求C程序：能够进行四则运算和九九乘法表。

#include "stdio.h"
#include "conio.h"
#include "stdlib.h"
#include <time.h>
void main()
{
int n,x,i,j,k,l,m,v;
while(1)
{
meun:clrscr();
printf("\n\n");
printf(" *************************************************** ");
printf("\n Arithmetic Exercise System of Pupil ");
printf("\n *************************************************** ");
printf("\n 1.Addition Exercise ");
printf("\n 2.Subtract Exercise ");
printf("\n 3.Multiplication Exercise ");
printf("\n 4.Division Exercise &qu