Errors in C

Errors (also known as bugs) are common while writing a program. The errors should be detected and removed, or else, the whole set of statements of a program will simply produce wrong result. Errors can be detected only while running the program.

In C errors are of 3 types - Syntax Error , Logical Error and Run-time Error .

• Syntax Error : These are generally typing error of the statements that are not according to the grammatical rules or syntax of the language. 

• Syntax error will definitely occur and the program will not compile if semicolon (separator) is not placed at the end of the statement.

• Logical Error : It occurs due to entering logically incorrect statement in the program.

• If an addition program is instructed to do subtraction, it will compile, but produce a wrong output. This is logical Error.

• Run - time Error : A program free of syntax and logical errors, may not produce result due to run - time errors, which usually occur due to the following reasons : 

• Statements instructing to divide a number by zero.
• Statements instructing to find logarithm of a negative number. 
• Statements instructing to find the square root of a negative number. 

Logic Building - Examples

Let's Discuss some Examples.

1. Display the value of a variable :
Pseudocode in English :

• Declare a variable.
• Take the input.
• Display the variable.

Flowchart : 

• Declare three numeric variable.
• Take the inputs from user.
• Perform the sum.
• Display the result.

Flowchat :

See here check is intentionally skipped.

• Here int is data type in C , it stands for Integers. ( It will be discussed later in greater detail )