C++ Program to Check Whether a Number is Integer or Not using While | For loop

C++ program to check whether a number is integer or not.

In this article, you will learn how to check whether a number is an integer or not using the for loop and while loop in the c++ programming language.

Example-1

Example-2

You should have knowledge of the following topics in c++ programming to understand these programs:

• C++ Strings
• C++ main() function
• C++ for loop statement
• C++ while loop statement
• C++ if-else condition statement
• C++ break keyword
• C++ cin object
• C++ cout object

C++ Program to Check Whether a Number is Integer or Not using While loop

// C++ Program to Check Whether a Number is Integer or Not using While loop
#include <iostream>
using namespace std;

int main() {
    char random_number[100];
    int f = 0, i = 0;

    cout << "Enter the number to check itself: ";
    cin >> random_number;

    while (random_number[i++] != '\0') {
        if (random_number[i] == '.') {
            f = 1;
            break;
        }
    }

    if (f)
        cout << endl << random_number << " is a floating-point number.\n";
    else
        cout << endl << random_number << " is an integer number.\n";
    return 0;
}

Run Program

Output

C++ Program to Check Whether a Number is Integer or Not using For loop

// C++ Program to Check Whether a Number is Integer or Not using For loop
#include <iostream>
using namespace std;

int main() {
    char random_number[100];
    int f = 0;

    cout << "Enter the number to check itself: ";
    cin >> random_number;

    for (int i = 0; random_number[i] != 0; i++) {
        if (random_number[i] == '.') {
            f = 1;
            break;
        }
    }

    if (f)
        cout << endl << random_number << " is a floating-point number.\n";
    else
        cout << endl << random_number << " is an integer number.\n";
    return 0;
}

Run Program

Output

Explanation

In this program, we have taken input 16 from the user and parsed this input as a string.

Meanwhile using for loop or while loop on this string we find the . symbol to verify It's an integer or floating-point number.