Question

public void printNumbers(int low, int high) {
   // using a for loop, print all numbers from low to high
}

public int sumOfNumbers(int n) {
   // using a for loop, calculate and return the sum of first n numbers
   // i.e n = 5, answer = 5+4+3+2+1 = 15
}

public void printMultiplicationTable(int num) {
   // using a for loop, print the multiplication table of num (up to first 10!)
   // i.e. num = 5, 5*1=5, 5*2=10, 5*3=15, 5*4=20, 5*5=25, 5*6=30, 5*7=35...
}

Answer 1

public void printNumbers(int low, int high) {
    for (int i = low; i <= high; i++) {
        System.out.println(i);
    }
}

public int sumOfNumbers(int n) {
    int sum = 0;
    for (int i = 1; i <= n; i++) {
        sum += i;
    }
    return sum;
}

public void printMultiplicationTable(int num) {
    // using a for loop, print the multiplication table of num (up to first 10!)
    // i.e. num = 5, 5*1=5, 5*2=10, 5*3=15, 5*4=20, 5*5=25, 5*6=30, 5*7=35...
    for (int i = 1; i <= 10; i++) {
        System.out.println(num + "*" + i + "=" + (num * i));
    }
}

public class LoopNumbers {

    public void printNumbers(int low, int high) {
        for (int i = low; i <= high; i++) {
            System.out.println(i);
        }
    }

    public int sumOfNumbers(int n) {
        int sum = 0;
        for (int i = 1; i <= n; i++) {
            sum += i;
        }
        return sum;
    }

    public void printMultiplicationTable(int num) {
        // using a for loop, print the multiplication table of num (up to first 10!)
        // i.e. num = 5, 5*1=5, 5*2=10, 5*3=15, 5*4=20, 5*5=25, 5*6=30, 5*7=35...
        for (int i = 1; i <= 10; i++) {
            System.out.println(num + "*" + i + "=" + (num * i));
        }
    }

    public static void main(String[] args) {
        new LoopNumbers().printNumbers(5, 9);
        System.out.println(new LoopNumbers().sumOfNumbers(100));
        new LoopNumbers().printMultiplicationTable(5);
    }
}