to_String C++

Strings are quite well-known concept of C++ that contains many characters, symbols, and numbers. Strings are variables that can be manipulated in many ways. C++ came up with the “to_string()” function to convert numbers, float values, exponential values, and expressions to strings after any calculation. Therefore, we will be looking at the to_string() function of C++ in today’s article. Let’s get started with the new file creation and opening with Ubuntu’s touch and nano instruction on the shell.

Example 01:

Here comes the simplest and first example to elaborate the working of the to_string() function applied on the numbers or float values. As this work has been done using C++, we need to add some C++ standard libraries. Within this code, we need only one, i.e. bits/stdc++.h. This has been utilized to use standard integers, floats, bits and display the output in a standard format. After that, the “std” namespace came up for our help to make use of “cout” and “cin” statements within our code without any problem.

The main() function begins with the initialization of a string variable “s1” getting a converted string value from the to_String() function. This variable s1 is taking an integer type value as a string after conversion through the to_String() method. The cout statement has been used to display that integer value converted to string in the shell via the variable “s1”. The next string type variable, s2, has been initialized again with the same to_String() method. This time, it takes a float type value in the parameter of the “to_String()” function. The cout statement comes again to display the value of variable s2 as converted string, i.e. float to string. The program has been completed.

Here comes to see the output of this given code. We need to compile it with a C++ compiler. In Ubuntu 20.04, we have got the g++ compiler to do that. Make sure to have it. So the g++ command has been used to compile the file “tostring.cc”. It got successful, and we are ready to execute the code with the “./a.out” query. After using it, we have got the integer and float value as a string on the shell, as you can see from the result.

Example 02:

The first example was about converting an integer and float value to a string and display on the terminal. This time, we will be looking at the conversion of a value having some exponent power with it. The exponent in C++ value can be displayed with the character “e”. So, let’s get started with the “bits/stdc++.h” C++ library inclusion in the new code. The “std” namespace is necessary to make out with cin and cout statements upon required. The main() code function is quite similar to the above example, with a change in the value to be converted. So, we have declared the first string type variable s1. It takes the value from the to_string() method after conversion in a string. The value it takes is 1 raised to the power +30, i.e. 1e+30. The next line utilizes the cout clause to display the shell value after conversion to a string.

Here comes another string type variable “s2” taking a converted exponent type value from the “to_String()” method of C++. The to_String() method has utilised the value 1 raise to the power -30 in its arguments and converted it to string. The value would be saved to the variable s2. The code needed to be saved before its execution via the Ctrl+S.

After saving this newly created code, we have compiled it. We have found no errors in return and executed the compiled code with the “./a.out” command. In return, the exponential values converted to strings have been displayed. The value with positive exponential power has been converted to a long float value, while the value with negative exponential value has been converted to all “0” float values, as demonstrated.

Example 03:

Let’s take a look at another example of using the to_string() C++ method in Ubuntu. This time, we will be looking at how to find a specific character from a converted string after using the “to_string” function. So, the code has been started with the same bits/stdc++.h header and the standard “std” namespace. The main() function starts with the string type variable s1 declaration. This variable has been taking the “integer” value from the to_String() method after conversion in a string. The find() function has been called with string s1 taking “2” as an argument. This has been utilized to get the value ‘2’ position in a string s1 with “+1”. The second string variable, s2, has been taking the converted string value from the “to_String()” method. In its case, the value converted through the to_string() method is a float value. Now the cout statement has been utilized to find out the location of a value 2 from the string s2. The same find() method has been called with the s2 variable on the spot, and the value position will be displayed. Now, the code has been all set to be compiled and executed on the shell.

The compilation command “g++” comes with the file name to compile this code. It returns no exceptions. After this, we have executed the compiled code file and got the below result. It returns 3 as the position of value 2 in strings s1 and s2 both.

Example 04:

Let’s have our last example to elaborate on the functionality of the to_string() method. This time, we have an “addition” operator in the code. We begin our new code with the same bits/stdc++.h library to utilize standard c++ values and statements. The “std” namespace is a must to be included. The main() function is a three-line code to elaborate the working of the to_String() function here. Here comes the initialization and declaration of a string variable s1. The to_String() function has been taking the sum and subtraction of some numbers in it. After addition and subtraction, the final value will be converted to a string and saved to the variable s1. The cout statement always came up here for our help to display the string s1 value on Ubuntu’s terminal shell. This was all about it. We have to take a look at the output of this code after saving it with the Ctrl+S shortcut.

The to_string() method taking numbers with operators in its parameters is firstly calculated to a perfect number, i.e. 19 and then converted to a string to be displayed on the shell.


To sum up, we have covered all the basic and needed concepts in our article to elaborate on the to_String() functionality. We have done with the conversion of simple integers, floats, exponential value, and mathematical expression into strings via the to_string() function of C++. We have also seen how to get the exact position of a particular character from a string within our example. Therefore, we hope that this article will be best for every C++ user.

About the author

Aqsa Yasin

I am a self-motivated information technology professional with a passion for writing. I am a technical writer and love to write for all Linux flavors and Windows.