Meaning of Debugging

Debugging means the process of finding errors,  finding reasons for errors, and techniques of their fixation. An error,  also known as a  bug,  is a  programming code that prevents a program interpretation.

Errors are of three types –

• Compile Time Error
• Run Time Error
• Logical Error

Compile-time error :

These errors are basically of 2 types –
Syntax Error: Violation of formal rules of a programming language results in a syntax error.

For ex-
a=5
if a>10
SyntaxError: ‘:’ syntax error
Semantics Error: Semantics refers to the set of rules which sets the meaning of statements. A meaningless statement results in semantics error.
For ex-
x * y = z

Logical Error

If a program is not showing any compile-time error or run time error but not producing desired output, it may be possible that the program is having a logical error. These are not detected by the compiler or interpreter. These are hard to detect.
Some example-

• Use a variable without an initial value.
• Provide wrong parameters to a function.
• Use of the wrong operator in place of correct operator required for operation.

X=a+b (here – was required in place of + as per requirement

Run time Error

These errors are generated during a program execution due to resource limitations. Python is having the provision of checkpoints to handle these errors.

For ex-
a=10
b=int(input(“enter a number”))
c=a/b
Value of b to be entered at run time and the user may enter 0 at run time, that may cause run time error because any number can’t  be divided by 0

Run time Error in Python

In Python, try and except clauses are used to handle an exception/runtime  error  which  is  known  as  exception handling

try:
#  code with a probability of exception will be written here.
a=10
b=int(input(“enter a number”))
c=a/b
except:
#code to handle exception will be written here.
print(“divide by zero error”)

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