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to feed some data into a program
to display some data on screen, printer, or in any file
eads the next available character from the screen and returns it as an integer
int putchar(int c)
puts the passed character on the screen and returns the same character.
char *gets(char *s)
reads a line from stdin into the buffer pointed to by s until either a terminating newline or EOF (End of File).
int puts(const char *s)
writes the string 's' and 'a' trailing newline to stdout.
int scanf(const char *format, ...)
reads the input from the standard input stream stdin and scans that input according to the format provided.
int printf(const char *format, ...)
writes the output to the standard output stream stdout and produces the output according to the format provided.