c - 带关系运算符的 while 循环

Question

int I;
I=0;
while ((CH1[I]=CH2[I]) != '\0')
      I++;
puts(CH1);

这个程序是把CH2复制到CH1中，但是我不明白循环条件(CH1[I]=CH2[I]) != '\0')？

Answer 1

while 循环条件包含两部分:

CH1[I]=CH2[I] // this is an assignment that copies character at Ith position in array CH2 into array's CH1 Ith position
(...something...) != '\0' // checks if 'something' is not equal to '\0', the string termination character.

因此 while((CH1[I]=CH2[I]) != '\0') 一次将一个字符从 CH2 复制到 CH1 并在复制到“\0”时立即中断，这意味着已到达字符串末尾并且没有更多字符可供复制。