Introduction to printf() and Scanf() Functions

Aim: Addition of two values.

As mentioned in earlier post (Comments in C language), we'll see in this program about multi line comment.

In this program we'll do (Algorithm of program):

• take two values from user.
• Store that values in different Variables (here a and b are variable)
• Make equation to addition of that two values and store in respective variable (here Sum is variable)
• And finally print / show that value to user

Let's go to program for better understanding.

Program:

Output of program: Step by Step
(1) When you run program:

Due to printf Function output Screen will show "Enter Number A:" As per coding.

(2) Now type any number:

When type number "18" and press Enter Key, C compiler will save 18 value in variable "a" with the help of scanf function.

(3) Similarly:



(4) Finally got answer

Due to Equation: "Sum=a+b", Variable 'Sum' have value addition of variable a and b.
And output screen will show it as per coding.

printf( ) :

This function is used to print the “character, string, integer, float, octal and hexadecimal values” onto the output screen.
Use of printf() function with %d format specifier to display the value of an integer variable.
Similarly %f for float variable, %lf for double, %c is used to display character, %s for string variable, and %x for hexadecimal variable.
To generate a new line, “\n” in C printf() statement.

Scanf( ) :

This function is used to read "character, numeric data, string" from keyboard.
To get character value is assigned to the variable “ch”.
To get string value is assigned to the variable “str”.

We'll see variables in future posts step by step...

If you're not familiar with variable see detailed example of variable...

See Also:

What is Variable ? Explore variable with Example ...

What is Datatype ? Explore Datatype with Example ...