C programming

Declaring Variable as Constant

In C, you can declare a variable as a constant using the const keyword. Once a variable is declared as const, its value cannot be changed throughout the program. Here's an example:

                    #include <stdio.h>

                        int main() {
                            const int num = 5;  // Declare num as a constant integer with the value 5
                            // num = 10;  // This would cause a compiler error because num is a constant
                            
                            printf("The value of num is: %d\n", num);
                            
                            return 0;
                        }

In this example, num is declared as a constant integer with the value 5. If you try to change the value of num later in the program (e.g., num = 10;), the compiler will generate an error because num is declared as a constant.

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Q1. 1. What is the primary advantage of declaring variables as constants in C?

A It saves memory

B It improves program speed

C It prevents accidental modification

D It allows the variable to be used in any scope

Q2. How is a constant variable declared in C?

A const var_type variable_name = value;

B constant var_type variable_name = value;

C var_type constant variable_name = value;

D var_type variable_name const = value;

Getting Started With C

Declaring Variable as Constant

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