Skip to content

Courses
Tutorials
Practice
Contests

C
C Basics
C Data Types
C Operators
C Input and Output
C Control Flow
C Functions
C Arrays
C Strings
C Pointers
C Preprocessors
C File Handling
C Programs
C Cheatsheet
C Interview Questions
C MCQ
C++

Program that allows integer input only

Program to find out the data type of user input

Last Updated : 26 Dec, 2017

Comments

Improve

Suggest changes

Like Article

Like

Report

Try it on GfG Practice

Take a input from user and find out the data type of input value.

Examples :

  Input : geek  Output : The input is a string    Input : chetna  Output : The input is a string    Input : 4  Output : The input is a integer

Below is C program to find the datatype of user input :

   // C program to find data type 
#include <math.h> 
#include <stdio.h> 
#include <stdlib.h> 
# define MAX_INPUT 100 
  
int main() 
{ 
    // To read input 
    char value[MAX_INPUT] = ""; 
  
    // To store numeric value of input if a  
    // number (float or integer) 
    double temp; 
  
    // To store integral value of input 
    int n; 
  
    // To store string value of input 
    char str[MAX_INPUT] = ""; 
  
    // Precision for integer checking 
    double val = 1e-12; 
  
    fgets(value, 100, stdin); // Read input 
  
    // Check for integers. 
    if (sscanf(value, "%lf", &temp) == 1)  
    { 
        n = (int)temp; // typecast to int. 
        if (fabs(temp - n) / temp > val)  
            printf("The input is a floating point\n");         
        else 
            printf("The input is an integer\n");         
    } 
  
    // Check for string  
    else if (sscanf(value, "%s", str) == 1)      
        printf("The input is a string\n"); 
      
    else // No match.     
        printf("input not recognized\n");     
} 
 
  

Output :

4  The input is an integer

Program that allows integer input only

C

chetna_chandra

Improve

Article Tags :

C Programs
C/C++ Puzzles
School Programming
C-Data Types

Similar Reads

C Program to Find the Size of int, float, double and char

Write a C program to find the size of the data types: int, float, double, and char in bytes and print it on the output screen. Examples Input: charOutput: Size of char: 1 byte Input: intOutput:Size of int: 4 bytes Different Methods to Find the Size of int, float, double and char in CWe can find the

How to Take Operator as Input in C?

In C, an operator is a symbol that tells the compiler to perform specific mathematical or logical manipulations. We may need to take operator as an input in some cases. In this article, we will learn how to take an operator as input in C. Get Input Operator in CTo take an operator as input in C, we

Program that allows integer input only

Given an input value N, the task is to allow taking only integer input from the user. Now, if the user enters any input other than an integer, that is, a character or symbol, it will not be accepted by the program. Below is the C program to implement this approach: [GFGTABS] C // C program for the a

C Program to Print the Program Name and All its Arguments

The command-line argument (CLA) is the parameter provided in the system upon request. Command-line conflict is an important concept in system C. It is widely used when one needs to control your system from the outside. Command-line arguments are transferred to the main () path. Argc calculates the n

Lex Program to accept a valid integer and float value

Lex is a computer program that generates lexical analyzers. Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language. The commands for executing the lex program are: lex abc.l (abc is the file name) cc lex.yy.c -efl ./a.ou

How to Take Multiple Input in C?

In C, we use scanf to take input from the user, and often it is necessary to take multiple inputs simultaneously. In this article, we will learn about how to take multiple inputs from the users in C. Multiple Inputs From a User in CTo take multiple inputs from users in C, we can declare an array to

C Program For Char to Int Conversion

Write a C program to convert the given numeric character to integer. Example: Input: '3'Output: 3Explanation: The character '3' is converted to the integer 3. Input: '9'Output: 9Explanation: The character '9' is converted to the integer 9. Different Methods to Convert the char to int in CThere are 3

How to Read Input Until EOF in C?

In C, reading input until the End of the File (EOF) involves reading input until it reaches the end i.e. end of file. In this article, we will learn various methods through which we can read inputs until EOF in C. Reading Input Until EOF Read Input Until EOF Using getchar()Read Input Until EOF Using

Program to check if a number belongs to a particular base or not

TiGiven a number N and its radix base R, find whether its valid or not according to its radix base. Find valid/invalid number for any base ranging from binary to base32. Examples: Input : 1000101010001 Output : Valid 1000101010001 is valid binary number. Input : 0xFFFAG Output : invalid 0xFFFAG is n

C Compound Data Types Practice Problems

Compound Data Types are those data types in C that are created using basic data types. They provide an interface to use the built-in data types is different ways to satisfy our requirement. They are frequently used to handle real world cases it is a must for programmers to have good clear understand

Corporate & Communications Address:

A-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305)

Registered Address:

K 061, Tower K, Gulshan Vivante Apartment, Sector 137, Noida, Gautam Buddh Nagar, Uttar Pradesh, 201305

Advertise with us

Company
About Us
Legal
Privacy Policy
In Media
Contact Us
Advertise with us
GFG Corporate Solution
Placement Training Program

Languages
Python
Java
C++
PHP
GoLang
SQL
R Language
Android Tutorial
Tutorials Archive

DSA
Data Structures
Algorithms
DSA for Beginners
Basic DSA Problems
DSA Roadmap
Top 100 DSA Interview Problems
DSA Roadmap by Sandeep Jain
All Cheat Sheets

Data Science & ML
Data Science With Python
Data Science For Beginner
Machine Learning
ML Maths
Data Visualisation
Pandas
NumPy
NLP
Deep Learning

Web Technologies
HTML
CSS
JavaScript
TypeScript
ReactJS
NextJS
Bootstrap
Web Design

Python Tutorial
Python Programming Examples
Python Projects
Python Tkinter
Python Web Scraping
OpenCV Tutorial
Python Interview Question
Django

Computer Science
Operating Systems
Computer Network
Database Management System
Software Engineering
Digital Logic Design
Engineering Maths
Software Development
Software Testing

DevOps
Git
Linux
AWS
Docker
Kubernetes
Azure
GCP
DevOps Roadmap

System Design
High Level Design
Low Level Design
UML Diagrams
Interview Guide
Design Patterns
OOAD
System Design Bootcamp
Interview Questions

Inteview Preparation
Competitive Programming
Top DS or Algo for CP
Company-Wise Recruitment Process
Company-Wise Preparation
Aptitude Preparation
Puzzles

School Subjects
Mathematics
Physics
Chemistry
Biology
Social Science
English Grammar
Commerce
World GK

GeeksforGeeks Videos
DSA
Python
Java
C++
Web Development
Data Science
CS Subjects

@GeeksforGeeks, Sanchhaya Education Private Limited, All rights reserved

We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy

Improvement

Suggest Changes

Help us improve. Share your suggestions to enhance the article. Contribute your expertise and make a difference in the GeeksforGeeks portal.

geeksforgeeks-suggest-icon

Create Improvement

Enhance the article with your expertise. Contribute to the GeeksforGeeks community and help create better learning resources for all.

geeksforgeeks-improvement-icon

Suggest Changes

min 4 words, max Words Limit:1000

Thank You!

Your suggestions are valuable to us.

What kind of Experience do you want to share?

Interview Experiences

Admission Experiences

Career Journeys

Work Experiences

Campus Experiences

Competitive Exam Experiences