Write short notes On Compilation and execution Operator precedence and associativity

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Write short notes On  Compilation and execution Operator precedence and associativity

Suresh Chand · Accepted Answer

1. Compiling and Execution:The compilation and execution process of C can be divided in to multiple steps:Preprocessing - Using a Preprocessor program to convert C source code in expanded source code. '#includes' and '#defines' statements will be processed and replaced actually source codes in this step.Compilation - Using a Compiler program to convert C expanded source to assembly source code.Assembly - Using a Assembler program to convert assembly source code to object code.Linking - Using a Linker program to convert object code to executable code. Multiple units of object codes are linked to together in this step.Loading - Using a Loader program to load the executable code into CPU for execution.2. Operator precedence and associativityOperator precedence describes the way in which the operations are evaluated. When we have several operations in an expression, each part is evaluated and resolved in a predetermined order decided by the operator precedence.Operators having higher precedence are solved first as compared to the lower precedence operators.For example:5+3*7 // it gives 26This is so because the multiplication operator ('*') has higher precedence over the addition operator ('+'), thus the expression 3 * 7 will solved first and the result of it (i.e. 21) becomes the right operand for the addition and then the addition is performed as 5 + 21 which returns 26.Associativity defines the way in which the operators having same precedence are evaluated.For example:10*5/2 // it gives 25('*') and ('/') have same precedence and 'left to right' associativity therefore 10*5 evaluated first, then its result (50) becomes the second operand for ('/') and after that 50/2 is evaluated which gives 25.

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Compilation and execution

Operator precedence and associativity

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Write short notes On Compilation and execution Operator precedence and associativity

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Write short notes On

Compilation and execution

Operator precedence and associativity