浙大pat考试第一题就错了

Question

include <stdio.h>
int main()
{
printf("hello world");
return 0;
}
提示
a.c:1:9: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘<’ token include <stdio.h> ^ 这是为啥呢

Answer 1

#include<stdio.h>