Types of error

Errors are the problems or the faults that occur in the program, which makes the behavior of the program abnormal, and experienced developers can also make these faults. Programming malfunctions are also known as the bugs or faults, and the process of removing these bugs is known as debugging. There are 2 types of error, we'll study both in detail below

1. Compile time errors (syntax errors, Logical errors) - The error which occur even before compiling the program.
2. Run time errors - The errors which occur during execution of the program.

CODE

EG 1 . Assigning value to a variable without declaring

static void Main(string[] args) {
    age = 30; //Error
    Console.WriteLine(age);
}

CODE EXPLANATION
In the above code, we are assigning the value 30 to age. We haven't declared any variable called age but we assigning the value so system will show error stating The name 'age' does not exist in current context. If you try to compile above code system will pop out a error window. Just because this error is occuring even before compiling the program this is known as Compile time error.


EG 2 . Getting number from user

static void Main(string[] args) {
    Console.Write("Enter Number : ");
    int num = Convert.ToInt32(Console.ReadLine());
}

CODE EXPLANATION
If you compile above code, it will work completely fine because there is no compile time error. We going to get error if user enters a value other than integer number. Runtime errors occur during execution of the program. These are also called exceptions. This can be caused due to improper user inputs or improper design logic.