String Manipulation function

strcat          appands one string to another

strchr          finds first occurence of a given character in string

strcmp       compares two strings

strcmpi      compares two strings without regard to case

strcpy         copies one string to another

strdup         duplicates a string

stricmp       compares two strings without regard to case

strlen           Finds length of a string

strlwr           coverts a string to lower case

strncat         Appends a portion of one string to another

strncmp      Compares a portion of one string with portion of another string

strncpy        copies a given number of characters of one string to another

strnicmp     compares a potion of one string with a portion of another without regard to case

strrchr         finds last occurence of a given character of a string

strrev           reverses a string

strset          sets all characters in a string to a given number

strstr           Finds first occurence of a given string in another string

strupr          converts a string to upper case

I/O Funcions

Close            closes a file

fclose            Closes a file

feof                detects end-of-file

fgetc              reads a character from a file

fgetchar        reads a character from keyboard

fgets             reads a string from a file

fopen           Opens a file

fprintf            Writes a formated display to a file

fputc             writes a character to a file

fputchar       writes a character to screen

fputs             writes a string to a file

fscanf           reads formatted data from a file

fseek            repositions file pointers to a given location

ftell                gets current file pointer position

getc               reads a character from a file

getch            reads  a chracter from a keyboard

getche          reads a character from keyboard and echoes it

getchar         reads a charcter from keyboard

gets               reads a line from keyboard

inport            reads a two-byte word from a specified port

inportb          reads one byte from the specified I/O port

kbhit              checks for a keystroke at a keyboard

lseek             repositions file pointers to a given location

open             opens a file

outport          writes a two-byte to the specific I/O port

outportb        writes one-byte word to the specific I/O port

printf              Writes formatted data to the screen

putc               Writes a character the file

putch           writes a character to the screen

putchar         writes a character to screen

puts              writes a line to file

read              reads data from file

rewind           repositions file pointer to beginning of a file

scanf             reads formatted data from keyboard

sscanf          reads formatted input froma string

sprintf            writes formatted output to  a string

tell                  gets current file pointer position

write               writes data to a file

Directory control functions

chdir                    changes current working directory

getcwd                 gets current working directory

fnsplit                    splits a full path name into its components

findfirst                 searches a sisk directory

findnext                  continues findfirst search

mkdir                     makes a new directory

rmdir                      removes a directory