照着书上打的程序 ，提示error C2065: 'printf' : undeclared identifier，大佬帮忙看看，谢谢了

Question

# define N 8
void main()
{
int a[N]={43, 38, 55, 99, 72, 12, 27, 30 }, i, j, t;

printf("\nBefore sorted:\n");

for (i = 0; i < N; i++ )
printf("%5d", a[i]);
for (j = N-1; j > 0; j-- )
for (i = 0; i < j; j++)
if (a[i] > a[i+1])
{t = a[i]; a[i] = a[i+1]; a[i+1] = t;}

printf ("the sorted numbers:\n");
for (i = 0; i < N; i++ )
printf ("%d", a[i]);
printf("\n");
}

报错在第一个printf那行

Answer 1

printf函数属于 stdio.h库
请在首行加入 #include