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1. Examples of scanf () and printf () functions # include int main () {char a [100]; printf ("Please enter:"); scanf ("% s", a); printf ("\ nYou entered:% s\ n", a); return 0;}

Running result

When a space is encountered, the input ends

2. Examples of getchar () and putchar () functions 1#include int main () {int a; printf ("Please enter:"); a = getchar (); printf ("\ nYou entered:"); putchar (a); printf ("\ n"); return 0;}

Running result

Instance 2int getchar (void)

Read a character from standard input and return type int to return EOF (- 1)

Windows- > Ctrl-Z

Unix- > Ctrl-D

Int putchar (int a)

Writing one character to standard output returns several characters written, and EOF (- 1) indicates write failure

# include int main () {int a; while ((a = getchar ())! = EOF) {putchar (a);} printf ("EOF\ n"); return 0;}

Running result

Third, gets () and puts () functions

The char * gets (char * s) function reads a line from stdin to the buffer pointed to by s, up to a Terminator or EOF.

The int puts (const char * s) function writes the string s and a trailing newline character to stdout.

Example # include int main () {char a [100]; printf ("Please enter:"); gets (a); printf ("\ nYou entered:"); puts (a); return 0;}

Running result

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