What the difference between single type and dynamic type?

Single type refers to a programming language that requires all variables and expressions to be declared with a specific data type at the time of compilation or declaration. Once the data type is set, it cannot be changed during runtime. Examples of single-type languages include C, C++, Java, and Swift. 

On the other hand, dynamic type refers to a programming language that does not require variables and expressions to be declared with a specific data type at the time of compilation or declaration. Instead, the data type is determined during runtime based on the value assigned to the variable or expression. Examples of dynamic-type languages include Python, Ruby, and JavaScript. 

In summary, the key difference between single-type and dynamic-type is that single-type languages require data types to be declared at the time of compilation or declaration, while dynamic-type languages determine the data type during runtime based on the value assigned to the variable or expression.

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