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Program to find out the data type of user input
  • Difficulty Level : Easy
  • Last Updated : 26 Dec, 2017

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");        
            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 :

The input is an integer

Want to learn from the best curated videos and practice problems, check out the C Foundation Course for Basic to Advanced C.

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