How many bytes is uint32
Before a variable can be used in the program, it must be declared. Data types are used to assign a type to a variable. It is important to know the size of the different data types in order to prevent variable overflows.
The value range of a data type can be calculated using the following formula:
Integer data types:
|Bits||sign||Range of values|
(2 or 4 bytes)
|int (2 or 4 bytes)||int32_t||32||Signed|
Depending on the platform, an int / unsigned int can be 2 or 4 bytes in size. To get the exact size of a type or variable on a particular platform, the sizeof Operator can be used. The expression sizeof (type) supplies the memory size of the object or type in bytes. Below is an example of the size of the int Type on every machine.
Floating point types
The following table shows the details of standard floating point types with memory sizes and value ranges and their precision.
|C types||Bits||Ranges of values||accuracy|
|float||32||1.2E-38 to 3.4E + 38||6 decimal places|
|double||64||2.3E-308 to 1.7E + 308||15 decimal places|
|long double||80||3.4E-4932 to 1.1E + 4932||19 decimal places|
The header file float.h defines macros with which these data types can be used, as well as querying information about the binary representation of real numbers. The following example prints the space occupied by a floating point type and its range of values.
The void data type
The void type indicates that no value is available.
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