What is getch() in C

by Online Tutorials Library July 14, 2022

What is getch() in C?

The getch() is a predefined non-standard function that is defined in conio.h header file. It is mostly used by the Dev C/C++, MS- DOS’s compilers like Turbo C to hold the screen until the user passes a single value to exit from the console screen. It can also be used to read a single byte character or string from the keyboard and then print. It does not hold any parameters. It has no buffer area to store the input character in a program.

Why we use a getch() function?

We use a getch() function in a C/ C++ program to hold the output screen for some time until the user passes a key from the keyboard to exit the console screen. Using getch() function, we can hide the input character provided by the users in the ATM PIN, password, etc.

Syntax:

Parameters: The getch() function does not accept any parameter from the user.

Return value: It returns the ASCII value of the key pressed by the user as an input.

Write a simple program to display the character entered by the user using the getch() function in C.

Program.c

  #include    #include    int main()  {         printf(” Passed value by the User is: %c”, getch()); // print a character entered by the user  return 0;  }  

Output:

Passed value by the User is: P

To print any character on the console, press the corresponding key.

Write a simple program to hold the console screen until the user gives a key to exit.

Program2.c

  #include   #include    int main()  {     printf(“Enter a key to exit the console screen.n”);     getch();      return 0;  }  

Output:

Enter a key to exit the console screen.

Write a program to use the getch() function to accept the string from the user.

Usergetch.c

  #include    #include    int main() {          char ch[6] = {0}; int x;      for ( x = 0; x < 5; x++) {          ch[x] = getch(); // getch() function to take input      }      printf(“Received 5 character Input: %sn”, ch);      return 0;  }  

Output:

Received 5 character Input: hello

Write a program to use the getch() function to accept the hidden password from the user.

Program3.c

  #include  #include  #include  #include  void main()  {  char pw[10];  int x;  printf(” Enter password: “);  for (x = 0; x < 10; x++)  {  // accepts the hidden password using the getch() function  pw[x] = getch();  printf(“*”); // print the input chartered in the form of *  }  pw[x] = ‘

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