Print Parallelogram Star Pattern

June 23, 2019

PRINTING PATTERN:

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PREREQUISITE:

Basic knowledge of C language and use of loops.

ALGORITHM:

  1. Take the number of rows and columns as input from the user ( length and breadth of the parallelogram) and store it in two different variables. (‘r’ and ‘c’ in this case)
  2. Run a loop ‘r’ number of times to iterate through all the rows. From i=0 to i<r. The loop should be structured as for(i=0 ; i<r ; i++)
  3.  Run a nested loop ‘i’ times to print the spaces before the parallelogram. From j=0 to j<i. The loop should be structured as for(j=0 ; j<i ; j++).
  4. Inside this nested loop print whitesapce to print the trailing spaces before the parallelogram.
  5. Run another nested loop ‘c’ times to iterate through each column of a row.
  6. Inside this loop print star to print a start in each column of a row.
  7. Inside the main loop move to the next line by printing a new line.

CODE IN C:

#include<stdio.h>
int main()
{
int i,j,r,c;        //declaring integers i,j for loops and r,c for number of rows and columns
printf("Enter the number of rows\n");       //asking user for number of rows
scanf("%d",&r);        //saving number of rows in a variable r
printf("Enter the number of columns\n");       //asking user for number of columns
scanf("%d",&c);         //saving number of columns in a variable c
for(i=0;i<r;i++)        //main loop for controlling number of rows
   {
      for(j=0;j<i;j++)          //nested loop for trailing spaces
         {
            printf(" ");         //printing white space
         }
      for(j=0;j<c;j++)          //nested loop for printing stars row wise
         {
            printf("*");         //printing star
         }
      printf("\n");          //new line to move to the next line after a row
   }
}

TAKING INPUT:

DISPLAYING OUTPUT: