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s=input("请输入待处理字符串:")
flag=True；n=0
i=0
while i<len(s):
if s[i]= ="a" and flag:
n+=1
flag=False
elif s[i]==" ": #s[i]是空格字符
flag=True
i+=1
print(n)
执行程序后，输入字符串“Python is a computer programming language that I really like!”，输出的结果是（ ）
| A．3 | B．4 | C．5 | D．6 |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
