3.1.1 import java.io.*;
import java.util.*;
public class Test{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int num;
num = in.nextInt();
if(num > 0){
System.out.println(“Positive”);
}
if(num < 0){
System.out.println(“Negative”);
}
if(num == 0){
System.out.println(“Zero”);
}
}
}
3.1.2 import java.io.*;
import java.util.*;
public class Test{
public static void main(String args[]){
Scanner in = new Scanner(System.in);
int age;
age = in.nextInt();
if (age >= 18)
System.out.print(“Eligible to vote”);
else
System.out.print(“Not eligible to vote”);
}
}
3. import java.io.*;
import java.util.*;
public class Test{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
switch(str){
case “A”:
System.out.print(“Excellent”);
break;
case “B”:
System.out.print(“Good”);
break;
case “C”:
System.out.print(“Passed”);
break;
case “D”:
System.out.print(“You need to work hard.”);
break;
default:
System.out.print(“Invalid grade”);
}
}
}
4. import java.io.*;
import java.util.*;
public class Test{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int n, sum = 0, i = 1;
n = in.nextInt();
do{
if (i % 2 == 0){
sum = sum + i;
}
else{
sum = sum * i;
}
i++;
}while(i <= n);
System.out.print(sum);
}
}
5. import java.io.*;
import java.util.*;
public class Test{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int x,y;
x = in.nextInt();
y = in.nextInt();
while(x < y){
x++;
System.out.print(x + ” ” );
}
}
}
6. import java.io.*;
import java.util.*;
public class loop{
public static void main(String args[]){
int n = 3, total = 0;
Scanner s = new Scanner(System.in);
int a[] = new int[n];
for(int i = 0; i < n; i++){
a[i] = s.nextInt();
}
for(int b : a){
total = total + b;
}
System.out.print(“The total of the given three numbers is ” + total + “.”);
}
}
7. import java.util.Scanner;
public class Multiple{
public static void main(String args[]){
Scanner scan = new Scanner(System.in);
int num = scan.nextInt();
for (int i = 1; i <= 10; i++){
int n = num * i;
System.out.println(n);
}
}
}
8. public class Pattern{
public static void main(String[] args){
int a = 5;
for(int i = 1; i <= a; i++){
for(int j = 1; j <= i; j++){
System.out.print(j);
}
System.out.println();}
}
}
9. public class Control{
public static void main(String args[]){
for (int i = 1; i <= 10; i++){
if (i == 4 || i == 8){
continue;
}
System.out.println(i);
}
}
}
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