How to clear input buffer in c++(use of cin.ignore() function)

A temporary storage area is called a buffer. Sometimes we need to clear the unwanted buffer, so when the next input is taken, it stores into the desired container, but not in the buffer of the previous variable.

Let's see the following example

we take a number and a character array as input through the keyboard and print it on the screen as output. 

In this example, we have entered a number and a string but when the program run then we get only a number as the output.

This is because off after entering a number into the cin statement, we need to input a character array or string. So we need to clear the input buffer, otherwise, it will occupy the buffer of the previous variable.

To resolve this issue we need cin.ignore()
function. After taking first input it will clear the buffer and it will take second input.

The syntax of cin.ignore() function is given below

cin.ignore(numeric_limits<streamsize>::max(),'\n');

In the following program we have used cin.ignore() function to clear the input buffer :-