Validating Data Entries

Suppose you have an application that reads input from the keyboard. How can you detect whether alphabetic data is being entered into an integer field from a cin statement?

The easiest way to validate the user’s input is by having cin read a string rather than a numeric data type such as int or float. After the user has entered the data, you should examine that string to detect its validity. For example:

 #include #include using namespace std;int main(){  bool error = false;  string data;  cout<<"enter your age: "; // users must enter an integer  cin>>data; // what if user enters a character by mistake?  for (unsigned i = 0; i< data.length(); i++) // validate  {    if ( ! isdigit(data[i]) ) // any non-numeric values?    {     cout<< "illegal input";     error = true;     break;    }  }  if ( ! error)  {    // .. valid data entered; continue normally  }}

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS