What are the input and output statements in C language?

The input and output statements of C language include: "getchar(void);" and "putchar(int c);", "scanf("format control string", address list);" and "printf( "Format control string ", output list);", "gets()" and "puts()" and so on.

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1: Console input Output

(1) Input/output of character data

Character outputputchar(int c);

Character input getchar(void);

(2) Formatted input/output

Format outputprintf("Format control string", output list);

Format inputscanf("Format control string", address list);

(3) String input/output

String outputputs(const char *str);

String inputgets(char *str);

scanf cannot accept spaces, Tab, carriage return, etc.; processing of the carriage return character at the end: keep the carriage return character in the cache.

gets can accept spaces, tab characters, carriage returns, etc.; the processing of the carriage return character at the end: accept the carriage return, but replace the carriage return with \0.

2: Reading and writing files

(1) Read and write a character

Character writing functionfputc (c,fp);

Character reading functionfgetc(fp);

(2)Block reading and writing

Binary writing function fwrite(buffer,size,count,fp);

Binary read functionfread(buffer,size,count,fp);

Format Formatted writing function fprintf (file pointer, format string, output item list);

Formatted reading function fscanf (file pointer, format string, address parameter list) ;

(3) Other reading and writing functions

Disk file writing functionputw(10,fp);

Disk file reading function getw(fp);

File string writing functionfputs(string, file pointer);

File string reading functionfgets (string array name, n, file pointer);

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