Page 11 - 6437

Floating-Point Types
The following table provides the details of standard floating-point types with storage sizes
and value ranges and their precision:

Type Storage size Value range Precision

float 4 byte 1.2E-38 to 3.4E+38 6 decimal places

double 8 byte 2.3E-308 to 1.7E+308 15 decimal places

long double 10 byte 3.4E-4932 to 1.1E+4932 19 decimal places

The header file float.h defines macros that allow you to use these values and other details
about the binary representation of real numbers in your programs. The following example prints
the storage space taken by a float type and its range values:

#include <stdio.h>

#include <float.h>

int main()
{

printf("Storage size for float : %d \n", sizeof(float));
printf("Minimum float positive value: %E\n", FLT_MIN );

printf("Maximum float positive value: %E\n", FLT_MAX );
printf("Precision value: %d\n", FLT_DIG );

return 0;

}
When you compile and execute the above program, it produces the following result on
Linux:

Storage size for float : 4
Minimum float positive value: 1.175494E-38

Maximum float positive value: 3.402823E+38
Precision value: 6