How to Check If a Number is Integer in C | Check If Number is Integer C

How to check if a number is integer in C | check if number is integer C.

In this article, you will learn how to check if a number is integer in C | check if number is integer C.

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 printf() function

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 <stdio.h>

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

    printf("Enter the number to check itself: ");
    scanf("%s", random_number);

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

    if (f)
        printf("\n%s is a floating-point number.\n", random_number);
    else
        printf("\n%s is an integer number.\n", random_number);
    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 <stdio.h>

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

    printf("Enter the number to check itself: ");
    scanf("%s", random_number);

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

    if (f)
        printf("\n%s is a floating-point number.\n", random_number);
    else
        printf("\n%s is an integer number.\n", random_number);
    return 0;
}

Run Program

Output

Explanation

In this program, we have taken input 15 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.