This will explain Programming Errors or Bugs with debugging as well error types like syntax errors, Run-time errors and Logical errors in C Language

1. Programming Errors/ Bugs
 Bug
 Debugging
 Types of Programming Errors / Bugs
 Syntax Errors
 Run-time Errors
 Logical Errors
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2. Unexpected output produced by program.
Debugging
The process of finding and removing errors.
(Found by Developer) (Found by tester)
Error Bug
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3. Types of Errors/ Bugs
Invalid
statement
written in code
Error in
execution of
successful
compilation of
code
Poor logics in
Code
Syntax
errors
Syntax
errors
Run
Time
errors
Logical
errors
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4. Syntax of Programming Language
 Set of rules of a programming language for writing
statements of a computer program.
Syntax Errors:
 Occur due to violation of Syntax
(Grammar Rules) of programming language
 Detected before compile time
 Easy to detect and modify
 Program does not execute before correction
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5. Common Syntax Errors
Most frequently occurring syntax errors include:
 Missing or misplaced Semicolon “;”
 Spelling Mistake
 Missing or extra parenthesis or braces
 Incorrect use of operators, loops or blocks etc
#include<stdio.h>
int main()
{
int length = 5;
int width = 10 Missing Semicolon “;”
int area = length * width + ;
printtf(“Test”);
printf("The area of the rectangle is %dn", area);
return 0;
}
}
Spelling
mistake
Extra brace
Incorrect use of operator
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a6HMQ

6. RUN TIME ERROR
 Occur due to performing illegal operations (Divide a
number by zero)
 Occur during program execution (Run time).
 These errors are not hardest to find
 It leads to abnormal termination of the program
 When run time errors occur, the compiler stops the
execution of program and displays error message
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7. Common Run-Time errors
 Dividing a number by zero.
 If input data given to program is not in correct format
or input data file is not found in specified path
#include<stdio.h>
int main()
{
int no = 9, div =0; //Error: number is divided by zero 0,
div = no/0;
printf("The result is %dn", div);
return 0;
}
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8. Logical Errors
 The errors in logic of program are called logical errors.
 These errors are not detected by compiler
 These errors are hardest to find and remove because
 Compiler does not detect these errors
 There is not identification (error message) during
program execution.
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9. Common Logical Errors
Write a program in c language to show the sum of two numbers.
#include<stdio.h>
int main()
{
int a,b,sum;
sum = a-b;
printf("The sum of a and b is %dn", sum);
return 0;
}
This program always produce wrong result because
requirement is sum not subtraction
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