C language float type has several significant digits after the decimal point

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C language float type how many significant digits are there after the decimal point?

The valid digits after the decimal point of the float type are 6-7 digits.

The floating point type in C language is generally divided into float single precision type, double double precision type and long double long precision type. The effective digits after the single precision floating point and double precision floating point are 67.7 digits and 1516digits respectively. Single precision is 32 bits, double precision is 64 bits, and 8 bits is one byte.

The number of significant digits after the floating point is defined in the C language standard library header file float.h:

/ / part of the code of the float. H header file # define DBL_DIG 15 / / 15 places after the double precision decimal point # define FLT_DIG 6 / / 6 places after the single precision decimal point # define LDBL_DIG 19 / / long double precision decimal point 19

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