C language input/output format and additional format specifiers printf (), scanf ()

Printf (), scanf ()

% C --------------- output a character

% D ----------------- output a signed decimal integer

% E (% E) ------------ output a real number of floating-point numbers in the form of normalized exponent. Only 6 digits are valid.

Number, which includes one integer and five decimal places. The exponent part is connected to three digits in total)

% F (% F) ------------- outputs a floating point number. The default format will display 6 decimal places. For float type, valid numbers

Only the first 7 digits, double type, valid digits only the first 16 digits)

Eg: f = 1234567.1230; printf ("% f", & f); only the first seven digits of f = 1234567. xxxx are displayed, and the last digits are random.

% G (% G) ----------- output a floating point number, which can only display the first six valid values

% I ----------------- output a signed decimal integer

% O ---------------- output an octal unsigned integer must be positive or 0)

% P ---------------- output a pointer, that is, an address. The output value must be a pointer or address value)

% X (or % X) --------- output a hexadecimal unsigned integer must be positive or 0)

% S ----------------- output a string

% U ---------------- output an unsigned decimal integer

Additional format specifiers:

Space -------------- when the output value is positive, add a space before it. When the value is negative, add a negative number.

-****************** Align the output results left.

+ ****************** Add a symbol + or-to the output result -)

# **************** If the format is c, d, s, u, the output result is not affected.

* ************** If the format character is g, the decimal point is displayed only when the result contains decimal places.

* **************** If the format character is o, the o will be added before the output result

* *************** If the format character is x, the Ox will be added before the output result

The result of h **************** is output according to the short integer quantity.

L ****************** results will be output according to the Length Integer

Scanf () is used in the same format.

Different:

% [] ---------------- Scan Character Set combination during Input

M ----------------- specifies the width of the input data. m can only be a positive integer.

* ------------------ Indicates that the input will not be assigned to the corresponding variable.

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