getchar in c with code examples

Introduction:

In C programming language, getchar() function is used to read a character from the standard input. The standard input is usually the keyboard, but it could also be a file or any other input device. This function reads one character at a time until you press the enter key.

getchar() Function Syntax:

The syntax for using getchar() function is as follows:

int getchar(void);

This function returns the character read as an integer. The integer value is the ASCII value of the character read.

Code Examples:

Let's look at some examples of using getchar() function in C programming language.

Example 1: Reading a single character from the standard input.

#include <stdio.h>

int main()
{
   int c;

   printf("Enter a character: ");
   c = getchar(); // reading a single character

   printf("You entered: ");
   putchar(c); // printing the character

   return 0;
}

Output:

Enter a character: A
You entered: A

In this example, we have used getchar() function to read a single character from the standard input. We have then used putchar() function to print the character.

Example 2: Reading multiple characters from the standard input using loop.

#include <stdio.h>

int main()
{
   int c;

   printf("Enter some characters: ");

   while((c=getchar()) != '
') // reading until enter key is pressed
   {
      putchar(c); // printing the character
   }

   return 0;
}

Output:

Enter some characters: Hello World!
Hello World!

In this example, we have used getchar() function in a loop to read multiple characters from the standard input until the enter key is pressed. We have then used putchar() function to print the characters.

Example 3: Reading characters from a file.

#include <stdio.h>

int main()
{
   FILE *fp;
   int c;

   fp = fopen("file.txt", "r"); // opening the file in read mode

   while((c=getchar()) != EOF) // reading until end of file
   {
      putchar(c); // printing the character
   }

   fclose(fp); // closing the file

   return 0;
}

In this example, we have used getchar() function to read characters from a file. We have opened the file in read mode using fopen() function. We have then used getchar() function in a loop to read characters from the file until the end of file is reached. We have then used putchar() function to print the characters.

Conclusion:

getchar() function is a commonly used function in C programming language. It is used to read a character from the standard input, which could be the keyboard, a file, or any other input device. This function is useful in many programs that require user input or reading from a file. It is important to note that getchar() function reads one character at a time until the enter key is pressed.

I'm sorry, which previous topic are you referring to? If you could please provide more context, I would be happy to provide additional information.

Popular questions

Sure, I'd be happy to provide some questions and answers about getchar() in C programming language.

  1. What is the return type of getchar() function in C programming language?

Answer: The return type of getchar() function is int.

  1. What is the purpose of getchar() function in C programming language?

Answer: The purpose of getchar() function is to read a single character from the standard input, which could be the keyboard or any other input device.

  1. How can getchar() function be used to read multiple characters from the standard input?

Answer: getchar() function can be used in a loop to read multiple characters from the standard input until the enter key is pressed. The loop can continue until getchar() function returns the newline character (i.e. '
').

  1. Can getchar() function be used to read characters from a file? If yes, how?

Answer: Yes, getchar() function can be used to read characters from a file. The file can be opened using fopen() function, and getchar() function can be used in a loop to read characters from the file until the end of file is reached.

  1. What is the ASCII value of the character read by getchar() function?

Answer: The ASCII value of the character read by getchar() function is returned as an integer. For example, if getchar() function reads the character 'A', its ASCII value (i.e. 65) will be returned as an integer.

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