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C++ Data Types
course content

Course Content

C++ Data Types

C++ Data Types

1. Introduction
OverviewArithmetic OperationsDivision int and doubleMath in C++Specifying a Type
2. Numerical Data Types
IntegersUsing IntegersType modifierFloatDoubleNumerical Data Types Summary
3. Text Data Type
CharStringIndexing a StringWorking With StringChanging The String PracticeFinding Text in a StringStrings in Memory
4. Other Data Types and Concepts
BooleanBoolean ExpressionsVoidAuto UnsignedImplicit Type ConversionExplicit Type Conversion

bookWorking With String

Append

As you saw in the previous chapter, we cannot add new characters to the end of a string using indexing. But C++ has a neat .append() method for that. Here is the syntax:

Concatenate

Another way to do it is by using the + operator.
It performs concatenation when applied to strings. Here is an example:

cpp

main

copy

              
12345678

            
#include <iostream>

int main()
{
    std::string str = "Code";
    str = str + "finity"; // or str += "finity"
    std::cout << str << std::endl;
}

It also allows adding text to the beginning or to both ends, which .append() is incapable of.

cpp

main

copy

              
12345678

            
#include <iostream>

int main()
{
    std::string str = "finity";
    str = "code" + str + ".com";
    std::cout << str << std::endl;
}

Insert

You can also insert new text to a string at a desired position.
Here is the syntax:

Where pos is an index, before which, new text is inserted.

Here is a gif of how insertion works:

Replace

You can also replace a part of a string with a different string.
This is achievable using the .replace() method. Here is the syntax:

Here start means the index of the first element to replace, and n stands for the length of a part to replace.

The following is a gif of how .replace() works.

Erase

You can also erase part of a string. Here is the syntax:

start and n parameters have the same meaning as in the .replace() method.

In this chapter, you learned

Here is an example of using all of the methods.

cpp

main

copy

              
123456789101112131415161718192021

            
#include <iostream>

int main()
{
    std::string str = "finity";
    
    str.append(".com"); // finity to finity.com
    std::cout << str << std::endl;
    
    str = "in" + str; // finity.com to infinity.com
    std::cout << str << std::endl;
    
    str.insert(2, "de"); // infinity.com to indefinity.com
    std::cout << str << std::endl;
    
    str.replace(0, 2, "co"); // indefinity.com to codefinity.com
    std::cout << str << std::endl;
    
    str.erase(10, 4); // codefinity.com to codefinity
    std::cout << str << std::endl;
}

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Section 3. Chapter 4
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