C: Write a code for checking if a given input is an integer value or not.

 

Write a code for checking if a given input is an integer value or not.

 

Code

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#include <iostream>
using namespace std;
bool isNumeric(string str) {
   for (int i = 0; i < str.length(); i++)
      if (isdigit(str[i]) == false)
      return false; //when one non numeric value is found, return false
   return true;
}
int main() {
   string str;
   cout << "Enter a string: ";
   cin >> str;
   if (isNumeric(str))
      cout << "This is a Number" << endl;
   else
      cout << "This is not a number";
}

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Output

Enter a string: 5687 

This is a Number

Output

Enter a string: deve124

This is not a number