C Programming Practice Exercises: Solutions and Explanations318

This comprehensive guide provides solutions and detailed explanations to a range of C programming practice exercises. Whether you're a beginner taking your first steps into the world of C or a more experienced programmer looking to solidify your understanding, this resource will help you navigate the complexities of the language and develop robust programming skills. We'll explore diverse problem-solving approaches, focusing on clarity, efficiency, and best practices. Remember, understanding the *why* behind the code is as crucial as understanding the *how*.

Exercise 1: Hello, World! with a Twist

Problem: Modify the classic "Hello, World!" program to display your name instead of "Hello, World!".

Solution:#include
int main() {
printf("Hello, [Your Name]!");
return 0;
}

Explanation: This exercise highlights the fundamental use of the `printf` function for outputting text to the console. Replacing "Hello, World!" with your name demonstrates the flexibility of string literals within the `printf` function. The `` character inserts a newline, moving the cursor to the next line after the output.

Exercise 2: Calculating the Area of a Rectangle

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

Solution:#include
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 exercise introduces user input using `scanf`. The `%f` format specifier indicates that we're expecting a floating-point number. The `&` operator provides the memory address of the variable where the input should be stored. The calculated area is then displayed using `printf` with `%.2f` to format the output to two decimal places.

Exercise 3: Finding the Largest of Three Numbers

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

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

Explanation: This exercise demonstrates the use of conditional statements (`if`). We initialize `largest` to the first number and then compare it sequentially with the other two, updating `largest` if a larger number is found. This approach can be extended to handle any number of inputs using loops (covered in later exercises).

Exercise 4: Factorial Calculation

Problem: Write a program that calculates the factorial of a non-negative integer entered by the user.

Solution:#include
int main() {
int n, i;
long long factorial = 1; // Use long long to handle larger factorials
printf("Enter a non-negative integer: ");
scanf("%d", &n);
if (n < 0) {
printf("Factorial is not defined for negative numbers.");
} else {
for (i = 1; i

2025-04-06

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