Typed Language: Typed languages are the languages in which we define the type of data type and it will be known by machine at the compile-time or at runtime.
Typed languages can be classified into two categories:
- Statically typed languages
- Dynamically typed languages
Statically typed languages: Statically typed languages are the languages like C, C++, Java, etc, In this type of language the data type of a variable is known at the compile time which means the programmer has to specify the data type of a variable at the time of its declaration. We have to pre-define the return type of function as well as the type of variable it is taking or accepting for further evaluations.
Syntax:
data_type variable_name;
Example: The below example illustrates the C++ code to show it is statically typed language:
C++
#include <iostream> #include <string> using namespace std; int number(int n){ return n; } int main() { // Here every variable is defined by // specifying data type to it string str = "neveropen"; int num = 109; float flo = 12.99; cout << "I'm a string with value: " << str; cout << "I'm a number with value: " << number(num); cout << "I'm a floating point number with value: " << flo; return 0; } |
Output:
I'm a string with value: neveropen I'm a number with value: 109 I'm a floating point number with value: 12.99
Example 2:
C++
#include <iostream> #include <string> using namespace std; int main() { // Here every variable is defined // by specifying data type to it string str="neveropen"; int num = 109; float flo = 12.99; int num2 = "Welcome to GeekdforGeeks"; cout << "I'm a string with value: " << str; cout << "I'm a number with value: " << num; cout << "I'm a floating point number with value: " << flo; cout << "I'm a number with value: " << num2; return 0; } |
Output: It will show an error because we can not directly assign the value to a variable other than its defined data type:
prog.cpp: In function ‘int main()’:
prog.cpp:11:13: error: invalid conversion from ‘const char*’ to ‘int’ [-fpermissive]
int num2="Welcome to GeekdforGeeks";
^
Dynamically typed language: These are the languages that do not require any pre-defined data type for any variable as it is interpreted at runtime by the machine itself. In these languages, interpreters assign the data type to a variable at runtime depending on its value. We don’t even need to specify the type of variable that a function is returning or accepting in these languages. JavaScript, Python, Ruby, Perl, etc are examples of dynamically typed languages.
Example: This example demonstrates JavaScript as a dynamically typed language:
HTML
<script> var str = "neveropen"; var num = 5; var flo = 12.99; var num2 = "Welcome to GFG"; function number(n) { return n; } console.log("I'm a string with value: " + str); console.log("I'm a number with value: " + number(num)); console.log("I'm a floating point number with value: " + flo); console.log("I'm a string with value: " + num2); </script> |
Output:
