We can say ‘sum of numbers from 1 to n can be represented as sum of numbers from 1 to n1 plus n’ i.e. The sum of numbers from 1 to n = n + Sum of numbers from 1 to n-1 = n + n-1 + Sum of numbers from 1 to n-2 = […]
#include <stdio.h> // Function to calculate factorial int factorial(int n) { int fact = 1; for(int i = 1; i <= n; i++) { fact *= i; } return fact; } int main() { int num; printf(“Enter a positive integer: “); scanf(“%d”, &num); if(num < 0) { printf(“Factorial is not defined for negative numbers.\n”); } […]
Actual Arguments These are the real values or variables you pass to a function when calling it. They appear in the function call. int main() { int a = 10, b = 20; add(a, b); // a and b are actual arguments return 0; } Formal Arguments These are the placeholders or parameters defined in […]
#include <stdio.h> int main() { int i, j, isPrime; printf(“Prime numbers from 2 to 20 are:\n”); for (i = 2; i <= 20; i++) { // Outer loop: check each number from 2 to 20 isPrime = 1; // Assume i is prime for (j = 2; j < i; j++) { // Inner loop: […]
#include <stdio.h> int main() { int num, reversed = 0, remainder; // Input from user printf(“Enter an integer: “); scanf(“%d”, &num); while (num != 0) { remainder = num % 10; // Get the last digit reversed = reversed * 10 + remainder; // Build the reversed number num = num / 10; // Remove […]
Counting the number of digits in a number is a common beginner-level program in C. This helps in understanding how to use loops and arithmetic operations like division. #include <stdio.h> int main() { int num, count = 0; // Input from user printf(“Enter a number: “); scanf(“%d”, &num); // Handle 0 separately if (num == […]
A number is called a palindrome if it reads the same backward as forward. Examples: 121, 1331, 454 are palindrome numbers. #include int main() { int num, original, reversed = 0, remainder; // Input from user printf(“Enter a number: “); scanf(“%d”, &num); original = num; // Store original number // Reverse the number while (num […]
This program accepts a grade as input (like A, B, C, etc.) and displays the corresponding remark using conditional statements. This is a good practice for learning if-else or switch-case in C. #include <stdio.h> int main() { char grade; // Input from user printf(“Enter your grade (A, B, C, D, F): “); scanf(” %c”, &grade); […]
#include <stdio.h> int main() { int num1, num2; // Input two numbers from user printf(“Enter first number: “); scanf(“%d”, &num1); printf(“Enter second number: “); scanf(“%d”, &num2); // Check and display the relationship if (num1 > num2) { printf(“%d is greater than %d\n”, num1, num2); } else if (num1 < num2) { printf(“%d is less than […]
#include <stdio.h> int main() { int year; // Input year from user printf(“Enter a year: “); scanf(“%d”, &year); // Leap year logic if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) { printf(“%d is a leap year.\n”, year); } else { printf(“%d is not a leap […]
