C++ isblank() function:
isblank() function is used to check if a character is blank or not. It is defined in cctype header.
In this post, we will learn how isblank() works with examples.
Definition of isblank:
isblank function checks for a white-space character. A white-space character can be :
- ’ ’ or space
- ‘\t’ or horizontal tab
- ‘\v’ or vertical tab
- ‘\n’ or newline
- ‘\f’ or feed
- ‘\r’ or carriage return
It is defined in
int isblank(int c);It takes the character to check c as the parameter, casted to an integer. It returns an integer value. If it is non-zero, it is a blank character, i.e. true. Else, it returns 0.
Example:
Let’s try to use isblank to count the number of blank spaces in a string. For example:
#include <iostream>
#include <cctype>
using namespace std;
int main()
{
char str[100];
int count = 0;
int i = 0;
cout << "Enter a string :" << endl;
cin.get(str, 100);
do
{
if (isspace(str[i]))
{
count++;
}
i++;
} while (str[i] != '\0');
cout << "Total number of blank found : " << count << endl;
}Here,
- We are calculating the total number of blanks in a user given string.
- str is used to store the user input string.
- isspace is used to check if a character is blank or not. If yes, we are incrementing the value of count.
- Finally, it is printing the value of count i.e. total blanks found.
It will print output as like below:
Enter a string :
hello world !!
Total number of blank found : 2