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C++ Program to check if input is an integer or a string
Given with an input by the user and the task is to check whether the given input is an integer or a string.
Integer can be any combination of digits between 0 -9 and string can be any combination excluding 0 – 9.
Example
Input-: 123 Output-: 123 is an integer Input-: Tutorials Point Output-: Tutorials Point is a string
Approach used below is as follows −
- Input the data.
- Apply isdigit() function that checks whether a given input is numeric character or not. This function takes single argument as an integer and also returns the value of type int.
- Print the resultant output.
Algorithm
Start Step 1->declare function to check if number or string bool check_number(string str) Loop For int i = 0 and i < str.length() and i++ If (isdigit(str[i]) == false) return false End End return true step 2->Int main() set string str = "sunidhi" IF (check_number(str)) Print " is an integer" End Else Print " is a string" End Set string str1 = "1234" IF (check_number(str1)) Print " is an integer" End Else Print " is a string" End Stop
Example
#include <iostream>
using namespace std;
//check if number or string
bool check_number(string str) {
for (int i = 0; i < str.length(); i++)
if (isdigit(str[i]) == false)
return false;
return true;
}
int main() {
string str = "sunidhi";
if (check_number(str))
cout<<str<< " is an integer"<<endl;
else
cout<<str<< " is a string"<<endl;
string str1 = "1234";
if (check_number(str1))
cout<<str1<< " is an integer";
else
cout<<str1<< " is a string";
}
Output
sunidhi is a string 1234 is an integer
Updated on: 02-Nov-2023
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