num =0
while num <10:
    num += 1
    if num == 7:
        continue
    print(num)"""

# 3、求1-100所有整数的和
num = 1
sum = 0
while num < 101:
    sum += num
    num += 1
print(sum)

# 4、输出1-100中所有奇数
num = 1
while num < 101:
    if num % 2 ==1:
        print(num)
    num += 1

a="changcheng"

# for word in a:
#     print(word)

index = 0
while a:
    print(a[index])
    index += 1
    if index == len(a):
        break