Coding Answers for Questions

Programming Answers – C, Python, Java

Programming Practice Answers

C, Python & Java solutions for basic to placement-level questions.

Basics: Input / Output Loops & Logic Patterns Arrays Strings Placement Prep

Q1. Sum of Two Numbers

C Program

#include <stdio.h>

int main() {
    int a, b;
    printf("Enter two numbers: ");
    scanf("%d %d", &a, &b);
    printf("Sum = %d\n", a + b);
    return 0;
}

Python Program

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

print("Sum =", a + b)

Java Program

import java.util.Scanner;

public class SumOfTwoNumbers {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter two numbers: ");
        int a = sc.nextInt();
        int b = sc.nextInt();

        int sum = a + b;
        System.out.println("Sum = " + sum);
    }
}

Q2. Even or Odd

C Program

#include <stdio.h>

int main() {
    int n;
    printf("Enter a number: ");
    scanf("%d", &n);

    if (n % 2 == 0)
        printf("Even\n");
    else
        printf("Odd\n");

    return 0;
}

Python Program

n = int(input("Enter a number: "))

if n % 2 == 0:
    print("Even")
else:
    print("Odd")

Java Program

import java.util.Scanner;

public class EvenOrOdd {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        if (n % 2 == 0)
            System.out.println("Even");
        else
            System.out.println("Odd");
    }
}

Q3. Greatest of Three Numbers

C Program

#include <stdio.h>

int main() {
    int a, b, c, max;
    printf("Enter three numbers: ");
    scanf("%d %d %d", &a, &b, &c);

    max = a;
    if (b > max) max = b;
    if (c > max) max = c;

    printf("Greatest = %d\n", max);

    return 0;
}

Python Program

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

greatest = a
if b > greatest:
    greatest = b
if c > greatest:
    greatest = c

print("Greatest =", greatest)

Java Program

import java.util.Scanner;

public class GreatestOfThree {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter three numbers: ");
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();

        int max = a;
        if (b > max) max = b;
        if (c > max) max = c;

        System.out.println("Greatest = " + max);
    }
}

Q4. Simple Interest Calculator

C Program

#include <stdio.h>

int main() {
    float p, r, t, si;
    printf("Enter principal, rate and time: ");
    scanf("%f %f %f", &p, &r, &t);

    si = (p * r * t) / 100.0;
    printf("Simple Interest = %.2f\n", si);

    return 0;
}

Python Program

p = float(input("Enter principal: "))
r = float(input("Enter rate: "))
t = float(input("Enter time: "))

si = (p * r * t) / 100
print("Simple Interest =", si)

Java Program

import java.util.Scanner;

public class SimpleInterestCalculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter principal, rate and time: ");
        double p = sc.nextDouble();
        double r = sc.nextDouble();
        double t = sc.nextDouble();

        double si = (p * r * t) / 100;
        System.out.println("Simple Interest = " + si);
    }
}

Q5. Positive, Negative or Zero

C Program

#include <stdio.h>

int main() {
    int n;
    printf("Enter a number: ");
    scanf("%d", &n);

    if (n > 0)
        printf("Positive\n");
    else if (n < 0)
        printf("Negative\n");
    else
        printf("Zero\n");

    return 0;
}

Python Program

n = int(input("Enter a number: "))

if n > 0:
    print("Positive")
elif n < 0:
    print("Negative")
else:
    print("Zero")

Java Program

import java.util.Scanner;

public class NumberSign {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        if (n > 0)
            System.out.println("Positive");
        else if (n < 0)
            System.out.println("Negative");
        else
            System.out.println("Zero");
    }
}

Q6. Multiplication Table

C Program

#include <stdio.h>

int main() {
    int n;
    printf("Enter a number: ");
    scanf("%d", &n);

    for (int i = 1; i <= 10; i++) {
        printf("%d x %d = %d\n", n, i, n * i);
    }

    return 0;
}

Python Program

n = int(input("Enter a number: "))

for i in range(1, 11):
    print(f"{n} x {i} = {n * i}")

Java Program

import java.util.Scanner;

public class MultiplicationTable {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        for (int i = 1; i <= 10; i++) {
            System.out.println(n + " x " + i + " = " + (n * i));
        }
    }
}

Q7. Factorial of a Number

C Program

#include <stdio.h>

int main() {
    int n;
    long long fact = 1;
    printf("Enter a number: ");
    scanf("%d", &n);

    if (n < 0) {
        printf("Factorial is not defined for negative numbers.\n");
        return 0;
    }

    for (int i = 1; i <= n; i++) {
        fact *= i;
    }

    printf("Factorial = %lld\n", fact);

    return 0;
}

Python Program

n = int(input("Enter a number: "))

if n < 0:
    print("Factorial is not defined for negative numbers.")
else:
    fact = 1
    for i in range(1, n + 1):
        fact *= i
    print("Factorial =", fact)

Java Program

import java.util.Scanner;

public class Factorial {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        if (n < 0) {
            System.out.println("Factorial is not defined for negative numbers.");
        } else {
            long fact = 1;
            for (int i = 1; i <= n; i++) {
                fact *= i;
            }
            System.out.println("Factorial = " + fact);
        }
    }
}

Q8. Sum of First N Natural Numbers

C Program

#include <stdio.h>

int main() {
    int n;
    int sum = 0;
    printf("Enter N: ");
    scanf("%d", &n);

    for (int i = 1; i <= n; i++) {
        sum += i;
    }

    printf("Sum = %d\n", sum);

    return 0;
}

Python Program

n = int(input("Enter N: "))

sum_n = 0
for i in range(1, n + 1):
    sum_n += i

print("Sum =", sum_n)

Java Program

import java.util.Scanner;

public class SumOfNaturalNumbers {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter N: ");
        int n = sc.nextInt();

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

        System.out.println("Sum = " + sum);
    }
}

Q9. Count Digits in a Number

C Program

#include <stdio.h>

int main() {
    int n;
    int count = 0;
    printf("Enter a number: ");
    scanf("%d", &n);

    if (n == 0) {
        count = 1;
    } else {
        if (n < 0) n = -n;
        while (n > 0) {
            count++;
            n /= 10;
        }
    }

    printf("Number of digits = %d\n", count);

    return 0;
}

Python Program

n = int(input("Enter a number: "))

if n == 0:
    count = 1
else:
    n = abs(n)
    count = 0
    while n > 0:
        count += 1
        n //= 10

print("Number of digits =", count)

Java Program

import java.util.Scanner;

public class CountDigits {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        if (n == 0) {
            System.out.println("Number of digits = 1");
        } else {
            n = Math.abs(n);
            int count = 0;
            while (n > 0) {
                count++;
                n /= 10;
            }
            System.out.println("Number of digits = " + count);
        }
    }
}

Q10. Reverse a Number

C Program

#include <stdio.h>

int main() {
    int n;
    int rev = 0;
    printf("Enter a number: ");
    scanf("%d", &n);

    int temp = n;
    while (temp != 0) {
        int digit = temp % 10;
        rev = rev * 10 + digit;
        temp /= 10;
    }

    printf("Reversed number = %d\n", rev);

    return 0;
}

Python Program

n = int(input("Enter a number: "))

rev = 0
temp = n

while temp != 0:
    digit = temp % 10
    rev = rev * 10 + digit
    temp //= 10

print("Reversed number =", rev)

Java Program

import java.util.Scanner;

public class ReverseNumber {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        int temp = n;
        int rev = 0;

        while (temp != 0) {
            int digit = temp % 10;
            rev = rev * 10 + digit;
            temp /= 10;
        }

        System.out.println("Reversed number = " + rev);
    }
}

Q11. Print Triangle Pattern

C Program

#include <stdio.h>

int main() {
    int n;
    printf("Enter number of rows: ");
    scanf("%d", &n);

    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            printf("*");
        }
        printf("\n");
    }

    return 0;
}

Python Program

n = int(input("Enter number of rows: "))

for i in range(1, n + 1):
    print("*" * i)

Java Program

import java.util.Scanner;

public class TrianglePattern {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter number of rows: ");
        int n = sc.nextInt();

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

Q12. Sum of Digits

C Program

#include <stdio.h>

int main() {
    int n;
    int sum = 0;
    printf("Enter a number: ");
    scanf("%d", &n);

    int temp = n;
    if (temp < 0) temp = -temp;

    while (temp > 0) {
        sum += temp % 10;
        temp /= 10;
    }

    printf("Sum of digits = %d\n", sum);

    return 0;
}

Python Program

n = int(input("Enter a number: "))

temp = abs(n)
sum_digits = 0

while temp > 0:
    sum_digits += temp % 10
    temp //= 10

print("Sum of digits =", sum_digits)

Java Program

import java.util.Scanner;

public class SumOfDigits {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        int temp = Math.abs(n);
        int sum = 0;

        while (temp > 0) {
            sum += temp % 10;
            temp /= 10;
        }

        System.out.println("Sum of digits = " + sum);
    }
}

Q13. Largest Element in an Array

C Program

#include <stdio.h>

int main() {
    int n;
    printf("Enter number of elements: ");
    scanf("%d", &n);

    int a[100];
    printf("Enter %d elements:\n", n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &a[i]);
    }

    int max = a[0];
    for (int i = 1; i < n; i++) {
        if (a[i] > max) {
            max = a[i];
        }
    }

    printf("Largest element = %d\n", max);

    return 0;
}

Python Program

n = int(input("Enter number of elements: "))
arr = []

print("Enter elements:")
for _ in range(n):
    arr.append(int(input()))

max_val = arr[0]
for x in arr[1:]:
    if x > max_val:
        max_val = x

print("Largest element =", max_val)

Java Program

import java.util.Scanner;

public class LargestInArray {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter number of elements: ");
        int n = sc.nextInt();

        int[] arr = new int[n];
        System.out.println("Enter elements:");
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        int max = arr[0];
        for (int i = 1; i < n; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
        }

        System.out.println("Largest element = " + max);
    }
}

Q14. Count Even & Odd Numbers in an Array

C Program

#include <stdio.h>

int main() {
    int n;
    printf("Enter number of elements: ");
    scanf("%d", &n);

    int a[100];
    printf("Enter %d elements:\n", n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &a[i]);
    }

    int even = 0, odd = 0;
    for (int i = 0; i < n; i++) {
        if (a[i] % 2 == 0)
            even++;
        else
            odd++;
    }

    printf("Even count = %d\n", even);
    printf("Odd count = %d\n", odd);

    return 0;
}

Python Program

n = int(input("Enter number of elements: "))
arr = []

print("Enter elements:")
for _ in range(n):
    arr.append(int(input()))

even = 0
odd = 0

for x in arr:
    if x % 2 == 0:
        even += 1
    else:
        odd += 1

print("Even count =", even)
print("Odd count =", odd)

Java Program

import java.util.Scanner;

public class CountEvenOddInArray {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter number of elements: ");
        int n = sc.nextInt();

        int[] arr = new int[n];
        System.out.println("Enter elements:");
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        int even = 0, odd = 0;
        for (int x : arr) {
            if (x % 2 == 0)
                even++;
            else
                odd++;
        }

        System.out.println("Even count = " + even);
        System.out.println("Odd count = " + odd);
    }
}

Q15. Linear Search in an Array

C Program

#include <stdio.h>

int main() {
    int n, key;
    printf("Enter number of elements: ");
    scanf("%d", &n);

    int a[100];
    printf("Enter %d elements:\n", n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &a[i]);
    }

    printf("Enter element to search: ");
    scanf("%d", &key);

    int pos = -1;
    for (int i = 0; i < n; i++) {
        if (a[i] == key) {
            pos = i;
            break;
        }
    }

    if (pos == -1)
        printf("Element not found.\n");
    else
        printf("Element found at index %d\n", pos);

    return 0;
}

Python Program

n = int(input("Enter number of elements: "))
arr = []

print("Enter elements:")
for _ in range(n):
    arr.append(int(input()))

key = int(input("Enter element to search: "))

pos = -1
for i in range(n):
    if arr[i] == key:
        pos = i
        break

if pos == -1:
    print("Element not found.")
else:
    print("Element found at index", pos)

Java Program

import java.util.Scanner;

public class LinearSearch {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter number of elements: ");
        int n = sc.nextInt();

        int[] arr = new int[n];
        System.out.println("Enter elements:");
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        System.out.print("Enter element to search: ");
        int key = sc.nextInt();

        int pos = -1;
        for (int i = 0; i < n; i++) {
            if (arr[i] == key) {
                pos = i;
                break;
            }
        }

        if (pos == -1)
            System.out.println("Element not found.");
        else
            System.out.println("Element found at index " + pos);
    }
}

Q16. Palindrome String

C Program

#include <stdio.h>
#include <string.h>

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%99s", str);

    int i = 0;
    int j = strlen(str) - 1;
    int isPalindrome = 1;

    while (i < j) {
        if (str[i] != str[j]) {
            isPalindrome = 0;
            break;
        }
        i++;
        j--;
    }

    if (isPalindrome)
        printf("Palindrome\n");
    else
        printf("Not Palindrome\n");

    return 0;
}

Python Program

s = input("Enter a string: ")

if s == s[::-1]:
    print("Palindrome")
else:
    print("Not Palindrome")

Java Program

import java.util.Scanner;

public class PalindromeString {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a string: ");
        String s = sc.nextLine();

        String rev = new StringBuilder(s).reverse().toString();

        if (s.equals(rev))
            System.out.println("Palindrome");
        else
            System.out.println("Not Palindrome");
    }
}

Q17. Count Vowels in a String

C Program

#include <stdio.h>
#include <ctype.h>

int main() {
    char str[200];
    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);

    int count = 0;
    for (int i = 0; str[i] != '\0'; i++) {
        char ch = tolower(str[i]);
        if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
            count++;
    }

    printf("Number of vowels = %d\n", count);

    return 0;
}

Python Program

s = input("Enter a string: ")

vowels = "aeiouAEIOU"
count = 0

for ch in s:
    if ch in vowels:
        count += 1

print("Number of vowels =", count)

Java Program

import java.util.Scanner;

public class CountVowels {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a string: ");
        String s = sc.nextLine();

        int count = 0;
        String vowels = "aeiouAEIOU";

        for (int i = 0; i < s.length(); i++) {
            if (vowels.indexOf(s.charAt(i)) != -1) {
                count++;
            }
        }

        System.out.println("Number of vowels = " + count);
    }
}

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