Lab: for Loop

Program 1: Print Multiplication Table

Objective: Print the multiplication table of a number entered by the user.

#include <stdio.h>

void main() {
  int num,i,result;
  
  printf("Enter a number: ");
  scanf("%d", &num);
  
  for (i = 1; i <= 10; i++) {
    result=num*i;
    printf("%d x %d = %d\n", num, i, result);
  }
}

Program 2: Print First N Natural Numbers

Objective: Input a number N and print the first N natural numbers.

#include <stdio.h>

void main() {
  int N;

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

  for (int i = 1; i <= N; i++) {
    printf("%d ", i);
  }


}

Program 3: Print the Sum of the First N Natural Numbers

Objective: Input a number N and find the sum of all natural numbers from 1 to N

#include <stdio.h>

void main() {
  int N, sum = 0;

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

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

  printf("Sum of first %d natural numbers is: %d\n", N, sum);
  
}

Program 4: Sum of Digits of a Number

Objective: Input a number and find the sum of its digits.

#include <stdio.h>

void main() {
  int num, sum = 0, remainder;

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

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

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

}

Program 4: Sum of Even and Odd Numbers from 1 to N

Objective: Input a number N and find the sum of all even and odd numbers separately from 1 to N.

#include <stdio.h>

int main() {
  int N, sumEven = 0, sumOdd = 0;

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

  for (int i = 1; i <= N; i++) {
    if (i % 2 == 0) {
      sumEven += i;
    } 
    else 
    {
      sumOdd += i;
    }
  }
  printf("Sum of even numbers: %d\n", sumEven);
  printf("Sum of odd numbers: %d\n", sumOdd);
  return 0;
}

Complete Rest of the Programs

1. Print first N natural numbers.
2. Sum of first N natural numbers.
3. Multiplication table.
4. Find the factorial of a number.
5. Fibonacci series.
6. Check for a prime number.
7. Reverse a number.
8. Sum of digits.
9. Print patterns.
10. Sum of even and odd numbers from 1 to N.