getchar  	read a character from STDIN
gets 		read a string from STDIN
scanf  		read formatted input from 
sprintf		write formatted output to a buffer
fread	  	read from a file
fgets  		get a string of characters from a stream
memcpy  	copies one buffer to another
memmove 	moves one buffer to another
memset		fills a buffer with a character
strcat 		concatenates two strings
strcpy		copies one string to another
strncat  	concatenates a certain amount of characters of two strings
strncpy  	copies a certain amount of characters from one string to another