[embedded C foundation] Part 6: super detailed explanation of common input and output functions

stdio.h Standard I / O library

putchar Output a character... To the terminal
getchar Get a character from the terminal

printf Output the format string to the terminal
scanf Read the format string from the terminal

puts Output a string to the terminal
gets Read a string from the terminal

1 putchar

int putchar (int ch);
Parameters ：ch For the character to be output , The character is represented by its corresponding int Value for delivery .
Return value ： Output success , Returns the ASCII Code value , Otherwise return to EOF.
function : Output a character... To the terminal
characteristic :1. Characters are output to the terminal
2. Output a character

Example 1：

Execution results ：

Example 2：

#include <stdio.h>

int main