Print Half Diamond Star Pattern

June 23, 2019

PRINTING PATTERN:

*

**

***

****

***

**

*

PREREQUISITE:

Basic knowledge of C language and use of loops.

ALGORITHM:

1. Take the number of rows as input from the user and store it in any variable.(‘r‘ in this case).
2. Run a loop ‘r’ number of times to iterate through each of the rows. From i=0 to i<r. The loop should be structured as for( i=0 ; i<r : i++).
3. Use an if condition to to print the top half of the pyramid. if (i<=r/2). Then run a loop from j=0 to j<=i. The loop should be structured as for(j=0 ; j<=i ; j++)
4. Inside this loop print star.
5. Else run a different loop from j=i to j<r. The loop should be structured as for( j=i ; j<r ; j++).
6. Inside this loop print star.
7. Inside the main loop print a newline to move to the next line after each row is printed.

CODE IN C:

#include<stdio.h>
int main()
{
int i,j,r;                     //declaring integer variables i,j for loops and r for number of rows
printf("Enter the number of rows(odd) :\n"); //Asking user for input
scanf("%d",&r);                     //taking number of rows and saving it in variable r
for(i=0;i<r;i++)                   // loop for number of rows
   {
      if(i<=(r/2))                //if condition to print the top half    
         {
            for(j=0;j<=i;j++)     // loop for stars per each row
               {
                  printf("*");    //printing stars
               }
         }
      else                        //else condition to print the bottom half
         {
            for(j=i;j<r;j++)      //loop for printing
               {
                  printf("*");    //printing stars
               }
         }

      printf("\n");      // printing newline after each row
   }
}

TAKING INPUT:

DISPLAYING OUTPUT: