c语言循环练习平时训练

Question

有声明int i=0,s=0;执行下列程序段后s的值为
while(i++ < 6) s += i;
A、15
B、16
C、21
D、22

Answer 1

分步：
i = 0, i < 6 , i++ ==> i = 1 , s+=i ==> s += 1 = 1
i = 1, i < 6, i++ ==> i = 2, s+=i ==> s += 2 = 3
i = 2, i < 6, i++ ==> i = 3. s+=i ==> s += 3 = 6
i = 3, i < 6, i++ ==> i = 4, s+=i ==> s+= 4 = 10
i = 4, i < 6, i++ ==> i = 5, s+=i ==> s+= 5 = 15
i = 5, i < 6, i++ ==> i = 6, s+=i ==> s+= 6 = 21
i = 6, i < 6 条件不成立退出循环, i++ ==> i = 7