Input\output operations in c

Input è scanf() function

Output è printf() function

printf(): write in  “ “ what you want to display on console screen.

                Example: 1) printf(“Hello world”);

                                Output: Hello world

                Example: 2) when you want to print decimal value

                                int a=88;

                                printf(“result = %d”,a);

                                output: result = 88;

note: here   d   is specifier which is replaced by the value of   variable  a  outside the “ “ separated by the comma (,).

Type	Quality input
C	For single character
D	For decimal values
F	Floating point numbers
E, e	Floating point numbers in form of exponential format
G	Floating point number in the shorter of e format
O	For octal numbers
S	For a sequence of character (string)
U	Unsigned decimal values
X, X	Hexadecimal values

scanf() è same rules are applied for the input function scanf() as printf(); But the main difference is the “&” operator.

Example:   int rno;

                scanf(“%d”, &rno);

*) Here we have to write &rno instead of   rno .

*) The sign “ & “  means ‘address of’ .

Every variable has an address in the computer memory where we have to store the value  for that variable. So we use “ & “ sign.