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Introduction to C++
Introduction to C++
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:
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 }
In the line #9 the user print the value which will be stored in the variable a.
Swipe to start coding
Let’s write the simple code to output the age of the user.
- Declare the variable
agetype ofint. - Get the value from the user which will be stored in the variable
age. - Display the variable
age.
Don’t forget about semicolon ; at the end of statements.
Løsning
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående mulighederTak for dine kommentarer!
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:
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 }
In the line #9 the user print the value which will be stored in the variable a.
Swipe to start coding
Let’s write the simple code to output the age of the user.
- Declare the variable
agetype ofint. - Get the value from the user which will be stored in the variable
age. - Display the variable
age.
Don’t forget about semicolon ; at the end of statements.
Løsning
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående mulighederTak for dine kommentarer!
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder