Sudoku Source Code in C Language
Sudoku is a popular logic-based puzzle game that challenges your brain and reasoning skills. The goal of sudoku is to fill a 9x9 grid with numbers from 1 to 9, such that each row, column and 3x3 subgrid contains every number exactly once. Sudoku puzzles come in different levels of difficulty, from easy to evil, depending on how many numbers are given at the start.
In this article, we will show you how to create your own sudoku game using C language, a powerful and efficient programming language that allows low-level access to memory and hardware. C language is ideal for sudoku programming because it has a simple syntax, a rich set of operators and functions, and a fast execution speed. We will use Code Blocks IDE, a free and open source integrated development environment for C/C++ programming.
sudoku source code in c download
DOWNLOAD: https://urlcod.com/2vxOnl
Sudoku Game Code in C Language
To create a sudoku game code in C language, we will follow these steps:
How to create a new project in Code Blocks IDE
Open Code Blocks IDE and click "Create a new project".
Select "Console application" and click "Next".
Choose "C" as the language and click "Next".
Name your project as "Sudoku" and choose a location for it. Click "Next" and then "Finish".
A new project with a main.c file will be created.
How to fill the board with random numbers
First, we need to declare some variables and constants for our program. We will use a two-dimensional array of integers to store the sudoku board, a constant N to represent the size of the board (9), and some variables for loops and random numbers.
We will also include some header files for standard input/output functions, time functions, and assert functions.
#include <stdio.h> #include <stdlib.h> #include <time.h> #include <assert.h> #define N 9 // size of the board int board[N][N]; // sudoku board int i, j, k; // loop variables int num; // random number int row, col; // board coordinates int count; // number of filled cells srand(time(NULL)); // seed for random number generator
Next, we need to fill the board with random numbers from 1 to 9, such that each number appears only once in each row, column and subgrid. We will use a nested loop to iterate over each cell of the board, and a do-while loop to generate a random number until it is valid for that cell.
We will also use a function called checkvalid() to check if a given number is valid for a given cell. This function will return 1 if the number is already present in the same row, column or subgrid, or 0 otherwise.
// function to check if a number is valid for a cell int checkvalid(int num, int row, int col) { // check row for (j = 0; j
// check column for (i = 0; i
How to check if the board is valid and solvable
After filling the board with random numbers, we need to check if the board is valid and solvable. A valid board is one that follows the sudoku rules, and a solvable board is one that has a unique solution.
We will use a function called checksolvable() to check if the board is solvable. This function will use a backtracking algorithm to try all possible values for each empty cell, and return 1 if a solution is found, or 0 otherwise.
We will also use a function called removecell() to remove some numbers from the board to create empty cells. This function will take a parameter k, which represents the number of cells to be removed. We will use a random number generator to select the cells to be removed.
// function to check if the board is solvable int checksolvable() int row, col; // find an empty cell for (row = 0; row 0) row = rand() % N; // generate a random row index col = rand() % N; // generate a random column index if (board[row][col] != 0) // if cell is not empty, remove it board[row][col] = 0; k--; // decrement number of cells to be removed
How to display the board and user input
Next, we need to display the board and user input. We will use a function called displayboard() to print the board on the console. This function will use some formatting characters to create a grid-like appearance.
// function to display the board void displayboard() printf("\n"); for (i = 0; i
How to solve the board using backtracking algorithm
Finally, we need to solve the board using a backtracking algorithm. This algorithm will try all possible values for each empty cell, and backtrack if a dead end is reached.
We will use a function called solveboard() to implement this algorithm. This function will be similar to the checksolvable() function, except that it will also display the board and the solution steps.
// function to solve the board int solveboard() int row, col; // find an empty cell for (row = 0; row
Conclusion
random numbers, check if the board is valid and solvable, display the board and user input, and solve the board using a backtracking algorithm. We have also provided the source code and the output of the program.
Sudoku game is a fun and challenging way to exercise your brain and improve your logic skills. You can download the source code from this link and run it on your computer. You can also modify the code to create different levels of difficulty, add graphics and sound effects, or explore other applications of C language.
We hope you enjoyed this article and learned something new. If you have any questions or feedback, please let us know in the comments below. Happy coding!
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FAQs
What are the basic rules of sudoku?
The basic rules of sudoku are:
The board is a 9x9 grid divided into 9 3x3 subgrids.
The goal is to fill the board with numbers from 1 to 9, such that each row, column and subgrid contains every number exactly once.
Some numbers are given at the start as clues. The difficulty level depends on how many numbers are given and where they are placed.
You cannot change the given numbers. You can only fill the empty cells with valid numbers.
You can use logic and deduction to find the valid numbers for each cell. You do not need to guess or use trial and error.
What are some tips and tricks for solving sudoku puzzles?
Some tips and tricks for solving sudoku puzzles are:
Start with the easy cells. Look for rows, columns or subgrids that have only one empty cell or only one possible value for an empty cell.
Use elimination. If a number is already present in a row, column or subgrid, you can eliminate that number from the other cells in that row, column or subgrid.
Use pencil marks. You can write down the possible values for each cell in small digits. This will help you keep track of the candidates and eliminate them as you progress.
Look for patterns. You can use various techniques such as naked pairs, hidden singles, x-wing, swordfish, etc. to identify patterns and eliminate candidates. You can learn more about these techniques from online tutorials or books.
Check your work. You can use a solver tool or an online checker to verify your solution or find your mistakes. However, do not rely on these tools too much, as they may spoil the fun and challenge of solving sudoku puzzles.
How can I modify the code to generate different levels of difficulty?
You can modify the code to generate different levels of difficulty by changing the parameter k in the removecell() function. This parameter represents the number of cells to be removed from the board. The higher the value of k, the more cells are removed, and the harder the puzzle becomes.
For example, you can change k to 20 for an easy level, 40 for a medium level, 60 for a hard level, or 80 for an evil level. You can also experiment with different values of k to create your own custom levels.
How can I add graphics and sound effects to the game?
You can add graphics and sound effects to the game by using some libraries or frameworks that support C language. For example, you can use SDL (Simple DirectMedia Layer), a cross-platform development library that provides low-level access to audio, keyboard, mouse, joystick, and graphics hardware.
You can also use Allegro, a game programming library that offers functions for graphics, sound, input devices, timers, etc. Another option is SFML (Simple and Fast Multimedia Library), a modern multimedia library that provides a simple interface to various components of your PC.
You will need to install these libraries or frameworks on your computer and link them to your project. You will also need to modify your code to use their functions and features. You can find tutorials and examples on how to use these libraries or frameworks online or in books.
What are some other applications of C language?
C language is one of the most widely used programming languages in the world. It has many applications in various fields and domains, such as:
Operating systems: C language is used to develop operating systems such as Windows, Linux, Unix, etc.
robots, cars, appliances, etc.
Software development: C language is used to create software applications such as compilers, editors, databases, games, etc.
Scientific computing: C language is used to perform complex calculations and simulations for fields such as physics, chemistry, biology, engineering, etc.
Web development: C language is used to create web servers and web applications that handle requests and responses over the internet.
Security: C language is used to implement encryption and decryption algorithms that protect data and communication from unauthorized access.
C language is also the basis for many other programming languages such as C++, Java, Python, etc. Learning C language can help you understand the fundamentals of programming and enhance your skills and knowledge. 44f88ac181
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