C Programming Codes

#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 = 0; i < exponent; i++) {
        result *= base;
    }

    printf("Result = %lldn", result);

    return 0;
}

Input: 2
Input: 3
Output: Result = 8

Input: 5
Input: 0
Output: Result = 1

Input: 3
Input: 4
Output: Result = 81

Input: 2
Input: 10
Output: Result = 1024

#include <stdio.h>

int main() {
    int num1, num2, max;

    scanf("%d %d", &num1, &num2);

    max = (num1 > num2) ? num1 : num2;

    for (;;) {
        if (max % num1 == 0 && max % num2 == 0) {
            printf("%d", max);
            break;
        }
        max++;
    }

    return 0;
}

Input: 12 18
Output: 36
Input: 5 7
Output: 35
Input: 2 4
Output: 4
Input: 15 25
Output: 75
Input: 1 10
Output: 10

#include <stdio.h>

int main() {
    int rows, i, j, space;

    scanf("%d", &rows);

    for (i = 1; i <= rows; i++) {
        for (space = i; space < rows; space++) {
            printf(" ");
        }
        for (j = 1; j <= (2 * i - 1); j++) {
            printf("*");
        }
        printf("n");
    }

    for (i = rows - 1; i >= 1; i--) {
        for (space = i; space < rows; space++) {
            printf(" ");
        }
        for (j = 1; j <= (2 * i - 1); j++) {
            printf("*");
        }
        printf("n");
    }

    return 0;
}

Input: 5
Output:
    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *

#include <stdio.h>

int main() {
  int rows, i, j, space;

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++) {
    for (space = i; space < rows; space++) {
      printf(" ");
    }

    for (j = 1; j <= (2 * i - 1); j++) {
      printf("*");
    }
    printf("n");
  }

  return 0;
}

// Code not available

#include <stdio.h>

int main() {
  int rows, i, j;

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; --i) {
    for (j = 1; j <= i; ++j) {
      printf("*");
    }
    printf("n");
  }

  return 0;
}

Input: 5
Output:
Enter the number of rows: *****
****
***
**
*

#include <stdio.h>

int main() {
  int rows;

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

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

  return 0;
}

Input: 5
Output: *
**
***
****
*****

#include <stdio.h>

int main() {
    int num, i;

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

    printf("Factors of %d are: ", num);

    for (i = 1; i <= num; ++i) {
        if (num % i == 0) {
            printf("%d ", i);
        }
    }

    printf("n");

    return 0;
}

Input: 12
Output: Factors of 12 are: 1 2 3 4 6 12

Input: 7
Output: Factors of 7 are: 1 7

Input: 25
Output: Factors of 25 are: 1 5 25

Input: 1
Output: Factors of 1 are: 1

#include <stdio.h>

int main() {
    int num, i, flag = 0;

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

    if (num <= 1) {
        printf("%d is not a prime number.n", num);
        return 0;
    }

    for (i = 2; i <= num / 2; ++i) {
        if (num % i == 0) {
            flag = 1;
            break;
        }
    }

    if (flag == 0)
        printf("%d is a prime number.n", num);
    else
        printf("%d is not a prime number.n", num);

    return 0;
}

Input: 7
Output: 7 is a prime number.

Input: 12
Output: 12 is not a prime number.

Input: 1
Output: 1 is not a prime number.

Input: 2
Output: 2 is a prime number.

Input: 0
Output: 0 is not a prime number.

Input: -5
Output: -5 is not a prime number.

#include <stdio.h>
#include <stdbool.h>

int main() {
    int start, end, i, j;
    bool isPrime;

    printf("Enter the starting number: ");
    scanf("%d", &start);

    printf("Enter the ending number: ");
    scanf("%d", &end);

    printf("Prime numbers between %d and %d are:n", start, end);

    for (i = start; i <= end; i++) {
        if (i <= 1)
            continue;

        isPrime = true;
        for (j = 2; j * j <= i; j++) {
            if (i % j == 0) {
                isPrime = false;
                break;
            }
        }

        if (isPrime) {
            printf("%d ", i);
        }
    }
    printf("n");
    return 0;
}

Input: 10
Input: 20
Output: Prime numbers between 10 and 20 are:
11 13 17 19
Input: 1
Input: 10
Output: Prime numbers between 1 and 10 are:
2 3 5 7
Input: 20
Input: 30
Output: Prime numbers between 20 and 30 are:
23 29
Input: 1
Input: 1
Output: Prime numbers between 1 and 1 are:

#include <stdio.h>

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

  printf("Enter the number of terms: ");
  scanf("%d", &n);

  printf("Fibonacci Series: ");

  for (i = 0; i < n; i++) {
    printf("%d ", first);
    next = first + second;
    first = second;
    second = next;
  }

  printf("n");
  return 0;
}

Input: 10
Output: Fibonacci Series: 0 1 1 2 3 5 8 13 21 34

#include <stdio.h>

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

int isStrong(int num) {
    int sum = 0;
    int temp = num;
    while (temp != 0) {
        int digit = temp % 10;
        sum += factorial(digit);
        temp /= 10;
    }
    return (sum == num);
}

int main() {
    int start, end;

    printf("Enter the starting number: ");
    scanf("%d", &start);

    printf("Enter the ending number: ");
    scanf("%d", &end);

    printf("Strong numbers between %d and %d are: ", start, end);
    for (int i = start; i <= end; i++) {
        if (isStrong(i)) {
            printf("%d ", i);
        }
    }
    printf("n");

    return 0;
}

Input: 1
Input: 150
Output: Strong numbers between 1 and 150 are: 1 2 145

#include <stdio.h>

int main() {
    int start, end, i, j, sum;

    printf("Enter the starting number: ");
    scanf("%d", &start);

    printf("Enter the ending number: ");
    scanf("%d", &end);

    printf("Perfect numbers between %d and %d are: ", start, end);

    for (i = start; i <= end; i++) {
        sum = 0;
        for (j = 1; j < i; j++) {
            if (i % j == 0) {
                sum += j;
            }
        }

        if (sum == i) {
            printf("%d ", i);
        }
    }
    printf("n");

    return 0;
}

Input: 1
Input: 10
Output: Perfect numbers between 1 and 10 are: 6
Input: 20
Input: 30
Output: Perfect numbers between 20 and 30 are: 28
Input: 1
Input: 500
Output: Perfect numbers between 1 and 500 are: 6 28 496
Input: 490
Input: 500
Output: Perfect numbers between 490 and 500 are: 496

#include <stdio.h>
#include <math.h>

int main() {
    int start, end, i, num, originalNum, remainder, n = 0;
    float result = 0.0;

    printf("Enter the start of the range: ");
    scanf("%d", &start);
    printf("Enter the end of the range: ");
    scanf("%d", &end);

    printf("Armstrong numbers between %d and %d are: ", start, end);

    for (i = start; i <= end; ++i) {
        originalNum = i;
        num = i;
        n = 0;
        result = 0.0;

        while (originalNum != 0) {
            originalNum /= 10;
            ++n;
        }

        originalNum = num;

        while (originalNum != 0) {
            remainder = originalNum % 10;
            result += pow(remainder, n);
            originalNum /= 10;
        }

        if ((int)result == num) {
            printf("%d ", num);
        }
    }

    printf("n");

    return 0;
}

Input: 100
Input: 500
Output: Armstrong numbers between 100 and 500 are: 153 370 371 407
Input: 1
Input: 10
Output: Armstrong numbers between 1 and 10 are: 1 2 3 4 5 6 7 8 9
Input: 0
Input: 0
Output: Armstrong numbers between 0 and 0 are: 0

#include <stdio.h>
#include <math.h>

int main() {
    int number, originalNumber, remainder, n = 0;
    float result = 0.0;

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

    originalNumber = number;

    // Count number of digits
    while (originalNumber != 0) {
        originalNumber /= 10;
        ++n;
    }

    originalNumber = number;

    // Calculate result
    while (originalNumber != 0) {
        remainder = originalNumber % 10;
        result += pow(remainder, n);
        originalNumber /= 10;
    }

    // Check if number is Armstrong
    if ((int)result == number)
        printf("%d is an Armstrong number.", number);
    else
        printf("%d is not an Armstrong number.", number);

    return 0;
}

Input: 153
Output: 153 is an Armstrong number.

Input: 120
Output: 120 is not an Armstrong number.

Input: 1634
Output: 1634 is an Armstrong number.

Input: 1234
Output: 1234 is not an Armstrong number.

#include <stdio.h>

int main() {
    int num, reversed_num = 0, remainder, original_num;

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

    original_num = num;

    for (; num != 0; num /= 10) {
        remainder = num % 10;
        reversed_num = reversed_num * 10 + remainder;
    }

    if (original_num == reversed_num)
        printf("%d is a palindrome.n", original_num);
    else
        printf("%d is not a palindrome.n", original_num);

    return 0;
}

Input: 121
Output: 121 is a palindrome.

Input: 123
Output: 123 is not a palindrome.

Input: 12321
Output: 12321 is a palindrome.

Input: 12345
Output: 12345 is not a palindrome.

Input: 1
Output: 1 is a palindrome.

Input: 0
Output: 0 is a palindrome.

#include <stdio.h>

int main() {
  int num, sum = 0, digit;

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

  if (num < 0) {
    printf("Please enter a positive integer.n");
    return 1;
  }

  for (; num != 0; num /= 10) {
    digit = num % 10;
    sum += digit;
  }

  printf("Sum of digits = %dn", sum);

  return 0;
}

Input: 12345
Output: Enter a positive integer: Sum of digits = 15

Input: 9876
Output: Enter a positive integer: Sum of digits = 30

Input: 0
Output: Enter a positive integer: Sum of digits = 0

Input: -123
Output: Enter a positive integer: Please enter a positive integer.

#include <stdio.h>

int main() {
    int num, i;

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

    for (i = 1; i <= 10; i++) {
        printf("%d * %d = %dn", num, i, num * i);
    }

    return 0;
}

Input: 5
Output: Enter an integer: 5 * 1 = 5
5 * 2 = 10
5 * 3 = 15
5 * 4 = 20
5 * 5 = 25
5 * 6 = 30
5 * 7 = 35
5 * 8 = 40
5 * 9 = 45
5 * 10 = 50

#include <stdio.h>

int main() {
    int num1, num2, gcd;

    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);

    while (num1 != num2) {
        if (num1 > num2) {
            num1 -= num2;
        } else {
            num2 -= num1;
        }
    }

    gcd = num1;

    printf("GCD = %d", gcd);

    return 0;
}

Input: 12 18
Output: Enter two integers: GCD = 6
Input: 25 15
Output: Enter two integers: GCD = 5
Input: 10 10
Output: Enter two integers: GCD = 10
Input: 48 18
Output: Enter two integers: GCD = 6