C編譯報錯: implicit declaration of function xxx is invalid in C99 [-Wimplicit-function-declaration]

C編譯報錯: implicit declaration of function xxx is invalid in C99 [-Wimplicit-function-declaration]c++ 代碼文件 test.c，內容以下:web #include <stdio.h> int main() { // 個人第一個 C 程序 printf("Hello, World! \n"

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