{"id":13191,"date":"2022-12-13T14:24:59","date_gmt":"2022-12-13T08:54:59","guid":{"rendered":"https:\/\/fastbitlab.com\/?p=13191"},"modified":"2023-08-22T12:55:38","modified_gmt":"2023-08-22T07:25:38","slug":"microcontroller-embedded-c-programming-lecture-138-volatile-and-effect-of-optimization","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/microcontroller-embedded-c-programming-lecture-138-volatile-and-effect-of-optimization\/","title":{"rendered":"Microcontroller Embedded C Programming Lecture 138| volatile and effect of optimization"},"content":{"rendered":"
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volatile and effect of optimization<\/strong><\/span><\/h1>\n
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Type Qualifiers in C<\/b><\/span><\/h2>\n

In C programming, type qualifiers are used to specify the type and memory location of a variable. The following are the type qualifiers in C:<\/span><\/p>\n

1. const: <\/strong><\/span><\/span>specifies that the value of a variable cannot be modified.<\/span><\/p>\n

const<\/span> int<\/span> x = <\/span>20<\/span>; \/\/ x is a constant integer with a value of 20 <\/span><\/span><\/span><\/p>\n

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2. volatile:<\/strong> <\/span><\/span>specifies that the value of a variable can change unexpectedly, and prevents the compiler from optimizing its access.<\/span><\/p>\n

volatile<\/span> int<\/span> y = <\/span>30<\/span>; \/\/ y is a volatile integer with a value of 30<\/span><\/span><\/p>\n

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Volatile<\/b><\/span><\/h2>\n

Let’s understand the next type qualifier, which is ‘volatile’. <\/span><\/p>\n

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volatile is a type qualifier in ‘C’ used with variables to instruct the compiler not to invoke any optimization on the variable operation<\/strong>.<\/span><\/p>\n<\/blockquote>\n

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What is a variable operation?<\/span> <\/strong><\/p>\n

Variable operation is either read or write. <\/span><\/p>\n