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C++ is an object-oriented programming language that has broad use in today’s computing world. One particular problem that programmers occasionally encounter is how to input a variable in C++ without the user needing to hit the enter key. This task may seem simple, but it calls on far more than basic command line functions. Rather, it requires a deep understanding of event-driven programming and system-level coding that is often overlooked in conventional C++ guides.
When it comes to input without hitting enter, there are several libraries and methods we can use, but let me first introduce you to the most common approach which utilizes the conio.h library.
#include
#include
void main()
{
char var;
printf(“Enter a value: “);
var = getch();
printf(“nYou entered: %c”, var);
}
The conio.h Library
The header file conio.h is a C library used primarily in MS-DOS compilers to create text user interfaces. Functions like getch() and getche() come in handy when we desire to read a character directly from the console without the need for a buffer or hitting the enter key.
Understanding The getch() Function
The getch() function is a non-standard function that gets a character from the keyboard, does not echo to screen and does not require an enter to be pressed. Now let’s dissect the functionality of the code provided above.
The code begins with two #includes that initiate both conio.h and stdio.h. These are library files that contain predefined functions, like getch() and printf() which are used within the code. The main function is then defined, and this is where the bulk of our operations take place.
Opening our main function, we declare a variable of type char named var. Following this, we call the function printf() to prompt the user to enter a value.
Next, the getch() function is used. This function reads a single character from the keyboard immediately, without waiting for the enter key to be pressed. The captured character is then stored in our earlier declared variable, var.
Finally, another printf function is used to print out the character that the user input.
In conclusion, this demonstrates how C++ can offer a solution to almost any problem, even if it’s not immediately clear which tools should be used. However, this specific solution may not be ideal in a production environment due to the non-standard and system-specific nature of the conio.h library.
