Python program to convert int to exponential

Exponential notation also known as scientific notation, is a way to express numbers that are very large or very small using a combination of a coefficient and an exponent. It is commonly used in scientific and mathematical calculations.

In exponential notation, a number is expressed as the product of a coefficient and a power of 10. The coefficient is typically a decimal number between 1 and 10, and the power of 10 indicates the scale of the number.

For example −

• The number 1,000,000 can be expressed as 1 x 10^6 or 1e+6 in exponential notation.

• The number 0.000001 can be expressed as 1 x 10^-6 or 1e-6 in exponential notation.

On the other hand, the int data type is used to represent integers, which are whole numbers without decimal points. Integers are used to store numerical values that do not have fractional or decimal components.

The process of converting an int to exponential can be achieved using various approaches in Python, such as using the format() function, f-string formatting, or the str.format() method. These methods allow us to format an integer number in scientific notation by specifying the appropriate format specifier, such as 'e'.

Input Output Scenarios

Let's go through some input-output scenarios to understand the process of converting an integer to exponential notation.

Input: number = 987654321
Output: 9.876543e+08

Here, the integer 987654321 is converted to exponential notation as 9.876543e+08. The coefficient 9.876543 represents the number, and e+08 indicates that the decimal point is shifted eight places to the right.

Input: number = 362832
Output: 3.63e+05

In this scenario, the integer 362832 is converted to exponential notation as 3.63e+05. The coefficient 3.63 represents the number, and e+05 indicates that the decimal point is shifted five places to the right.

Below, we will discuss a few approaches to convert an int to exponential using Python programming.

Using the format() function

In this approach, we will be using the format() function with the "{:.2e}" format specifier. The specifier formats the number in exponential notation with two decimal places.

Example

Here's an example using the format function in Python to convert an integer to exponential notation.

#define a function
def int_to_exponential(num):
    return "{:.2e}".format(number)

number = 1000000
print('Input integer number:',number)
exponential = int_to_exponential(number)

# display the output exponential number 
print('Output exponential number:',exponential)

Output

Input integer number: 1000000
Output exponential number: 1.00e+06

Using the f-string formatting

F-strings, also known as "formatted string literals," are a type of string literals in Python. They are denoted by placing an 'f' at the beginning of the string and enclosing expressions within curly braces. These expressions are then evaluated and replaced with their corresponding values in the resulting string.

Example

Another example to convert an integer to exponential notation in Python is by using f-string formatting.

#define a function
def int_to_exponential(num):
    return f"{number:.2e}"

number = 362832
print('Input integer number:',number)
exponential = int_to_exponential(number)

# display the output exponential number 
print('Output exponential number:',exponential)

Output

Input integer number: 362832
Output exponential number: 3.63e+05

Using the str.format() method

In this approach, we will use the str.format() method with the {:e} format specifier to format the integer number in exponential notation.

Example

Here is an example, we will be using the str.format() method to convert a float to exponential notation.

#define a function
def int_to_exponential(num):
    return "{:e}".format(num)

number = 362832
print('Input integer number:',number)
exponential = int_to_exponential(number)

# display the output exponential number 
print('Output exponential number:',exponential)

Output

Input integer number: 362832
Output exponential number: 3.628320e+05

Using the string formatting technique

The “%e” format specifier in Python instructs the interpreter to convert a number to exponential notation with a default precision of six decimal places.

Example

In this example, we will use the expression '%e' % num to convert a number num to exponential notation.

#define a function
def int_to_exponential(num):
    return '%e' % num

number = 15421
print('Input integer number:',number)
exponential = int_to_exponential(number)

# display the output exponential number 
print('Output exponential number:',exponential)

Output

Input integer number: 15421
Output exponential number: 1.542100e+04