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Single For Loop Programs

/ Programming Questions

Question 1

WAP to take a number (n) as input and then find the sum of all natural numbers between 1 to n.

java 

        
            
import java.util.*;
public class Loops
{
    public static void main()
    {
    int n, i, s = 0;
    Scanner sc = new Scanner(System.in);
    System.out.println("Please enter a number");
    n = sc.nextInt();
    
    // take loop from 1 to n
    for (i = 1; i <= n; i++)
    {
        s += i;
    }
    System.out.println("Sum of the numbers = " + s);
    }
}

python 

        
            
n = int(input("Enter a number: "))
s = 0
for i in range(1,n + 1,1):
    s += i
print('sum = ', s)

Question 2

WAP to take a number (n) as input and then print all natural numbers in reverse from n to 1.

java 

        
            
import java.util.*;
public class Loops
{
    public static void main()
    {
    int n, i;
    Scanner sc = new Scanner(System.in);
    System.out.println("Please enter a number");
    n = sc.nextInt();
    
    // take loop from n to 1
    for (i = n; i >= 1; i--)
    {
        System.out.println(i);
    }
    }
}

python 

        
            
n = int(input("Enter a number: "))
for i in range(n, 0, -1):
    print(i)

Question 3

A Perfect number is a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3 Other perfect numbers are 28, 496, and 8128 WAP a program to input a number and check whether it is a perfect number or not

java 

        
            
import java.util.*;
public class Test
{
    public static void main()
    {
    int n, s = 0, i;
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter a number");
    n = sc.nextInt();
    
    // find proper divisors
    for (i = 1; i < n; i++)
    {
        if (n % i == 0)
            s += i;
    }
    
    if (s == n)
        System.out.println("Perfect Number");
    else
        System.out.println("Not a Perfect Number");
    }
}

python 

        
            
n = int(input("Enter a number: "))
s = 0
for i in range(1, n, 1):
    if n % i == 0:
        s += i
if n == s:
    print('perfect number')
else:
    print('not a perfect number')

Question 4

WAP to input Principal, Rate and Time. Calculate and display the amount which is compounded annualy for each year by using the formula
Interest = (Principal * Rate * Time)/100
For Example, if Principal = 2000, Rate = 10, Time in Years = 5 then
Amount after 1.0 year(s) = 2200.0
Amount after 2.0 year(s) = 2420.0
Amount after 3.0 year(s) = 2662.0
Amount after 4.0 year(s) = 2928.2
Amount after 5.0 year(s) = 3221.02
Finally, Total Interest = 1221.02

java 

        
            
import java.util.*;
public class MyClass {
public static void main(String args[]) {
  double principal, rate, time, interest, i, x;
  Scanner sc = new Scanner(System.in);
  
  // take inputs
  System.out.println("Enter Principal: ");
  principal = sc.nextDouble();
  
  System.out.println("Enter Rate: ");
  rate = sc.nextDouble();
  
  System.out.println("Enter Time in Years: ");
  time = sc.nextDouble();
  
  // store the principal
  x = principal;
  
  // calculate amount for each year
  for (i = 1; i <= time; i++)
  {
      interest = (principal * rate)/100;
      principal = principal + interest;
      System.out.println("Amount after " + i + " year(s) = " + principal);
  }
  
  System.out.println("Total Interest : " + (principal - x));
}
}

python 

        
            
p = int(input("Enter Principal: "))
r = int(input("Enter Rate: "))
t = int(input("Enter Time: "))

# store the principal
x = p

for i in range(1, t + 1, 1):
    p = p + ((p * r)/100)
    print("Amount after ", i, " year(s):", p)

# Total interest
print("Total Interest:", (p - x))

Question 5

WAP to input a number n from the user. Then take n numbers as input from the user using a for loop and find the sum of all the numbers

java 

        
            
import java.util.*;
public class Loops
{
    public static void main()
    {
    int n, a, i, s = 0;
    Scanner sc = new Scanner(System.in);
    
    System.out.println("enter the number of numbers");
    n = sc.nextInt();
    
    for (i = 1; i <= n; i++)
    {
        System.out.println("enter number");
        a = sc.nextInt();
        
        // keep on adding to sum
        s += a;
    }
    System.out.println("sum of all the numbers = " + s);
    }
}

python 

        
            
n = int(input("Enter the number of inputs: "))
s = 0
for i in range(n):
    x = int(input("Enter number: "))
    s += x
print('sum =', s)

Question 6

WAP to find the factorial value of any number taken in as input. The Factorial of n is written as n! = 1 *2 * 3 * … * n - For example: 5! = 1 * 2 * 3 * 4 * 5

java 

        
            
import java.util.*;
public class Loops
{
    public static void main()
    {
    int n, i, f = 1;
    Scanner sc = new Scanner(System.in);
    System.out.println("Please enter a number");
    n = sc.nextInt();
    
    // take loop from 1 to n
    for (i = 1; i <= n; i++)
    {
        f *= i;
    }
    System.out.println("Factorial = " + f);
    }
}

python 

        
            
n = int(input("Enter a number: "))
f = 1
for i in range(1, n + 1, 1):
    f *= i
print('factorial =', f)

Question 7

WAP to find the number and sum of all integer between 100 and 200 which are divisible by 9

java 

        
            
import java.util.*;
public class Test
{
    public static void main()
    {
    int s = 0, i;
    
    // loop from 100 to 200
    for (i = 100; i <= 200; i++)
    {
        if (i % 9 == 0)
            s += i;
    }
    
    System.out.println("Sum = " + s);
    }
}

python 

        
            
s = 0
for i in range(100, 201, 1):
    if i % 9 == 0:
        s += i
print('sum =', s)

Question 8

Take two numbers as input from the user then WAP to find the value of one number raised to the power of another. (Do not use Java built-in method)

java 

        
            
import java.util.*;
public class Loops
{
    public static void main()
    {
    int a, b, i, p = 1;
    Scanner sc = new Scanner(System.in);
    
    // first number
    System.out.println("enter the first number");
    a = sc.nextInt();
    
    //second number
    System.out.println("enter the second number");
    b = sc.nextInt();
    
    // calculate a to the power b
    for (i = 1; i <= b; i++)
    {
        p *= a;
    }
    System.out.println(a + " to the power " + b + " = " + p);
    }
}

python 

        
            
a = int(input("enter the first number: "))
b = int(input("enter the second number: "))
x = 1

for i in range(b):
    x *= a
print('power =', x)

Question 9

WAP to input 2 numbers and print out their HCF (Highest Common Factor)

java 

        
            
import java.util.*;
public class Test
{
public static void main()
{
    int i, a, b, small, hcf = 1;
    Scanner sc = new Scanner(System.in);
    
    System.out.println("enter the first number");
    a = sc.nextInt();
    
    System.out.println("enter the second number");
    b = sc.nextInt();
    
    // find the smaller number
    if (a < b)
        small = a;
    else
        small = b;
    
    // find all the common factors
    for (i = 1; i<= small; i++)
    {
        if ((a % i == 0) && (b % i == 0))
        {
            hcf = i;
            System.out.println(i + " is a common factor");
        }
    }
    System.out.println("HCF of the numbers = " + hcf);
}
}

python 

        
            
a = int(input("Enter the first number: "))
b = int(input("Enter the second number: "))

if a < b:
    small = a
else:
    small = b

hcf = 1
for i in range(1,small + 1, 1):
    if a % i == 0 and b % i == 0:
        print(i, 'is a factor')
        hcf = i

print('HCF = ', hcf)

Question 10

WAP to print the factors of a number. Also print whether the number is prime or not.

java 

        
            
import java.util.*;
public class Loops
{
    public static void main()
    {
    int a, i, count = 0;
    Scanner sc = new Scanner(System.in);
    
    System.out.println("enter a number");
    a = sc.nextInt();
    
    // if a is divisible by i then i is a factor of a
    for (i = 1; i <= a; i++)
    {
        if (a % i == 0)
        {
            System.out.println(i + " is a factor");
            count++; // count the number of factors
        }
    }
    
    // if only 2 factors then number is prime
    if (count == 2)
    {
        System.out.println("Prime Number");
    }
    }
}

python 

        
            
n = int(input("enter a number: "))
c = 0
for i in range(1, n + 1, 1):
    if n % i == 0:
        print(i, 'is a factor')
        c += 1
if c == 2:
    print('prime number')
else:
    print('not a prime number')

Question 11

WAP to input a number n and also input another number x. Then print out the first x multiples of n. For example: if n = 5 and x = 8, then the program should print out the first 8 multiples of 5 which are 5,10,15,20,…,40

java 

        
            
import java.util.*;
public class Test
{
public static void main()
{
    int i, m, n, x;
    Scanner sc = new Scanner(System.in);
    
    System.out.println("enter a number");
    n = sc.nextInt();
    
    System.out.println("enter the number of multiples");
    x = sc.nextInt();
    
    for (i = 1; i<= x; i++)
    {
        m = i * n;
        System.out.println(m);
    }
}
}

python 

        
            
n = int(input("Enter a number: "))
x = int(input("Enter the number of multiples: "))

for i in range(1, x + 1, 1):
    m = n * i
    print(m)

Question 12

WAP to input a number n from the user. Then take n numbers as input from the user using a for loop and at the end it should display the count of positive, negative and zeros entered.

java 

        
            
import java.util.*;
public class Loops
{
    public static void main()
    {
    int n, a, i, pos = 0, neg = 0, zeros = 0;
    Scanner sc = new Scanner(System.in);
    
    System.out.println("enter the number of numbers");
    n = sc.nextInt();
    
    for (i = 1; i <= n; i++)
    {
        System.out.println("enter number");
        a = sc.nextInt();
        
        // check if positive
        if (a > 0)
        {
            pos++;
        }
        // check if negative
        else if (a < 0)
        {
            neg++;
        }
        // if not +ve or -ve then 0
        else
        {
            zeros++;
        }
    }
    System.out.println("total positive numbers = " + pos);
    System.out.println("total negative numbers = " + neg);
    System.out.println("total zeros = " + zeros);
    }
}

python 

        
            
n = int(input("Enter the number of inputs: "))
pos = 0
neg = 0
zero = 0

for i in range(n):
    x = int(input("Enter number: "))
    if x > 0:
        pos += 1
    elif x < 0:
        neg += 1
    else:
        zero += 1

print('positive numbers =', pos)
print('negative numbers =', neg)
print('zeroes =', zero)

Question 13

WAP to display 10 different numbers from the user and display the greatest and the least number from the set.

java 

        
            
import java.util.*;
public class Test
{
    public static void main()
    {
    Scanner sc = new Scanner(System.in);
    int n, max, min, i;
    
    // enter the first number
    System.out.println("Enter number 1");
    n = sc.nextInt();
    
    max = n;
    min = n;
    
    // enter the remaining numbers
    for (i = 2; i <= 10; i++)
    {
        System.out.println("Enter number " + i);
        n = sc.nextInt();
        
        // check if more than max
        if (n > max)
            max = n;
            
        // check if less than min
        if (n < min)
            min = n;
    }
    
    // print out max and min
    System.out.println("Maximum Number: " + max);
    System.out.println("Minimum Number: " + min);
    }
}

python 

        
            
# enter the first number
n = int(input('enter number 1: '))

# initialize the maximum and minimum numbers
mx = n
mn = n

# enter the rest of the numbers
for i in range(2, 11, 1):
    n = int(input('enter number ' + str(i) + ': '))

    # if more than max
    if n > mx:
        mx = n

    # if less than min
    if n < mn:
        mn = n

print('Maximum number: ', mx)
print('Minimum number: ', mn)

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