Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære User Input | Variables
Introduction to C++

Sveip for å vise menyen

book
User Input

We already know how to output the data with the object cout and operator <<. However, sometimes we need to get values directly from the user. To enable this operation use cin in combination with the extraction operator >>.

python

For example, here we want to get the value for the variable a and output it:


              
123456789101112131415161718

            
01   #include <iostream>
 02   using namespace std;
 03   
 04   int main() {
 05       // Declare the variable
 06       int a;

 07       // Print the message for user to get the value
 08       cout << "Print a number: ";

 09       // Get user input
 10       cin >> a;

 11       // Display the input of the user
 12       cout << "Your number is: " << a;
 13 
 14       return 0;
 15   }
copy

In the line #9 the user print the value which will be stored in the variable a.

Oppgave

Swipe to start coding

Let’s write the simple code to output the age of the user.

  1. Declare the variable age type of int.
  2. Get the value from the user which will be stored in the variable age.
  3. Display the variable age.

Don’t forget about semicolon ; at the end of statements.

Løsning

Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 2. Kapittel 3

Spør AI

expand
ChatGPT

Spør om hva du vil, eller prøv ett av de foreslåtte spørsmålene for å starte chatten vår

book
User Input

We already know how to output the data with the object cout and operator <<. However, sometimes we need to get values directly from the user. To enable this operation use cin in combination with the extraction operator >>.

python

For example, here we want to get the value for the variable a and output it:


              
123456789101112131415161718

            
01   #include <iostream>
 02   using namespace std;
 03   
 04   int main() {
 05       // Declare the variable
 06       int a;

 07       // Print the message for user to get the value
 08       cout << "Print a number: ";

 09       // Get user input
 10       cin >> a;

 11       // Display the input of the user
 12       cout << "Your number is: " << a;
 13 
 14       return 0;
 15   }
copy

In the line #9 the user print the value which will be stored in the variable a.

Oppgave

Swipe to start coding

Let’s write the simple code to output the age of the user.

  1. Declare the variable age type of int.
  2. Get the value from the user which will be stored in the variable age.
  3. Display the variable age.

Don’t forget about semicolon ; at the end of statements.

Løsning

Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 2. Kapittel 3
Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Vi beklager at noe gikk galt. Hva skjedde?
some-alt