Pattern Programs In Java
This is the solution for the practice question set on the concept of star and number patterns in programming languages using for and while loops (iteration statements) and numeric concepts.
You can access the question sheet here. Try solving these questions on your own before accessing this solution set.
Question 1
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
for(i=1;i<=5;i++)
{
for(j=1;j<=5;j++)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Question 2
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
for(i=1;i<=5;i++)
{
for(j=1;j<=5;j++)
{
if(i==1||i==5||j==1||j==5)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
}
Question 3
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
for(i=1;i<=5;i++)
{
for(j=1;j<=i;j++)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Question 4
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
for(i=5;i>=1;i--)
{
for(j=1;j<=i;j++)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Question 5
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
for(i=5;i>=1;i--)
{
for(j=1;j<=5;j++)
{
if(j>=i)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
}
Question 6
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
for(i=1;i<=5;i++)
{
for(j=1;j<=i;j++)
{
System.out.print(j+" ");
}
System.out.println();
}
}
}
Question 7
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
for(i=5;i>=1;i--)
{
for(j=1;j<=i;j++)
{
System.out.print(j+" ");
}
System.out.println();
}
}
}
Question 8
CODE :
class Main {
public static void main(String[] args)
{
int i,j,k=65;
for(i=5;i>=1;i--)
{
for(j=1;j<=i;j++)
{
System.out.print((char)k+" ");
k++;
}
System.out.println();
}
}
}
Question 9
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
String s = "ABCDE";
for(i=0;i<s.length();i++)
{
for(j=0;j<=i;j++)
{
System.out.print(s.charAt(j)+" ");
}
System.out.println();
}
}
}
Question 10
CODE :
class Main {
public static void main(String[] args)
{
int i,j;
String s = "AMARA";
for(i=s.length()-1;i>=0;i--)
{
for(j=0;j<=i;j++)
{
System.out.print(s.charAt(j)+" ");
}
System.out.println();
}
}
}
Question 11
CODE :
class Main {
public static void main(String[] args)
{
int n=5,i,j;
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
{
if(j==1 || i==1 || i==5)
System.out.print("* ");
else
System.out.print(" ");
}
for(j=1;j<=n-i;j++)
{
if(j==n-i || i==1 || i==5)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
}
Question 12
CODE :
class Main
{
public static void main(String[] args)
{
int i,j,n = 5;
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
for(j=i;j>=1;j--)
{
System.out.print(j+" ");
}
for(j=2;j<=i;j++)
{
System.out.print(j+" ");
}
System.out.println();
}
}
}
Question 13
CODE :
class Main {
public static void main(String[] args)
{
int sp,i,j;
//first part
for(i=1;i<=4;i++)
{
sp=8-(i*2);
for(j=1;j<=i;j++)
System.out.print("* ");
for(j=1;j<=sp;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print("* ");
System.out.println();
}
//second part
for(i=4;i>=1;i--)
{
sp=8-(i*2);
for(j=1;j<=i;j++)
System.out.print("* ");
for(j=1;j<=sp;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print("* ");
System.out.println();
}
}
}
Question 14
CODE :
class Main {
public static void main(String[] args)
{
int sp,i,j;
//first part
for(i=1;i<=4;i++)
{
sp=8-(i*2);
for(j=1;j<=i;j++)
{
if(j==1 || j==i)
System.out.print("* ");
else
System.out.print(" ");
}
for(j=1;j<=sp;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
{
if(j==1 || j==i)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
//second part
for(i=4;i>=1;i--)
{
sp=8-(i*2);
for(j=1;j<=i;j++)
{
if(j==1 || j==i)
System.out.print("* ");
else
System.out.print(" ");
}
for(j=1;j<=sp;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
{
if(j==1 || j==i)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
}
Question 15
CODE :
class Main
{
public static void main(String[] args)
{
int i,j,n = 5;
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
for(j=1;j<=i;j++)
{
System.out.print(i+" ");
}
System.out.println();
}
}
}
Question 16
CODE :
class Main
{
public static void main(String[] args)
{
int i,j,n = 5;
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
for(j=1;j<=i;j++)
{
System.out.print("* ");
}
System.out.println();
}
}
}
Question 17
CODE :
class Main
{
public static void main(String[] args)
{
int i,j,n = 4;
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
for(j=1;j<=2*i-1;j++)
{
System.out.print("*");
}
System.out.println();
}
for(i=4;i>=1;i--)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
for(j=1;j<=2*i-1;j++)
{
System.out.print("*");
}
System.out.println();
}
}
}
Question 18
CODE :
class Main
{
public static void main(String[] args)
{
int i,j,num,rem,n = 5;
for(i=0;i<5;i++)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
num=(int)Math.pow(11,i);
while(num>0)
{
rem=num%10;
System.out.print(rem+" ");
num=num/10;
}
System.out.println();
}
}
}
Question 19
CODE :
class Main
{
public static void main(String[] args)
{
int i,j,n = 5;
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
for(j=1;j<=i;j++)
{
System.out.print(j+" ");
}
System.out.println();
}
}
}
Question 20
CODE :
class Main
{
public static void main(String[] args)
{
int i,j,n = 4, counter = 1;
for(i=4;i>=1;i--)
{
for(j=1;j<=n-i;j++)
{
System.out.print(" ");
}
for(j=1;j<=i;j++)
{
System.out.print(counter+" ");
}
counter++;
System.out.println();
}
}
}
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