The document discusses input/output functions in C programming. It describes the scanf() function for input, which reads data from variables using format specifiers in a control string. It also describes printf() for output, which prints values to the screen using format specifiers. Additional functions getchar() and putchar() are discussed for reading and writing single characters respectively.

1. Input output statement
C
S.Muthuganesh M.Sc.,B.Ed

2. scanf
• Usually input statement is used in C is scanf()
Syntax
• scanf (“control string”, &v1,&v2,&v3,…&vn);
• The control string must be a text enclosed in double quotes.
• It contains the data format of data being received.
• The ampersand & before each variable is an operator that specified the variable’s
names address and connecting it into internal representation in memory.
• Example for control string : integer (%d) , float (%f) , character (%c) or string (%s).

3. Printf()
•printf() function is used to print the “character, string, float, integer, octal and
hexadecimal values” onto the output screen.
•We use printf() function with %d , %f, %s forrmat specifier to display the value of
an variable.
•To generate a newline,we use “n” in printf() statement.
Syntax
printf (“outputstring identifiers(like %s,%d)”, variablenames);
Example
• printf(“hai hello%s”,name);

4. getchar()
• getchar is a function in C programming language that reads a single character.
getchar() function is used to get/read a character from keyboard input. When this
statement encountered the computer waits until key is pressed.
Syntax
Variable_name=getchar();
• Example
char name;
name = getchar();

5. putchar()
• putchar() function in C programming language which is used to write a character
on standard output/screen.
Syntax
putchar(variablename);
• Example
Choice=’y’;
putchar(Choice);

6. Thank you