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Q1: Write a program that calculates the sum of all numbers from 1 to N using loops.

output.cpp

// C code
#include <stdio.h>

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

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

    printf("The sum of numbers from 1 to %d is: %d\n", N, sum);

    return 0;
}

Q2: Write a program to calculate the factorial of a given number using loops.

output.cpp

// C code
#include <stdio.h>

int main() {
    int number;
    long long factorial = 1;

    printf("Enter a non-negative integer: ");
    scanf("%d", &number);

    if (number < 0) {
        printf("Factorial is not defined for negative numbers.\n");
    } else {
        for (int i = 1; i <= number; i++) {
            factorial *= i;
        }
        printf("Factorial of %d is %lld\n", number, factorial);
    }

    return 0;
}

Q3: Print all even numbers from 1 to N using a loop.

output.cpp

// C code
#include <stdio.h>

int main() {
    int N;

    printf("Enter a positive integer N: ");
    scanf("%d", &N);

    printf("Even numbers from 1 to %d are: ", N);
    for (int i = 2; i <= N; i += 2) {
        printf("%d ", i);
    }

    printf("\n");

    return 0;
}

Q4: Generate a multiplication table for a given number from 1 to 10 using loops.

output.cpp

// C code
#include <stdio.h>

int main() {
    int number;

    printf("Enter a number for the multiplication table: ");
    scanf("%d", &number);

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

    return 0;
}

Q5: Write a program to check if a given number is prime or not using loops.

output.cpp

// C code
#include <stdio.h>

int main() {
    int number, isPrime = 1; // Assume the number is prime initially

    printf("Enter a positive integer: ");
    scanf("%d", &number);

    if (number <= 1) {
        isPrime = 0; // Numbers less than or equal to 1 are not prime
    } else {
        for (int i = 2; i <= number / 2; i++) {
            if (number % i == 0) {
                isPrime = 0; // Number is not prime
                break;
            }
        }
    }

    if (isPrime) {
        printf("%d is a prime number.\n", number);
    } else {
        printf("%d is not a prime number.\n", number);
    }

    return 0;
}

Q6: Generate the first N numbers of the Fibonacci sequence using loops.

output.cpp

// C code
#include <stdio.h>

int main() {
    int N, i;
    long long first = 0, second = 1, next;

    printf("Enter the value of N: ");
    scanf("%d", &N);

    printf("Fibonacci Sequence for first %d numbers:\n", N);

    for (i = 1; i <= N; i++) {
        if (i == 1) {
            printf("%lld, ", first);
        } else if (i == 2) {
            printf("%lld, ", second);
        } else {
            next = first + second;
            printf("%lld, ", next);
            first = second;
            second = next;
        }
    }

    printf("\n");

    return 0;
}

Q7: Write a program to check if a given string or number is a palindrome using loops.

output.cpp

// C code
#include <stdio.h>

int main() {
    int number, originalNumber, reverseNumber = 0, remainder;

    printf("Enter a number: ");
    scanf("%d", &number);

    originalNumber = number;

    while (number != 0) {
        remainder = number % 10;
        reverseNumber = reverseNumber * 10 + remainder;
        number /= 10;
    }

    if (originalNumber == reverseNumber) {
        printf("%d is a palindrome.\n", originalNumber);
    } else {
        printf("%d is not a palindrome.\n", originalNumber);
    }

    return 0;
}

Q8: Find the prime factorization of a given number using loops.

output.cpp

// C code
#include <stdio.h>

int main() {
    int number;

    printf("Enter a positive integer: ");
    scanf("%d", &number);

    printf("Prime factorization of %d is: ", number);

    for (int i = 2; i <= number; i++) {
        while (number % i == 0) {
            printf("%d ", i);
            number /= i;
        }
    }

    printf("\n");

    return 0;
}

Q9: Write a program to calculate the power of a number (e.g., a^b) using loops.

output.cpp

// C code
#include <stdio.h>

int main() {
    int base, exponent;
    long long result = 1;

    printf("Enter the base: ");
    scanf("%d", &base);
    printf("Enter the exponent: ");
    scanf("%d", &exponent);

    for (int i = 1; i <= exponent; i++) {
        result *= base;
    }

    printf("%d^%d = %lld\n", base, exponent, result);

    return 0;
}

Q10: Take two numbers as input from the user. Find the greatest common divisor (GCD) and least common multiple (LCM) of the two numbers. Use for loop for this purpose.

output.cpp

// C code
#include <stdio.h>

int main() {
    int num1, num2;

    printf("Enter the first number: ");
    scanf("%d", &num1);
    printf("Enter the second number: ");
    scanf("%d", &num2);

    int a = num1, b = num2;
    
    while (a != b) {
        if (a > b) {
            a -= b;
        } else {
            b -= a;
        }
    }
    
    int gcd = a;
    int lcm = (num1 * num2) / gcd;

    printf("GCD of %d and %d is %d\n", num1, num2, gcd);
    printf("LCM of %d and %d is %d\n", num1, num2, lcm);

    return 0;
}

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