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C Program to Count the Number of Characters Words and Lines in a file
In this tutorial, we will write a C program to count the number of characters words, and lines in a text file. Before that, you may go through the following C topics.
- C file I/O
Explanation: The program takes the user input for the file name or file path (if not present in the same directory). Then computes using while loop.

There are three integer variables in a program whose values are incremented by one whenever the condition is fulfilled. When the file reaches the end of the file, the execution control comes out of the loop and finally displays the counted result.

C Program to count Number of Characters Words and Lines in a file

Source code: Write a C program to count characters, words, and lines in a text file.
```
#include <stdio.h>
#include <stdlib.h>

int main()
{
   FILE * file;
   char fileName[100], ch;
   int characters, words, lines;

   printf("Enter the file name: ");
   scanf("%s", fileName);

   // open file in read mode
   file = fopen(fileName, "r");
   if (file == NULL)
   {
      printf("Unable to open the file");
      exit(EXIT_FAILURE);
   }

   characters = words = lines = 0;
   while ((ch = fgetc(file)) != EOF)
   {
      characters++;

      //check for lines
      if (ch == '\n' || ch == '\0')
         lines++;

      //check for words
      if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\0')
         words++;
   }

   if (characters > 0)
   {
      words++;
      lines++;
   }

   //Display
   printf("\nTotal Number of characters: %d", characters);
   printf("\nTotal Number of words:  %d", words);
   printf("\nTotal Number of lines:  %d", lines);

   fclose(file);

   return 0;
}
```
Output:

The content inside the test.txt:

Hello!
This is simple2code.com
You can learn coding tutorials and programs from the beginning.
10 September 2021
C Program to Count the Number of Lines in a File
In this tutorial, we will write a C Program to find the number of lines in a text file. Before that, you may go through the following C topics.
- C file I/O
Explanation: The program asks the user to enter the file name or file path (if not present in the same directory). If the file is not present then it will throw a message else it will continue the counting process.

First, the file checks if the starting is EOF or not, if not then the count will increase to 1 (if this part is not checked then the count will show one less result than the actual number of lines present), and then the counting begins using a while loop. And it increases the count when a newline is found every time inside a file.

C Program to Count the Number of Lines in a File

Source code: Count the number of lines in a file in C
```
#include <stdio.h>
#define FILE_NAME_SIZE 100

int main()
{
   FILE * fptr;
   int count = 0;
   char fileName[FILE_NAME_SIZE], ch;

   printf("Enter the name of the file: ");
   scanf("%s", fileName);

   // Opening the file and check for its existence
   fptr = fopen(fileName, "r");
   if (fptr == NULL)
   {
      printf("Could not open file.");
      return 0;
   }

   ch = getc(fptr);
   //if file is not empty then count the first line as 1
   if (ch != EOF)
      count++;

   // extracting the lines
   while (ch != EOF)
   {
      // if character id newline
      if (ch == '\n' || ch == '\0')
         count = count + 1;

      ch = getc(fptr);
   }

   fclose(fptr);
   printf("Number of line present in %s: %d ", fileName, count);

   return 0;
}
```
Output:

The content inside the test.txt:

Hello!
This is simple2code.com
You can learn coding tutorials and programs from the beginning.
10 September 2021
C Program to Merge Two Files
In this tutorial, we will write a C Program to merge the contents of two files into a third file. Before that, you may go through the following C topics.
- C file I/O
Explanation: The program will ask for the two names of the file from where the content is copied and then ask for the third file name where both the files are concatenated and copied there. If the third file is not present then the program will automatically create a file with the entered name.

Lastly, check the third file which will be present in the same directory as the source code.

C Program to Merge Two Files
```
#include <stdio.h>
#include <stdlib.h>

int main()
{
   FILE *fp1, *fp2, *fp3;

   char ch, file1[20], file2[20], file3[20];

   printf("Enter the first file name: ");
   gets(file1);

   printf("Enter the second file name: ");
   gets(file2);

   printf("Enter the file name where you want ot store: ");
   gets(file3);

   fp1 = fopen(file1, "r");
   fp2 = fopen(file2, "r");

   if (fp1 == NULL || fp2 == NULL)
   {
      perror("Error ");
      exit(0);
   }

   // Opening in write mode
   fp3 = fopen(file3, "w");

   if (fp3 == NULL)
   {
      perror("Error ");
      exit(0);
   }

   while ((ch = fgetc(fp1)) != EOF)
      fputc(ch, fp3);

   while ((ch = fgetc(fp2)) != EOF)
      fputc(ch, fp3);

   printf("\n%s and %s are merges to %s successfully.\n", file1, file2, file3);

   fclose(fp1);
   fclose(fp2);
   fclose(fp3);

   return 0;
}
```
Output:

Before and after the execution, all the files will look like following:

Before:
file1.txt:
Hello World!
file2.txt
This is simple2code.com.

After:
file3.txt
Hello World!
This is simple2code.com.

The above program to merge the content of two files in C is successfully tested in a machine.
9 September 2021
C Program to Append Data to a Text file
In this tutorial, we will write a C program to append data into a file. Before that, you may go through the following C topics.
- C file I/O
Appending data means adding an additional data at the end of the file such as:

test.txt: Hello!
New Data: This is simple2code.com

After appending the new data to the file, it will look something like this,
test.txt:
Hello!
This is simple2code.com

C Program to append data to a text file

Explanation: We will first open the file, if the file does not exist then the program will automatically create a file for you. Then the program will ask for the data to enter.

If there is some data already present in the file then the newly entered data will be added at the end of the file.
```
#include <stdio.h>
#include <stdlib.h>

int main()
{
   FILE * fp;
   char data[1000];

   fp = fopen("test.txt", "a");

   printf("Enter data to append: ");
   fgets(data, 1000, stdin);

   fputs(data, fp);

   printf("File appended successfully");
   fclose(fp);

   // Again open the file to display
   fp = fopen("test.txt", "r");

   printf("\nNew Content:\n");
   char ch;
   while ((ch = fgetc(fp)) != EOF)
   {
      printf("%c", ch);
   }

   fclose(fp);

   return 0;
}
```
Output: After the successful execution of the program for appending data into a file in C, we get,

Before and after the execution of the program, the data present in the test.txt:

Before:
Hello!

After:
Hello!
This is simple2code.com
9 September 2021
C Program to Copy Contents of one file to another
This is a file tutorial where we will write a program to copy the content from one file to another file in C. Before that, you may go through the following C topics.
- C file I/O
Before the program:

Before executing a program you need to create or have a file in the same directory as the source code. If the file from where the program needs to be copied does not exist then the program will show an error message.

So let us create a file with the name “test.txt” and has the following content in it.

Hi! Everyone…
This is simple2code.com

Copy content from one file to another in C program

The program will ask for two file names, one from where the content should be read and to where the content should be written.
```
#include <stdio.h>
#include <stdlib.h>

int main()
{
   FILE *fptr1, *fptr2;
   char filename[50], ch;

   printf("Enter the file name to be read: ");
   scanf("%s", filename);

   fptr1 = fopen(filename, "r");
   if (fptr1 == NULL)
   {
      printf("File does not exists!");
      exit(0);
   }

   printf("Enter the file name where to be copied: ");
   scanf("%s", filename);

   fptr2 = fopen(filename, "w");
   if (fptr2 == NULL)
   {
      printf("Cannot open file %s \n", filename);
      exit(0);
   }

   ch = fgetc(fptr1);
   while (ch != EOF)
   {
      fputc(ch, fptr2);
      ch = fgetc(fptr1);
   }

   printf("\nContent is copied to %s successfully.", filename);

   fclose(fptr1);
   fclose(fptr2);

   return 0;
}
```
Output:

Note: If the file to where the content should be copied is not created before the program then the program will automatically create that file for you.

After successful execution of the program, check the copy.txt file, you will find the same content present in the test.txt file.
8 September 2021
C Program to create a File & write Data in it
This is a file tutorial where we will write a C program to create a file and write into it. Before that, you may go through the following C topics.
- C file I/O
Explanation: The program is based on the file system in C. The program opens the file system in writing mode, hence the “w”. If the file is not present with the name provided then the program will create a file on the same directory.

The program will check if the file is Null or not. If not then, it will ask the user to enter data which later will be inserted into the file. Let us go through the program.

Program to write into a file in C
```
#include <stdio.h>
#include <conio.h>

void main()
{
   FILE * fptr;
   char data[100];

   fptr = fopen("test.txt", "w");

   if (fptr == NULL)
   {
      printf("Error occured!");
      return;
   }

   printf("Enter the data: \n");
   fgets(data, 100, stdin);

   fputs(data, fptr);	//writing to a file

   printf("\nFile created and saved successfully.");

   fclose(fptr);
}
```
Output:

After successful execution of the program, a file named “test.txt” will be created (if not already created) in the same directory where you have stored the source code file. Open that file and you will see the data that you wrote on the program will be present there in the following way.

This is simple2code.com
8 September 2021
C++ Program to Write Date into a File
In this tutorial, we will write a C++ program to write data into a file and store the information. In order to understand the program, you should have knowledge of the following topic in C++.
- C++ Files I/O
Explanation:

First, the program asks the user to enter the name of the file where they want to write. Then to write content into a file, you must first open the file in a write mode. Also, we will check if the file name entered by the user exists or not.

If it does not exist then the file with the name entered is automatically created inside the current directory. And finally, the program will ask the user to enter the String to store in the file.

C++ Program to Write Date into a File
```
#include <iostream>
#include <stdio.h>
#include <fstream>
using namespace std;

int main()
{
   string fname, str;
   fstream fp;

   cout << "Enter the file name: ";
   getline(cin, fname);

   fp.open(fname, fstream::out);

   if (!fp)
   {
      cout << "Error Occurred during execution!";
      return 0;
   }

   cout << "Enter the Data:\n";
   getline(cin, str);

   while (str.length() > 0)
   {
      fp << str;
      fp << "\n";
      getline(cin, str);
   }

   fp.close();
   cout << "Data written succefully.";

   return 0;
}
```
Output: Enter the data and press enter two times to exit the writing mode.

After successful execution of the program, you can check that the test.txt file present in the current directory will have the exact following string in it.

Hi! I am simple2code.com.
Learn Tutorials.
7 September 2021
C++ Program to Read a File
In this tutorial, we will write a C++ program to read a file and display its contents. In order to understand the program, you should have knowledge of the topic in C++ below.
- C++ Files I/O
Before writing a program: To read a file using C++ program, you first need to create a file and give it a name and save the file inside the current directory (i.e the directory where the C++ program will be saved).

Consider a text file name test.txt is saved which has the following content in it.

Hello! This is simple2code.com.

Now let us write a program to read this file in C++.

C++ Program to Read a File
```
#include <iostream>
#include <fstream>
#include <stdio.h>
using namespace std;

int main()
{
   ifstream file;
   char str[100], fname[100];

   cout << "Enter a file name: ";
   cin >> fname;

   file.open(fname);

   if (!file)
   {
      cout << "Error Occurred while opening file!";
      exit(0);
   }

   cout << "\n";

   while (file.eof() == 0)
   {
      file >> str;
      cout << str << " ";
   }

   file.close();

   return 0;

}
```
Output: After the execution, the following output will be displayed on the screen.
7 September 2021
C++ Program to Find Largest of Two Numbers
In this tutorial program, we will write a program to find the largest of two numbers in C++. We will discuss few ways to do so. We will check two ways:
1. Using if-else satement
2. Using conditional operator.
To understand the program better, you should have knowledge of the following topics in C++.
- C++ if else statement
- C++ operator
C++ Program to Find Largest of Two Numbers using if else statement

The program takes a user input for the two numbers which are to be checked. Then using if else statement, t simply checks through the condition which one is greater and prints the result of the largest one.
```
#include <iostream>
using namespace std;

int main()
{
   int num1, num2;

   cout << "Enter the 1st number: ";
   cin >> num1;
   cout << "Enter the 2nd number: ";
   cin >> num2;

   if (num1 > num2)
   {
      cout << num1 << " is the largest.";
   }
   else
   {
      cout << num2 << " is the largest.";
   }

   return 0;
}
```
Outputs:

Enter the 1st number: 25 Enter the 2nd number: 30 30 is the largest.

C++ Program to Find Largest of Two Numbers using conditional operator

It is the same as the above, the difference is that instead of is else statement, we use the conditional operator. It works the same as the if else statement and makes the code clean and in a single line.
```
#include <iostream>
using namespace std;

int main()
{
   int num1, num2, largest;

   cout << "Enter the 1st number: ";
   cin >> num1;
   cout << "Enter the 2nd number: ";
   cin >> num2;

   largest = (num1 > num2) ? num1 : num2;

   cout << largest << " is the largest of two.";

   return 0;
}
```
Outputs:

Enter the 1st number: 45 Enter the 2nd number: 13 45 is the largest of two.
7 September 2021
C++ Program to Print Multiplication Table of any Number
In this tutorial, we will write a C++ program to generate a multiplication table for any number and also for the given range.

In order to understand the program, you should go through the following topic in C++.
- C++ for loop
C++ Program to Print Multiplication Table of any Given Number

The program will print the table of the number entered by the user up to 10. The program uses for loop to iterate and print the number.
```
#include <iostream>
using namespace std;

int main()
{
    int n;

    cout << "Enter the number: ";
    cin >> n;

    for (int i = 1; i <= 10; ++i)
        cout << n << " * " << i << " = " << n*i << endl;
    
    return 0;
}
```
Output:

Enter the number: 4 4 * 1 = 4 4 * 2 = 8 4 * 3 = 12 4 * 4 = 16 4 * 5 = 20 4 * 6 = 24 4 * 7 = 28 4 * 8 = 32 4 * 9 = 36 4 * 10 = 40

C++ Program to Print Multiplication Table of any Number upto a given range

This program will work as same as the above, the extra feature added here is the range. The above program displays the table of any number up to 10 but here it will print the table up to the user’s choice.

The program takes user input for the number whose table needs to be displayed and also the range up to which number it should display.
```
#include <iostream>
using namespace std;

int main()
{
    int num, range;

    cout << "Enter the number: ";
    cin >> num;
    
    cout << "Enter range: ";
    cin >> range;

    for (int i = 1; i <= range; ++i)
        cout << num << " * " << i << " = " << num*i << endl;
    
    return 0;
}
```
Output:

Enter the number: 6 Enter range: 15 6 * 1 = 6 6 * 2 = 12 6 * 3 = 18 6 * 4 = 24 6 * 5 = 30 6 * 6 = 36 6 * 7 = 42 6 * 8 = 48 6 * 9 = 54 6 * 10 = 60 6 * 11 = 66 6 * 12 = 72 6 * 13 = 78 6 * 14 = 84 6 * 15 = 90
6 September 2021