2.1
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
double f, c;
c = input.nextDouble();
f = (9.0/5)*c+32;
System.out.println(f);
}
}
2.2
public class test {
public static void main(String[] args) {
double r, h;
final double PI = 3.1415925;
System.out.println("Enter the radius and length of a cylinder: ");
Scanner input = new Scanner(System.in);
r = input.nextDouble();
h = input.nextDouble();
System.out.println("The area is " + PI*r*r);
System.out.println("The volume is " + PI*r*r*h);
}
}
2.3
public class test {
public static void main(String[] args) {
double f, m;
Scanner input = new Scanner(System.in);
System.out.println("Enter a value for feet: ");
f = input.nextDouble();
System.out.println(f + " feet is " + 0.305 *f + " meters");
}
}
2.4
public class test {
public static void main(String[] args) {
double p, k;
Scanner input = new Scanner(System.in);
System.out.println("Enter a number in pounds: ");
p = input.nextDouble();
System.out.println(p + " pounds is " + 0.454 * p + " kilograms");
}
}
2.6
public class test {
public static void main(String[] args) {
int n, sum, t;
Scanner input = new Scanner(System.in);
System.out.println("Enter a number between 0 and 1000: ");
n = input.nextInt();
sum = 0;
t = n % 10;
while(t != 0) {
sum += t;
n /= 10;
t = n % 10;
}
System.out.println("The sum of the digits is " + sum);
}
}
2.7
public class test {
public static void main(String[] args) {
int m = 0;
int years, days, t;
System.out.println("Enter the number of minutes: ");
Scanner input = new Scanner(System.in);
m = input.nextInt();
t = (m / 60) / 24;
years = t / 365;
days = t % 365;
System.out.println(m + " minutes is approximately " + years + " years and " + days + "days.");
}
}
2.8
public class test {
public static void main(String[] args) {
int n;
char c;
Scanner input = new Scanner(System.in);
System.out.print("Enter an ASCII code: ");
n = input.nextInt();
c = (char)n;
System.out.println("The character for ASCII code " + n + " is " + c);
}
}
2.11
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter employee's name: ");
String name = input.next();
System.out.println("Enter number of hours worked in a week: ");
float hours = input.nextFloat();
System.out.println("Enter hourly pay rate: ");
float payRate = input.nextFloat();
System.out.println("Enter federal tax withholding rate: ");
float ftwr = input.nextFloat();
System.out.println("Enter state tax withholding rate: ");
float stwr = input.nextFloat();
System.out.println("Employee Name " + name);
System.out.println("Hours Worked " + hours);
System.out.println("Pay Rate: $" + payRate);
System.out.println("Gross Pay: $" + hours * payRate);
System.out.println("Deductions:");
System.out.println(" Federal Withholding (" + ftwr * 100 +"%): $" + payRate * ftwr);
System.out.println(" State Withholding (" + stwr * 100 +"%): $" + payRate * stwr);
System.out.println(" Total Deduction: $" + payRate * (ftwr + stwr);
}
}
2.12
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter balance and interest rate (e.g., 3 for 3%): ");
double balance = input.nextDouble();
double rate = input.nextDouble();
System.out.printf("The interest is %.4f", balance * (rate / 1200));
}
}
2.13
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
//System.out.println("Enter balance and interest rate (e.g., 3 for 3%): ");
System.out.print("Enter investment amount: ");
double investmount = input.nextDouble();
System.out.print("Enter monthly interest rate: ");
double rate = input.nextDouble();
System.out.print("Enter number of years: ");
int year = input.nextInt();
double s = investmount * Math.pow((1 + rate / 100), (year * 12));
System.out.println("Accumulated value is " + s);
}
}
2.14
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter weigth in pounds: ");
float weigth = input.nextFloat();
System.out.print("Enter heigth in inches: ");
float height = input.nextFloat();
System.out.println("BMI is " + 0.45359237 * weigth / Math.pow(height * 0.0254, 2));
}
}
2.15
public class test {
public static void main(String[] args) {
double t, s;
s = t = 0;
Scanner input = new Scanner(System.in);
for(int i = 0; i < 6; i++) {
s = (100 + t) * (1 + 0.00417);
t = s;
}
System.out.println("After six months, result is: " + s);
}
}
2.16
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the amount of water in kilogram: " );
double m = input.nextDouble();
System.out.print("Enter the initial temperature: " );
double it = input.nextDouble();
System.out.print("Enter the final temperature: " );
double ft = input.nextDouble();
System.out.println("The energy needed is " + m * (ft - it) * 4184);
}
}
2.17
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the temperature in Fahrenheit: " );
double f = input.nextDouble();
System.out.print("Enter the wind miles per hour: ");
double speed = input.nextDouble();
System.out.println("The wind chill index is " + (35.74 + 0.6215 * f - 35.75 * Math.pow(speed, 0.16) + 0.427 * f * Math.pow(speed, 0.16)));
}
}
2.18
public class test {
public static void print() {
System.out.print(" ");
}
public static void main(String[] args) {
System.out.println("a b pow(a, b)");
for(int i = 1; i < 6; i++) {
System.out.print(i);
print();
System.out.print(i + 1);
print();
System.out.println((int)Math.pow(i, i +1));
}
}
}