Double,long double and array of variables memory overhead

IEEE754 the representation of floating-point numbers. The expression range of float type data in C language is -3.4*10^38~+3.4*10^38. Double is -1.7*10^-308~1.7*10^308,long double for -1.2*10^-4932~1.2*10^4932.

Type	Number of bits (bits)	Valid numbers	Range of values
Float	32	6~7	-3.4*10^38~+3.4*10^38
Double	64	15~16	-1.7*10^-308~1.7*10^308
Long double	128	18~19	-1.2*10^-4932~1.2*10^4932

Long double input: scanf ("%lf", &x); printf ("%.10LF", X);

In addition, the analysis of the use of memory consumption of arrays.

The int float is a 32-bit, or 4b=32bit

When you open an array of 10^7, the memory consumed is: 10^7*4B=39063KB=38MB

Short int is 16 bits, 10^7 array requires 19MB memory

Bool,char is a 8-bit, 10^7 array requires approximately 10MB of memory

Long long,double is 64 bits,10^7 array requires approximately 72MB of memory

A long double is 128 bits, and the10^7 array requires about 144MB of memory

Double,long double and array of variables memory overhead