C Exercises – Practice C Programming with Hands-On Examples
In this tutorial, you’ll find a collection of C programming exercises that will help you practice and improve your skills. Each exercise is designed to challenge your understanding of key C concepts, from basic syntax to more advanced topics like memory management and data structures.
🔹 Exercise 1: Print the First 10 Natural Numbers
Write a C program that prints the first 10 natural numbers (1 to 10) using a loop.
📝 Example 1: Print Natural Numbers
#include <stdio.h>
int main() {
int i;
for (i = 1; i <= 10; i++) {
printf("%d ", i); // Print numbers from 1 to 10
}
return 0;
}
🔹 Exercise 2: Check if a Number is Prime
Write a C program to check whether a given number is a prime number or not. A prime number is a number greater than 1 that is divisible only by 1 and itself.
📝 Example 2: Prime Number Check
#include <stdio.h>
int main() {
int num, i, isPrime = 1;
printf("Enter a number: ");
scanf("%d", &num);
for (i = 2; i <= num / 2; i++) {
if (num % i == 0) {
isPrime = 0;
break;
}
}
if (isPrime && num > 1) {
printf("%d is a prime number.\n", num);
} else {
printf("%d is not a prime number.\n", num);
}
return 0;
}
🔹 Exercise 3: Reverse a String
Write a C program to reverse a string entered by the user without using any library functions.
📝 Example 3: Reverse a String
#include <stdio.h>>
#include <string.h>
int main() {
char str[100], temp;
int i, j;
printf("Enter a string: ");
fgets(str, sizeof(str), stdin);
i = 0;
j = strlen(str) - 1;
while (i < j) {
temp = str[i];
str[i] = str[j];
str[j] = temp;
i++;
j--;
}
printf("Reversed string: %s\n", str);
return 0;
}
🔹 Exercise 4: Calculate Factorial of a Number
Write a C program to calculate the factorial of a given number using both an iterative and recursive approach.
📝 Example 4: Factorial of a Number (Iterative)
#include <stdio.h>
int main() {
int num, i, fact = 1;
printf("Enter a number: ");
scanf("%d", &num);
for (i = 1; i <= num; i++) {
fact *= i; // Multiply the current number with fact
}
printf("Factorial of %d is %d\n", num, fact);
return 0;
}
📝 Example 5: Factorial of a Number (Recursive)
#include <stdio.h>
int factorial(int n) {
if (n == 0) {
return 1; // Base case: factorial of 0 is 1
} else {
return n * factorial(n - 1); // Recursive call
}
}
int main() {
int num;
printf("Enter a number: ");
scanf("%d", &num);
printf("Factorial of %d is %d\n", num, factorial(num));
return 0;
}
🔹 Exercise 5: Fibonacci Series
Write a C program to generate the Fibonacci series up to a given number. The Fibonacci sequence starts with 0 and 1, and each subsequent number is the sum of the previous two.
📝 Example 6: Fibonacci Series
#include <stdio.h>
int main() {
int n, first = 0, second = 1, next;
printf("Enter the number of terms: ");
scanf("%d", &n);
printf("Fibonacci series: ");
for (int i = 1; i <= n; i++) {
if (i == 1) {
printf("%d ", first);
} else if (i == 2) {
printf("%d ", second);
} else {
next = first + second;
first = second;
second = next;
printf("%d ", next);
}
}
printf("\n");
return 0;
}
🔹 Conclusion
These exercises cover a range of basic C programming concepts, including loops, conditionals, recursion, and arrays. Working through these examples will help you solidify your understanding of core C programming techniques. As you advance, try creating more complex programs that combine these concepts to build more sophisticated solutions.
📝 Practice Time!
Continue practicing these exercises and experiment with variations of each one. You can also try implementing more challenging problems to further enhance your C programming skills.