Pascals Triangle & Pattern

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 //prg to display diamond and pascals triangle  
 //Downloaded From www.c4cpp.co.nr. (C)2009.All rights reserved.  
 #include<iostream.h>  
 #include<conio.h>  
 void main()  
 {  
 clrscr();  
 int x,i,f,r,b,g,c,h,v=1,q,j,n,p,k=1;  
 int ch;  
 cout<<"Enter choice        1:STARS"<<endl;  
 cout<<"              2:NUMBERS"<<endl;  
 cin>>ch;  
 switch(ch)  
 {  
 //WITH STAR  
 case 1:  
 v=2;  
 char a2[100][100];  
 cout<<"Enter Limit : "<<endl;  
 cin>>n;  
 p=n-1;  
 //INPUTTING  
 for(i=0;i<=(2*n)-2;i++)  
    {  
    for(j=0;j<=(2*n)-2;j++)  
    {  
        a2[i][j]= ' ';  
        }  
        }  
 //STARTING  
 for(i=0;i<=(2*n)-2;i++)  
    {  
    for(j=0;j<=(2*n)-2;j++)  
    {  
        if(((i+j)==p)&&(i<n))  
        {  
        for(c=0;c<k;c++)  
        {  
        a2[i][j]='*';  
        j=j+v;  
        }  
        k++;  
        j=(2*n)-2;  
        r=c-1;  
        }  
        if(((i+j)==(p+2))&&(i>=n))  
        {  
        for(h=r;h>0;h--)  
        {  
        a2[i][j]='*';  
        j=j+v;  
        }  
        p=p+2;  
        r--;  
        j=(2*n)-2;  
        }  
        }  
        }  
 for(i=0;i<=(2*n)-2;i++)  
 {  
 cout<<endl;  
 for(j=0;j<=(2*n)-2;j++)  
 {  
 cout<<a2[i][j];  
 }  
 }  
 break;  
 //CASE TWO WITH NUMBERS  
 case 2:  
 int a[100][100];  
 cout<<"Enter Limit  : "<<endl;  
 cin>>n;  
 p=n-1;  
 for(i=0;i<=(2*n)-2;i++)  
 {  
 for(j=0;j<=(2*n)-2;j++)  
 {  
 a[i][j]=0;  
 }  
 }  
 for(i=0;i<=(2*n)-2;i++)  
 {  
 for(j=0;j<=(2*n)-2;j++)  
 {  
 if(((i+j)==p)&&(i<n))  
 {  
 b=1;  
 for(c=0;c<k;c++)  
 {  
 if(j<=(n-1))  
 {  
 a[i][j]=b;  
 j=j+v;  
 b++;  
 r=b-2;  
 }  
 if(j>(n-1))  
 {  
 a[i][j]=r;  
 j=j+v;  
 r--;  
 }  
 }  
 k=k+2;  
 j=(2*n)-2;  
 r=c-2;  
 }  
 if(((i+j)==p+2)&&(i>=n))  
 {  
 f=1;  
 for(h=r;h>0;h--)  
 {  
 if(j<=(n-1))  
 {  
 a[i][j]=f;  
 j=j+v;  
 f++;  
 x=f-2;  
 }  
 if(j>(n-1))  
 {  
 a[i][j]=x;  
 j=j+v;  
 x--;  
 }  
 }  
 r=r-2;  
 p=p+2;  
 j=(2*n)-2;  
 }  
 }  
 }  
 for(i=0;i<=(2*n)-2;i++)  
 {  
 cout<<endl;  
 for(j=0;j<=(2*n)-2;j++)  
 {  
 if(a[i][j]!=0)  
 cout<<a[i][j];  
 else  
 cout<<" ";  
 }  
 }  
 break;  
 default:  
 cout<<"Wrong choice"<<endl;  
 break;  
 }  
 getch();  
 }