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#include <stdio.h> int main() { printf("Hello, world!\n"); return 0; }

A simple C program that prints 'Hello, world!' to the console.

#include <stdio.h> int factorial(int n) { if (n == 0) return 1; else return n * factorial(n - 1); } int main() { int n = 5; printf("Factorial of %d is %d\n", n, factorial(n)); return 0; }

A C program to calculate the factorial of a number using recursion.

#include <stdio.h> int main() { int n, sum = 0; printf("Enter a number: "); scanf("%d", &n); for (int i = 1; i <= n; i++) { sum += i; } printf("Sum of first %d natural numbers is %d\n", n, sum); return 0; }

A C program to calculate the sum of the first 'n' natural numbers.

#include <stdio.h> int main() { double a, b, product; printf("Enter two numbers: "); scanf("%lf %lf", &a, &b); product = a * b; printf("Product = %.2lf", product); return 0; }

A C Program to Multiply Two Numbers

#include <stdio.h> int main() { printf("Hello, World!"); return 0; }

Program to Display Hello, World!

#include <stdio.h> int main() { int number; printf("Enter an integer:"); scanf("%d", &number); printf("You entered: %d", number); return 0;}

A C Program to Print an Integer

#include <stdio.h> int main() { int number; printf("Enter an integer:"); scanf("%d", &number); // displays output printf("You entered: %d", number); return 0; }

A Program to Print an Integer

#include <stdio.h> int main() { char c; printf("Enter a character:"); scanf("%c", &c); // %d displays the integer value of a character // %c displays the actual character printf("ASCII value of %c = %d", c, c); return 0; }

A Program to Print SCII Value

#include <stdio.h> int main() { int dividend, divisor, quotient, remainder; printf("Enter dividend:"); printf("Enter divisor:"); scanf("%d", &dividend); scanf("%d", &divisor); // Computes quotient quotient = dividend / divisor; // Computes remainder remainder = dividend % divisor; printf("Quotient = %d ", quotient); return 0; }

C Program to Compute Quotient and Remainder

#include<stdio.h> int main() { int intType; float floatType; double doubleType; char charType; // sizeof evaluates the size of a variable printf("Size of int: %zu bytes ", sizeof(intType)); printf("Size of float: %zu bytes ", sizeof(floatType)); printf("Size of double: %zu bytes ", sizeof(doubleType)); printf("Size of char: %zu byte ", sizeof(charType)); return 0; }

C Program to Find the Size of int, float, double and char

#include <stdio.h> int main() { int a; long b; // equivalent to long int b; long long c; // equivalent to long long int c; double e; long double f; printf("Size of int = %zu bytes ", sizeof(a)); printf("Size of long int = %zu bytes ", sizeof(b)); printf("Size of long long int = %zu bytes ", sizeof(c)); printf("Size of double = %zu bytes ", sizeof(e)); printf("Size of long double = %zu bytes ", sizeof(f)); return 0; }

C Program to Demonstrate the Working of Keyword long

#include<stdio.h> int main() { double first, second, temp; printf("Enter first number:"); scanf("%lf", &first); printf("Enter second number: "); scanf("%lf", &second); // value of first is assigned to temp temp = first; // value of second is assigned to first first = second; // value of temp (initial value of first) is assigned to second second = temp; // %.2lf displays number up to 2 decimal points printf(" After swapping, first number = %.2lf ", first); printf("After swapping, second number = %.2lf", second); return 0; }

C Program to Swap Two Numbers

#include <stdio.h> int main() { int num; printf("Enter an integer: "); scanf("%d", &num); // true if num is perfectly divisible by 2 if(num % 2 == 0) printf("%d is even.", num); else printf("%d is odd.", num); return 0; }

C Program to Check Whether a Number is Even or Odd

#include <stdio.h> int main() { char c; int lowercase_vowel, uppercase_vowel; printf("Enter an alphabet:"); scanf("%c", &c); // evaluates to 1 if variable c is a lowercase vowel lowercase_vowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'); // evaluates to 1 if variable c is a uppercase vowel uppercase_vowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U'); // evaluates to 1 (true) if c is a vowel if (lowercase_vowel || uppercase_vowel) printf("%c is a vowel.", c); else printf("%c is a consonant.", c); return 0;}

C Program to Check Whether a Character is a Vowel or Consonant

#include <stdio.h> int main() { double n1, n2, n3; printf("Enter three different numbers: "); scanf("%lf %lf %lf", &n1, &n2, &n3); // if n1 is greater than both n2 and n3, n1 is the largest if(n1 >= n2 && n1 >= n3) printf("%.2f is the largest number.", n1); // if n2 is greater than both n1 and n3, n2 is the largest if (n2 >= n1 && n2 >= n3) printf("%.2f is the largest number.", n2); // if n3 is greater than both n1 and n2, n3 is the largest if (n3 >= n1 && n3 >= n2) printf("%.2f is the largest number.", n3); return 0;}

C Program to Find the Largest Number Among Three Numbers usinf if statement

#include <stdio.h> int main() { double n1, n2, n3; printf("Enter three different numbers:"); scanf("%lf %lf %lf", &n1, &n2, &n3); // if n1 is greater than both n2 and n3, n1 is the largest if (n1 >= n2 && n1 >= n3) printf("%.2f is the largest number.", n1); // if n2 is greater than both n1 and n3, n2 is the largest if (n2 >= n1 && n2 >= n3) printf("%.2f is the largest number.", n2); // if n3 is greater than both n1 and n2, n3 is the largest if (n3 >= n1 && n3 >= n2) printf("%.2f is the largest number.", n3); return 0; }

C Program to Find the Largest Number Among Three Numbers using if else statements

#include <math.h> #include <stdio.h> int main() { double a, b, c, discriminant, root1, root2, realPart, imagPart; printf("Enter coefficients a, b and c:"); scanf("%lf %lf %lf", &a, &b, &c); discriminant = b * b - 4 * a * c; // condition for real and different roots if (discriminant > 0) { root1 = (-b + sqrt(discriminant)) / (2 * a); root2 = (-b - sqrt(discriminant)) / (2 * a); printf("root1 = %.2lf and root2 = %.2lf", root1, root2); } // condition for real and equal roots else if (discriminant == 0) { root1 = root2 = -b / (2 * a); printf("root1 = root2 = %.2lf;", root1); } // if roots are not real else { realPart = -b / (2 * a); imagPart = sqrt(-discriminant) / (2 * a); printf("root1 = %.2lf+%.2lfi and root2 = %.2f-%.2fi", realPart, imagPart, realPart, imagPart); } return 0; }

C Program to Find the Roots of a Quadratic Equation

#include <stdio.h> int main() { double n1, n2, n3; printf("Enter three numbers:"); scanf("%lf %lf %lf", &n1, &n2, &n3); // outer if statement if (n1 >= n2) { // inner if...else if (n1 >= n3) printf("%.2lf is the largest number.", n1); else printf("%.2lf is the largest number.", n3); } // outer else statement else { // inner if...else if (n2 >= n3) printf("%.2lf is the largest number.", n2); else printf("%.2lf is the largest number.", n3); } return 0;}

C Program to Find the Largest Number Among Three Numbers using nested if statement

#include <stdio.h> int main() { int year; printf("Enter a year:"); scanf("%d", &year); // leap year if perfectly divisible by 400 if (year % 400 == 0) { printf("%d is a leap year.", year); } // not a leap year if divisible by 100 // but not divisible by 400 else if (year % 100 == 0) { printf("%d is not a leap year.", year); } // leap year if not divisible by 100 // but divisible by 4 else if (year % 4 == 0) { printf("%d is a leap year.", year); } // all other years are not leap years else { printf("%d is not a leap year.", year); } return 0; }

C Program to Check Leap Year

#include <stdio.h> int main() { double num; printf("Enter a number:"); scanf("%lf", &num); if (num <= 0.0) { if (num == 0.0) printf("You entered 0."); else printf("You entered a negative number."); } else printf("You entered a positive number."); return 0; }

C Program to Check Whether a Number is Positive or Negative

#include <stdio.h> int main() { char c; printf("Enter a character:"); scanf("%c", &c); if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) printf("%c is an alphabet.", c); else printf("%c is not an alphabet.", c); return 0;}

C Program to Check Whether a Character is an Alphabet or not