我下载了一个DEVC++然后写入了
main()
{
 printf("HELLO WORLD!\n);
}
但是，DEVC++却报错：
[Error] F:\myfile\clanguage\test.cpp:1: stadio.h: No such file or directory
(这是C-FREE的，我以为是程序问题就换了C-FREE，结果还是一样）。

  F:\myfile\clanguage\test.cpp In function `int main()':
3 F:\myfile\clanguage\test.cpp `printf' undeclared (first use this function)
  (Each undeclared identifier is reported only once for each function it appears in.)

好像是PRINTF函数有问题
printf("hello world\n");
hello world 显示位红色

为什么引号" "会变成红色，里面的代码也变成了红色？？？

#include <stadio.h>
main()
{
      printf("hello world!\n");
}