C Programming Tutorial: Exercises and Solutions with Explanations325

Welcome to this comprehensive guide covering a selection of C programming exercises and their detailed solutions. This tutorial is designed to help you solidify your understanding of fundamental C concepts and build a stronger foundation in programming. Each exercise is carefully chosen to target specific skills, and the accompanying solutions provide not just the code but also explanations of the logic behind each step. Whether you're a beginner just starting your C programming journey or looking to refresh your skills, this resource will be invaluable.

Exercise 1: Hello, World! (Beginner)

Problem: Write a C program that prints "Hello, World!" to the console.

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

Explanation: This is the quintessential introductory C program. `#include <stdio.h>` includes the standard input/output library, providing functions like `printf`. `int main() { ... }` is the main function where the program execution begins. `printf("Hello, World!");` prints the string to the console, and `` adds a newline character. `return 0;` indicates successful program execution.

Exercise 2: Calculating the Area of a Rectangle (Beginner)

Problem: Write a C program that takes the length and width of a rectangle as input from the user and calculates its area.

Solution:
#include <stdio.h>
int main() {
float length, width, area;
printf("Enter the length of the rectangle: ");
scanf("%f", &length);
printf("Enter the width of the rectangle: ");
scanf("%f", &width);
area = length * width;
printf("The area of the rectangle is: %.2f", area);
return 0;
}

Explanation: This program demonstrates user input using `scanf`. It declares three floating-point variables to store the length, width, and area. `scanf("%f", &length);` reads a floating-point number from the user and stores it in the `length` variable. The area is calculated, and the result is printed using `printf` with `%.2f` to format the output to two decimal places.

Exercise 3: Finding the Largest of Three Numbers (Intermediate)

Problem: Write a C program that takes three numbers as input from the user and finds the largest among them.

Solution:
#include <stdio.h>
int main() {
float num1, num2, num3, largest;
printf("Enter three numbers: ");
scanf("%f %f %f", &num1, &num2, &num3);
largest = num1;
if (num2 > largest) {
largest = num2;
}
if (num3 > largest) {
largest = num3;
}
printf("The largest number is: %.2f", largest);
return 0;
}

Explanation: This program uses `if` statements to compare the three numbers. It initializes `largest` to the first number and then compares the other two, updating `largest` if a larger number is found. This demonstrates conditional logic in C.

Exercise 4: Factorial Calculation (Intermediate)

Problem: Write a C program to calculate the factorial of a given number using a loop.

Solution:
#include <stdio.h>
int main() {
int num, i, factorial = 1;
printf("Enter a non-negative integer: ");
scanf("%d", &num);
if (num < 0) {
printf("Factorial is not defined for negative numbers.");
} else {
for (i = 1; i

2025-04-26

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