Java code to Pascal triangle pattern using Array

Java code to Pascal triangle pattern using Array

In this tutorial, we will discuss the concept of the Java code to Pascal triangle pattern using Array

In this topic, we are going to learn how  to write a program to print Pascal triangle patterns using a single dimension Array in the Java programming language

Here, we  use for, while, and do-while loops for printing pascal triangle

Display the pascal triangle in Java using loops

Java Code to display pascal triangle using for loop

In this program, the user declares and initializes integer variables, it will display a pascal triangle number pattern using for loop in the Java language according to the rows

Program 1

//Java programto print pascal triangle using Array
//class diclaration
class Disp_PascalTriangleArray{
public static void main (String args[]){//main method
int row=6,i,j,temp=1,count=0;
int[] array=new int[row];
int[] arrayTemp=new int[row];
array[0]=1;
array[1]=1;

for(i=0; i<row; i++)
{
    for(j=(row-1); j>i; j--)
        System.out.print(" ");
    for(j=0; j<=i; j++)
    {
        if(i==0)
        System.out.print("1");
    else
    { if(j==0|| j==i)
        System.out.print("1 ");
    else{
        arrayTemp[temp]=array[count]+array[count+1];
        System.out.print(arrayTemp[temp]+" ");
        temp++;
        count++;
    }
    }
    }
    System.out.println();
    arrayTemp[temp]=1;
    if(i>1)
    {
        count=0;
        array[count]=1;
        for(temp=1,count=1; count<=i; temp++, count++)
            array[count]=arrayTemp[temp];
        temp=1;
        count=0;
    }
}
}
    
}

When the above code is executed, it produces the following result

 

 

Java Code to display pascal triangle using while loop

In this program, the user declares and initializes variables, it will show a pascal triangle number pattern using a while loop in the Java language according to the rows,

Program 2

//Java programto print pascal triangle using Array
//class diclaration
class Disp_PascalTriangleArray1{
public static void main (String args[]){//main method
int row=5,i,j,temp=1,count=0;
int[] array=new int[row];
int[] arrayTemp=new int[row];
array[0]=1;
array[1]=1;

i=0; 
while(i<row)
{
    j=(row-1);
    while( j>i){
        System.out.print(" ");
     j--;
    }
    j=0;
    while(j<=i)
    {
        if(i==0)
        System.out.print("1");
    else
    { if(j==0|| j==i)
        System.out.print("1 ");
    else{
        arrayTemp[temp]=array[count]+array[count+1];
        System.out.print(arrayTemp[temp]+" ");
        temp++;
        count++;
    }
    }
    j++;
    }
    System.out.println();
    arrayTemp[temp]=1;
    if(i>1)
    {
        count=0;
        array[count]=1;
        for(temp=1,count=1; count<=i; temp++, count++)
            array[count]=arrayTemp[temp];
        temp=1;
        count=0;
    }
    i++;
}
}
    
}

When the above code is executed, it produces the following result

 

Java Code to display pascal triangle using do-while loop

In this program, the user declares and initializes variables and then it will show a pascal triangle number pattern using the do-while loop in the Java language according to the rows,

Program 1

//Java programto print pascal triangle using Array
//class diclaration
class Disp_Pascal_Triangle_Array_Dowhile1{
public static void main (String args[]){//main method

int row_No=7,i,j,temp=1,count=0;
int[] array=new int[row_No];
int[] arrayTemp=new int[row_No];
array[0]=1;
array[1]=1;

i=0; 
do{
    j=(row_No-1);
    do{
        System.out.print(" ");//print initial space
     j--;
    }while( j>=i);
    j=0;
    
    do{
        if(i==0)
        System.out.print("1");
    else
    { if(j==0|| j==i)
        System.out.print("1 ");
    else{
        arrayTemp[temp]=array[count]+array[count+1];
        System.out.print(arrayTemp[temp]+" ");
        temp++;
        count++;
    }
    }
    j++;
    }while(j<=i);
    System.out.println();
    arrayTemp[temp]=1;
    if(i>1)
    {
        count=0;
        array[count]=1;
        for(temp=1,count=1; count<=i; temp++, count++)
            array[count]=arrayTemp[temp];
        temp=1;
        count=0;
    }
    i++;
}while(i<row_No);
}
    
}

When the above code is executed, it produces the following result

 

 

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