The C language summary of the freshman semester

Freshman of the last semester to learn some of the C language summary. Very small Pediatrics. I don't know what else to do except arithmetic C. This semester learned some C + + knowledge to add, copied over:

#include <stdio.h>
#include <conio.h>
#include <iostream>
#include <process.h>
#include <time.h>
using namespace Std;
void Main ()
{
void Math ();
void Max ();
void Me ();
void Tuxing ();
void Panduan ();
void time ();
int input;
A:system ("CLS");
printf ("Input 1 uses mathematical function/n");
printf ("Enter 2 uses maximum function/n");
printf ("Enter 3 to display a graph of figures/n");
printf ("Input 4 use judgment function/n");
printf ("Input 0 about author/n");
cout<< "Enter 8 show current Time" <<endl;
cout<< "Enter 9 exit this program" <<endl;
scanf ("%d", &input);
if (input==1) math ();
if (input==2) max ();
if (input==3) tuxing ();
if (input==4) Panduan ();
if (input==0) Me ();
if (input==9) exit (1);
if (input==8) time ();
Goto A;
Getch ();
}

void Math ()
{
float X,y,jia,jian,cheng,chu;
cout<< "Enter two digits" <<endl;
cin>>x>>y;
Jia=x+y;
cout<<x<< "+" <<y<< "=" <<jia<<endl;
Jian=x-y;
cout<<x<< "-" <<y<< "=" <<jian<<endl;
Cheng=x*y;
cout<<x<< "*" <<y<< "=" <<cheng<<endl;
chu=x/y;
cout<<x<< "/" <<y<< "=" <<chu<<endl;

Getch ();
}

void Max ()
{
int z,x,y;
printf ("Enter two digits (hint: with space interval)/n");
scanf ("%d" "%d", &x,&y);
if (x>y)
Z=x;
Else
Z=y;
cout<<x<< "and" <<y<< "the biggest is" <<z<<endl;
Getch ();
}

void Tuxing ()
{void Tuxing_chengfabiao ();
void Tuxing_yanghuisanjiao ();
int input;
printf ("Input 1 shows 99 multiplication table/n");
printf ("Input 2 shows Yang Hui's triangle/n");
scanf ("%d", &input);
if (input==1) Tuxing_chengfabiao ();
if (input==2) Tuxing_yanghuisanjiao ();
}

void Tuxing_chengfabiao ()
{int a,b,s;
for (a=1;a<=9;a++)
{for (b=1;b<=a;b++)
{s=a*b;
printf ("%2d*%2d=%2d", a,b,s);
if (b/a==1)
printf ("n");
}

}
Getch ();
}

#define N 11
void Tuxing_yanghuisanjiao ()
{
int k,i,j,a[n][n]={0};
A[1][1]=1;
for (i=2;i<n;i++)
{for (j=1;j<=i;j++)
A[I][J]=A[I-1][J-1]+A[I-1][J];
}

for (i=1;i<=10;i++)
{for (k=0;k<=40-2*i;k++)
printf ("");
for (j=1;j<=i;j++)
{printf ("%4d", A[i][j]);
if (j/i==1)
printf ("/n/n");
}
}
Getch ();
}

void Panduan ()
{
void Panduan_runnian ();
void Panduan_sushu ();
int input;
printf ("Input 1 use to Judge Leap year function/n");
printf ("Input 2 uses the judged prime function/n");
scanf ("%d", &input);
if (input==1) Panduan_runnian ();
if (input==2) Panduan_sushu ();
}

void Panduan_runnian ()
{int nian,leap;
printf ("Enter year:");
scanf ("%d", &nian);
if (nian%4==0)
{
if (nian%100==0)
{if (nian%400==0)
Leap=1;
Else
Leap=0;
}
Else
Leap=0;
}
Else
Leap=0;
if (leap==1)
printf ("%d years is a leap year", Nian);
if (leap==0)
printf ("%d years is not a leap year", Nian);
Getch ();
}

void Panduan_sushu ()
{int Ture=0,i,shu,yinshu;
printf ("input number");
scanf ("%d", &shu);
for (i=2;i<shu;i++)
{if (shu%i==0)
ture=1;
}
if (ture==1)
cout<<shu<< "Not Prime" <<endl;
cout<<shu<< "The factor is:";
for (i=2;i<shu;i++)
{
if (shu%i==0)
{
yinshu=shu/i;
cout<<yinshu<< "";
}
}
if (ture==0)
printf ("%d is Prime", Shu);
Getch ();
}

void Me ()
{printf ("Name: Sail/n");
cout<< "School: 09 class Software outsourcing class of Qufu Normal University" <<endl;
printf ("e-mail:zf3368485@163.com"); 
Getch ();
}
void Time ()
{
#include <time.h>  
time_t   cur_time;  
Time ( &cur_time);  
char   *timestr=ctime (&cur_time);  
  cout< <timestr<<endl;
Getch ();
}