1. warning: incompatible implicit declaration of built-in function 'strlen'
解決方案： #include<string.h>
2. client.c:61: warning: passing argument 1 of 'snprintf' from incompatible pointer type
解決方案： 資料類型定義錯誤，是char 而不是 int
1. warning: incompatible implicit declaration of built-in function 'strlen'
解決方案： #include<string.h>
2. client.c:61: warning: passing argument 1 of 'snprintf' from incompatible pointer type
解決方案： 資料類型定義錯誤，是char 而不是 int
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