Reverse Floyd Triangle - Half Floyd Number Diamond

Q. Write a C Floyd triangle program in reverse order as following pattern:

     1
     2 3
     4 5 6
     7 8 9 10
     4 5 6
     2 3
     1

Ans.

/*c program of Reverse Floyd Triangle - Half Floyd Number Diamond*/

#include<stdio.h>
int main()
{
 int n=4,r,c,y,p=4,x=1;
 for(r=1; r<=n; r++)
 {
   for(c=1; c<=r; c++,x++)
       printf(" %d",x);
   printf("\n");
 }
 for(r=n-1; r>1; r--,p=p-2)
 {
   for(c=1,y=p; c<=r; c++,y++)
       printf(" %d",y);
   printf("\n");
 }
 printf(" 1");
 getch();
 return 0;
}

/***********************************************************

The output of above Reverse Floyd Triangle program would be:

***********************************************************/

Figure: Screen shot of Reverse Floyd Triangle -
Half Floyd Number Diamond C program

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3. Floyd triangle as following pattern:

                       1

                   2 3

                  4 5 6

                 7 8 9 10

4. Reverse Floyd Number Pattern C program

             9
             8  7
             6  5  4
             3  2  1  0

5. Floyd Character Pattern C program:

               A
               B  C
               D  E  F
               G  H  I  J

4. Pascal triangle as following pattern:

                          1

                    1 1

                   1 2 1

                  1 3 3 1

                 1 4 6 4 1