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Swift program to create a constant

Here, we are going to learn how to create a constant in Swift programming language?
Last Updated : May 29, 2021

Swift - Create a constant

Here, we will create an integer constant using the let keyword. We can initialize the constant at the time of declaration. We cannot change the value of constant during the program.

Swift program to create a constant

The source code to create a constant is given below. The given program is compiled and executed successfully.

// Swift program to create a constant

let num:Int = 10;

// error: cannot assign to value: 'num' is a 'let' constant
// num = 20;

print("Num: ",num);

Output

Num:  10


...Program finished with exit code 0
Press ENTER to exit console.

Explanation

In the above program, we created an integer constant num using the let keyword initialized with 10. We cannot modify the value of created constant during the program, it will generate an error. Then we printed the value of num on the console screen.

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