The meaning of %d,%s,%x,%f,%.100 in C language

The character format description of C language consists of "%" and format characters, such as %d%f, etc. Its function is to convert the output data into the specified format for output. Format descriptions always begin with the "%" character.

Format characters include d, o, x, u, c, s, f, e, g, etc., such as:

%d integer output, %ld long integer output,

%o output integer in octal form,

%x outputs an integer in hexadecimal form, or the address of a string.

%u outputs unsigned data (unsigned number) in decimal form. Note: %d and %u have unsigned numerical ranges, which are the limit values, otherwise the printed values ​​will be incorrect.

%c is used to output a character,

%s is used to output a string,

%f is used to output real numbers in decimal form, with 6 decimal places retained by default.

%.100f is used to output real numbers, retains 100 decimal places.

%e outputs real numbers in exponential form,

%g automatically selects f format or e format according to the size, and does not output meaningless numbers. zero.

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