C Programming Tutorial: Solutions to Common Exercises178

This comprehensive guide provides solutions to common exercises found in C programming tutorials. Whether you're a beginner grappling with the basics or a more experienced programmer looking to solidify your understanding, this resource offers detailed explanations and optimized code examples. We'll cover a range of topics, from fundamental data types and control structures to more advanced concepts like pointers and functions. Remember, understanding the *why* behind the code is just as important as the code itself, so we'll strive to explain the rationale behind each solution.

Section 1: Basic Data Types and Input/Output

Let's start with some fundamental exercises involving data types and input/output operations. A common exercise involves calculating the area of a rectangle given its length and width. Here's a C program to accomplish this:```c
#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;
}
```

This program first declares three floating-point variables: `length`, `width`, and `area`. `scanf` is used to read the length and width from the user's input. The area is calculated and then printed to the console using `printf`, formatted to two decimal places. Remember to always include the `stdio.h` header file for standard input/output functions.

Another common exercise involves converting temperatures between Celsius and Fahrenheit. Here's a solution demonstrating this:```c
#include
int main() {
float celsius, fahrenheit;
int choice;
printf("1. Celsius to Fahrenheit");
printf("2. Fahrenheit to Celsius");
printf("Enter your choice: ");
scanf("%d", &choice);
if (choice == 1) {
printf("Enter temperature in Celsius: ");
scanf("%f", &celsius);
fahrenheit = (celsius * 9.0 / 5.0) + 32.0;
printf("Temperature in Fahrenheit: %.2f", fahrenheit);
} else if (choice == 2) {
printf("Enter temperature in Fahrenheit: ");
scanf("%f", &fahrenheit);
celsius = (fahrenheit - 32.0) * 5.0 / 9.0;
printf("Temperature in Celsius: %.2f", celsius);
} else {
printf("Invalid choice.");
}
return 0;
}
```

This program utilizes an `if-else` statement to handle user input and perform the appropriate conversion. It demonstrates conditional logic and user interaction, crucial aspects of C programming.

Section 2: Control Structures and Loops

Many exercises involve practicing control structures like `for`, `while`, and `do-while` loops. A classic example is calculating the factorial of a number:```c
#include
int main() {
int n, i, factorial = 1;
printf("Enter a positive integer: ");
scanf("%d", &n);
if (n < 0) {
printf("Factorial is not defined for negative numbers.");
} else {
for (i = 1; i

2025-06-14

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