The header file <stdio.h> defines a number of functions to format and output values. The format-control directives that for the formatted input and output function are described in Formatted input control strings and Formatted output control strings.
| Character and string I/O functions | |
| getchar | Read a character from standard input |
| gets | Read a string from standard input |
| putchar | Write a character to standard output |
| puts | Write a string to standard output |
| Formatted input functions | |
| scanf | Read formatted text from standard input |
| sscanf | Read formatted text from a string |
| vscanf | Read formatted text from standard input using a va_list argument |
| vsscanf | Read formatted text from a string using a va_list argument |
| Formatted output functions | |
| printf | Write formatted text to standard output |
| snprintf | Write formatted text to a string with truncation |
| sprintf | Write formatted text to a string |
| vprintf | Write formatted text to standard output using a va_list argument |
| vsnprintf | Write formatted text to a string with truncation using a va_list argument |
| vsprintf | Write formatted text to a string using a va_list argument |