# What Type of Data Is Returned by the IsNumeric Function?

//

Scott Campbell

What Type of Data Is Returned by the IsNumeric Function?

The IsNumeric function is a commonly used function in programming languages that allows you to determine whether a value is numeric or not. It is particularly useful when dealing with user input or when performing calculations that require numeric data.

## Understanding the IsNumeric Function

The IsNumeric function takes a value as input and returns a Boolean value indicating whether the input is numeric or not. If the input is numeric, the function returns true; otherwise, it returns false. This can be extremely helpful in validating user input and preventing errors in your code.

## Data Types Supported by IsNumeric

The IsNumeric function supports several data types. Let’s take a closer look at each:

### 1. Integer (int)

An integer is a whole number without any decimal places. The IsNumeric function recognizes integers and returns true.

### 2. Floating-Point Numbers (float)

Floating-point numbers are numbers with decimal places. The IsNumeric function treats floating-point numbers as numeric and returns true.

### 3. Scientific Notation (e.g., 1E10)

The IsNumeric function also recognizes scientific notation, which represents large or small numbers using exponentiation.

For example, “1E10” represents 1 followed by 10 zeros (i.e., 10 billion). The function considers scientific notation as numeric and returns true.

### 4. Negative Numbers

Negative numbers are also considered numeric by the IsNumeric function. Whether it’s an integer, floating-point number, or in scientific notation, if the value is negative, the function will return true.

### 5. Non-Numeric Values

If the input to the IsNumeric function is not numeric, it will return false. This includes values such as strings, dates, and booleans.

## Example Usage:

Let’s illustrate how the IsNumeric function can be used in a practical scenario:

• User Input Validation: When accepting user input for a numeric field (e., age or salary), you can use the IsNumeric function to ensure that only valid numeric values are accepted.
• Error Handling: When performing calculations or manipulating data that should be numeric, you can use the IsNumeric function to catch any potential errors caused by non-numeric values.
• Data Conversion: In some cases, you may need to convert non-numeric values into numeric ones. By using the IsNumeric function beforehand, you can ensure that only valid conversions are performed.

In conclusion, the IsNumeric function is a powerful tool in programming that allows you to determine whether a value is numeric or not. It supports various data types and returns a Boolean value indicating whether the input is numeric or not. By incorporating this function into your code, you can enhance user input validation, error handling, and data conversion processes.