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Q1: Write a program that takes an integer as input and checks whether it is even or odd using conditional statements. Display an appropriate message.

output.cpp

// C code
#include <stdio.h>

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);

    if (num % 2 == 0) {
        printf("The number is even.\n");
    } else {
        printf("The number is odd.\n");
    }

    return 0;
}

Q2: Create a program that takes a user's age as input and determines if he is eligible to vote (18 years or older) or not using conditional statements.

output.cpp

// C code
#include <stdio.h>

int main() {
    int age;
    printf("Enter your age: ");
    scanf("%d", &age);

    if (age >= 18) {
        printf("You are eligible to vote.\n");
    } else {
        printf("You are not eligible to vote.\n");
    }

    return 0;
}

Q3: Write a program that takes three numbers as input and finds the largest among them using if-else statements.

output.cpp

// C code
#include <stdio.h>

int main() {
    int num1, num2, num3;
    printf("Enter three numbers: ");
    scanf("%d %d %d", &num1, &num2, &num3);

    int largest = num1;

    if (num2 > largest) {
        largest = num2;
    }

    if (num3 > largest) {
        largest = num3;
    }

    printf("The largest number is: %d\n", largest);

    return 0;
}

Q4: Create a program that calculates the total cost of purchasing items in a shopping cart. The program should ask for the price and quantity of each item and apply a discount if the total cost exceeds a certain amount using if-else statements.

output.cpp

// C code
#include <stdio.h>

int main() {
    double totalCost = 0;

    for (int i = 1; i <= 3; i++) {
        double price, quantity;
        printf("Enter the price and quantity for item %d: ", i);
        scanf("%lf %lf", &price, &quantity);
        totalCost += (price * quantity);
    }

    if (totalCost > 100) {
        totalCost -= (totalCost * 0.1); // Apply a 10% discount for a total cost above $100
    }

    printf("Total cost after discount: $%.2lf\n", totalCost);

    return 0;
}

Q5: Use switch statement to make a simple calculator.

output.cpp

// C code
#include <stdio.h>

int main() {
    char operator;
    double num1, num2;

    printf("Enter an operator (+, -, *, /): ");
    scanf(" %c", &operator);

    printf("Enter two numbers: ");
    scanf("%lf %lf", &num1, &num2);

    switch (operator) {
        case '+':
            printf("Result: %.2lf\n", num1 + num2);
            break;
        case '-':
            printf("Result: %.2lf\n", num1 - num2);
            break;
        case '*':
            printf("Result: %.2lf\n", num1 * num2);
            break;
        case '/':
            if (num2 == 0) {
                printf("Error: Division by zero is not allowed.\n");
            } else {
                printf("Result: %.2lf\n", num1 / num2);
            }
            break;
        default:
            printf("Error: Invalid operator.\n");
    }

    return 0;
}

Q6: Write a program that asks the user for a grade (A, B, C, D, or F) and provides a message indicating their performance (e.g., "Excellent," "Good," "Satisfactory," "Pass," "Fail") using a switch statement (C, C++, Java) or if-else statements (Python).

output.cpp

// C code
#include <stdio.h>

int main() {
    char grade;
    printf("Enter your grade (A, B, C, D, or F): ");
    scanf(" %c", &grade);

    switch (grade) {
        case 'A':
            printf("Excellent\n");
            break;
        case 'B':
            printf("Good\n");
            break;
        case 'C':
            printf("Satisfactory\n");
            break;
        case 'D':
            printf("Pass\n");
            break;
        case 'F':
            printf("Fail\n");
            break;
        default:
            printf("Invalid grade\n");
    }

    return 0;
}

Q7: Write a program that takes three integers as input and determines if they can form the sides of a triangle. If yes, specify whether it's an equilateral, isosceles, or scalene triangle.

output.cpp

// C code
#include <stdio.h>

int main() {
    int side1, side2, side3;
    printf("Enter three integers representing the sides of a triangle: ");
    scanf("%d %d %d", &side1, &side2, &side3);

    if (side1 + side2 > side3 && side1 + side3 > side2 && side2 + side3 > side1) {
        if (side1 == side2 && side2 == side3) {
            printf("It's an equilateral triangle.\n");
        } else if (side1 == side2 || side2 == side3 || side1 == side3) {
            printf("It's an isosceles triangle.\n");
        } else {
            printf("It's a scalene triangle.\n");
        }
    } else {
        printf("These sides cannot form a triangle.\n");
    }

    return 0;
}

Q8: Create a program that simulates a simple ATM machine. Allow users to check their balance, deposit funds, and withdraw money. Ensure that the user cannot withdraw more money than their account balance. Use if-else statements for handling these operations.

output.cpp

// C code
#include <stdio.h>

int main() {
    double balance = 1000.0;
    int choice;
    double amount;

    while (1) {
        printf("ATM Menu:\n");
        printf("1. Check Balance\n");
        printf("2. Deposit\n");
        printf("3. Withdraw\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                printf("Your balance is $%.2lf\n", balance);
                break;
            case 2:
                printf("Enter the amount to deposit: $");
                scanf("%lf", &amount);
                balance += amount;
                printf("Deposited $%.2lf. Your balance is now $%.2lf\n", amount, balance);
                break;
            case 3:
                printf("Enter the amount to withdraw: $");
                scanf("%lf", &amount);
                if (amount > balance) {
                    printf("Insufficient balance. Withdrawal failed.\n");
                } else {
                    balance -= amount;
                    printf("Withdrawn $%.2lf. Your balance is now $%.2lf\n", amount, balance);
                }
                break;
            case 4:
                printf("Thank you for using the ATM. Goodbye!\n");
                return 0;
            default:
                printf("Invalid choice. Please select a valid option.\n");
        }
    }

    return 0;
}

Q9: Write a program that calculates the income tax based on the annual income of a person. The tax rates can vary depending on the income range. Use conditional statements to determine the tax amount.

output.cpp

// C code
#include <stdio.h>

int main() {
    double income, tax;

    printf("Enter your annual income: $");
    scanf("%lf", &income);

    if (income <= 10000) {
        tax = 0;
    } else if (income <= 50000) {
        tax = 0.1 * (income - 10000);
    } else if (income <= 100000) {
        tax = 0.1 * 40000 + 0.2 * (income - 50000);
    } else {
        tax = 0.1 * 40000 + 0.2 * 50000 + 0.3 * (income - 100000);
    }

    printf("Your income tax is: $%.2lf\n", tax);

    return 0;
}

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Conditional Statements(If-else and Switch):

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