C language scanf and printf output input problem

A line of code cannot print a variable of type int,float,double,char

the last char type variable cannot be printed, and setbuf (stdin,NULL)

is added.
C
Mar.07,2021
In

scanf, c reads a space, so it outputs a space

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e53c1e-66bfc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e53c1e-66bfc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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