warning:suggest parentheses around assignment used as truth value

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错误代码
warning:suggest parentheses around assignment used as truth value
错误原因
我们经常将“==”写为“=”
解决

while(*dest++ = *src++)
改为
while((*dest++ = *src++))

明确地告诉编译器它是"=“而不是”=="

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32. 最长有效括号