C Language Learning notes-3. Sequential structure programming

I. Input and output of data

　　Functions included in the 1.stdio.h:

GetChar (input character) gets (input string) printf (format output) Putchar (output character)

Puts (output string) scanf (format input) Flushall (flush buffer), etc.

2.flushall (); Examples of functions:

scanf ("%c", &a);

Flushall (); Action: Remove "\ n" from the buffer to prevent it from being entered

scanf ("%c", &b);

3. Format characters

Octal	%o:55% #o: 055%d:45
Hexadecimal	%x:2d%x:2d% #X: 0X2D%d:45
Index	%e:1.5e+11%e:1.5e+11

Other format characters:%g,%g: Automatically select%e or%f based on size

Percent: output%

%.6D: Output 6 bits, less than 0 (if more than 6 bits are output as-is)

%.6S/.6C: Output 6 bits, padded with spaces

%.6F: Set the precision to 6 digits after the decimal point (rounded)

4.SCANF ("Format control string", address list);

If, in the format control string, there are other characters besides the format description, you must enter the same character at the appropriate location when entering

5.C language whitespace characters: ', ' \ t ', ' \ n '

If the format character is like "%d%f%d", then any number of whitespace characters can be inserted between each input data at the actual input.

If "%c" is used, each character is treated as valid data (including white space characters)

If a white space character appears in the format control string, the input white space character is read in without saving until the next item is encountered

C Language Learning notes-3. Sequential structure programming