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OUTPUT (after running):
Enter the number of rows
6
*
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*****
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Q13.
Write a C program to draw a Pascal Triangle as follows:
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
[Hint:
 Let us develop its algorithm first:
1. Set a=1, q=0.
2. Read the number of rows, 
row.
3. Repeat through step 15 until q is less than 
row.
4. Initialize p=30–3*q.
5. Repeat through step 7 until p is greater than 
row.

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6. Print “ ”.
7. p=p–1
8. Initialize b=0.
9. Repeat through step 13 until b is less than or equal to q.
10. If b equals to 0 or q equals to 0 then set a=1, else set a=(a*(q–b+1)/b).
11. Print (“ ”);
12. Print a.
13. b=b+1
14. Move to the next line.
15. q=q+1
16. Stop and exit.
The program is as follows:
         void main( )
          {
            int a=1,p,q=0,row, b;
            printf(“Enter the number of rows:”);
            scanf(“%d”, &row);
            printf(“\n Pascal Triangle\n”);
            while (q                  {
                   for (p=30-3*q; p>0;p--)
                        printf(“ “);
                   for (b=0;b<=q;b++)
                        {
                         if (b==0 || q==0)
                              a=1;
                         else
                              a=(a*(q-b+1)/b;
                        printf (“  
“ ,a);
                        }
            printf(“\n”);
            q++;
            }
            }
         }