Pattern Program in interview || How to do pattern programming very fast

Pattern Programming in java

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 It is one of the pattern Printing program so, many interviewer are asking these problem in java interview      

   Can you print this Pattern ===========================

1              

2  6               This the gap of number -4

3  7  10                                                   -4,3  

4  8  11  13                                              -4,3,2

5  9  12  14  15                                         -4,3,2,1

------------------------------------------------  

You have to print Like that pattern 

  x=1,2,3,4,5 y=x=1,2,3,4,5

Coding program of this Above program

=============================

  class Pattern{

   public static void main(String args[]){

   //int a=0;

   for(int i=1;i<=5;i++){

          for(int j=i,a=4,p=i;j>=1;j--,p=p+a,a--){

            System.out.print(p+" ");

             

  }

  System.out.println();

   }

    

   }

}

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* Java Interviewer can so  many types of question in java.

Programs to print triangles using *, numbers and characters

Program to print half pyramid using *

*
* *
* * *
* * * *
* * * * *

Source Code

#include<stdio.h>
int main() {
    int i, j, rows;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=1; i<=rows; ++i) {
        for (j=1; j<=i; ++j)
        { printf("* "); }
        printf("\n");
    }
    return 0;
}

---

Program to print half pyramid a using numbers

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

Source Code

#include<stdio.h>
int main() {
    int i,j,rows;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=1; i<=rows; ++i) {
        for (j=1; j<=i; ++j)
        { printf("%d ",j); }
        printf("\n");
    }
    return 0;
}

---

Program to print half pyramid using alphabets

A
B B
C C C
D D D D
E E E E E

Source Code

#include<stdio.h>
int main() {
    int i, j;
    char input, alphabet='A';
    printf("Enter the uppercase character you want to print in last row: ");
    scanf("%c", &input);
    for (i=1; i<=(input-'A'+1); ++i) {
        for (j=1; j<=i; ++j)
        { printf("%c", alphabet); }
        ++alphabet;
        printf("\n");
    }
    return 0;
}

---

Programs to print inverted half pyramid using * and numbers

Inverted half pyramid using *

* * * * *
* * * *
* * * 
* *
*

Source Code

#include<stdio.h>
int main() {
    int i, j, rows;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=rows; i>=1; --i) {
        for (j=1; j<=i; ++j)
        { printf("* "); }
        printf("\n");
    }   
    return 0;
}

---

Inverted half pyramid using numbers

1 2 3 4 5
1 2 3 4 
1 2 3
1 2
1

Source Code

#include<stdio.h>
int main() {
    int i ,j, rows;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=rows; i>=1; --i) {
        for (j=1; j<=i; ++j)
        { printf("%d ",j); }
        printf("\n");
    }
    return 0;
}

---

Programs to display pyramid and inverted pyramid using * and digits

Program to print full pyramid using *

        *
      * * *
    * * * * *
  * * * * * * *
* * * * * * * * *

Source Code

#include<stdio.h>
int main() {
    int i, space, rows, k=0;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=1; i<=rows; ++i,k=0) {
        for (space=1; space<=rows-i; ++space)
        { printf("  "); }
        while (k!=2*i-1) {
            printf("* ");
            ++k;
        }
        printf("\n");
    }    
    return 0;
}

Program to print pyramid using numbers

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

Source Code

#include<stdio.h>
int main() {
    int i, space, rows, k=0, count=0, count1=0;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=1; i<=rows; ++i) {
        for (space=1; space<=rows-i; ++space) {
          printf("  ");
          ++count;
        }
        while (k!=2*i-1) {
            if (count <= rows-1)
            { printf("%d ", i+k);
              ++count;
            }
            else {
              ++count1;
              printf("%d ", (i+k-2*count1));
            }
            ++k;
        }
        count1=count=k=0;
        printf("\n");
    }
    return 0;
}

---

Inverted full pyramid using *

* * * * * * * * *
  * * * * * * *
    * * * * *
      * * *
        *

Source Code

#include<stdio.h>
int main() {
    int rows, i, j, space;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=rows; i>=1; --i) {
        for (space=0; space<rows-i; ++space)
            printf("  ");
        for (j=i; j<=2*i-1; ++j)
            printf("* ");
        for (j=0; j<i-1; ++j)
            printf("* ");
        printf("\n");
    }
    return 0;
}

---

Print Pascal's triangle

           1
         1   1
       1   2   1
     1   3   3    1
   1  4    6   4   1
 1  5   10   10  5   1

Source Code

#include<stdio.h>
int main() {
    int rows, coef=1, space, i, j;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=0; i<rows; i++) {
        for (space=1; space <= rows-i; space++)
            printf("  ");
        for (j=0; j<=i; j++) {
            if (j==0 || i==0)
                coef = 1;
            else
                coef=coef*(i-j+1)/j;
            printf("%4d", coef);
        }
        printf("\n");
    }
    return 0;
}

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Print Floyd's Triangle.

1
2 3
4 5 6