basic conditions and loops
1.
Bus Ticket Counter
Story:
A conductor issues tokens to passengers. Each passenger must get a number in
sequence.
Why: Helps students learn loops.
Logic:
- Input: number of passengers.
- Use for loop to print numbers 1 to n.
- Extension: use if inside loop to print only even tokens.
Program:
import java.util.Scanner;
public class tokens{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
System.out.println("Enter number of passengers:");
int n=sc.nextInt();
for(int i=1;i<=n;i+=2){
System.out.println("Only print even numbers:");
}
}
}
OUTPUT:
2.
Shop Discount Calculator
Story:
A shop applies discounts depending on bill amount.Why: Introduces if-else conditions.
Logic:
- Input: bill amount.
- If bill < 1000 → apply 10%.
- Else → apply 20%.
- Final price = bill - discount.
Program:
import java.util.Scanner;
public class shopbill{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
System.out.println("Enter the bill amount:");
int billamount=sc.nextInt();
float discount=0;
if(billamount<1000){
discount=billamount*10/100;
}
else{
discount=billamount*20/100;
}
float price=billamount-discount;
System.out.println("Final price:" +price);
}
}
OUTPUT:
3.
School Attendance
Story:
Class teacher records attendance as "P"
for present, "A" for absent.
Why: Helps in counting characters in a string.
Logic:
- Input: string like "PAPAPPPAA".
- Loop through string → count P and A.
- Print "Present
= X, Absent = Y".
Program:
import java.util.Scanner;
class records{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
System.out.println("Enter attendece record:");
String record=sc.nextLine();
int present=0,absent=0;
for(int i=0;i<record.length();i++){
if(record.charAt(i)=='P'){
present++;
}
else if(record.charAt(i)=='A'){
absent++;
}
}
System.out.println("Present=" +present);
System.out.println("Absent=" +absent);
}
}
OUTPUT:
4.
Village Water Tank
Story:
A water tank has limited supply. Villagers want to know how long it lasts.
Why: Good for division and loop thinking.
Logic:
- Input: capacity (100 liters), daily usage.
- Days = capacity
/ dailyUsage.
- Remainder = leftover water.
Program:
import java.util.Scanner;
public class watertank{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
System.out.println("Enter the daily usage of water:");
int dailyusage=sc.nextInt();
int days=0;
int capacity=100;
days=capacity/dailyusage;
System.out.println("The water will use for the days:" + days);
int remainder=capacity%dailyusage;
System.out.println("left over after the water:" +remainder);
sc.close();
}
}
OUTPUT:
5.
Multiplication Game
Story:
A student practices multiplication tables.
Why: Introduces simple loops.
Logic:
- Input: number (say 7).
- Loop from 1 to 10 → print 7 x i = result.
Program:
