Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Impara Common String Methods | Text Data Type
C++ Data Types
course content

Contenuti del Corso

C++ Data Types

C++ Data Types

1. Introduction
OverviewArithmetic OperationsDivision int and doubleStandard MathSpecifying a Type
2. Numerical Data Types
Overview of Integer TypesApplications of Integer TypesType Modifiers for VariablesWorking with Floating-Point NumbersDouble-Precision Numbers
3. Text Data Type
Character Data TypeString Data TypeAccessing and Manipulating String ElementsCommon String MethodsString Manipulation PracticeSearching Within Strings
4. Other Data Types and Concepts
Boolean Data TypeBoolean ExpressionsVoid Data TypeAutomatic Type DeductionUnsigned Data TypesImplicit Type ConversionExplicit Type Conversion

book
Common String Methods

Append

We saw that adding new characters to the end of a string using indexing is not possible. However, there is a convenient .append() method for this purpose.

append.h

append.h

copy

              
1

            
str.append("added part");

Concatenate

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

main.cpp

main.cpp

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.

main.cpp

main.cpp

copy

              
12345678

            
#include <iostream>

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

Insert

You can insert new text into a string at a specific position using the .insert() method.

insert.h

insert.h

copy

              
1

            
str.insert(pos, "text to add");

The position, specified by the pos parameter, determines where the new text will be added.

The new text is inserted before the character currently at the given position. This method is useful for dynamically modifying strings without creating new ones.

Replace

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

replace.h

replace.h

copy

              
1

            
str.replace(start, n, "new text");

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 remove a portion of a string using the .erase() method. This is useful when you need to delete specific characters or substrings from a string.

erase.h

erase.h

copy

              
1

            
str.erase(start, n);

If the n parameter matches or exceeds the remaining length of the string from start, all characters from start onward will be erased.

The start and n parameters work similarly to those in the .replace() method, providing flexibility to modify the string as needed.

main.cpp

main.cpp

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;
}

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 4

Chieda ad AI

expand

Chieda ad AI

ChatGPT

Chieda pure quello che desidera o provi una delle domande suggerite per iniziare la nostra conversazione

course content

Contenuti del Corso

C++ Data Types

C++ Data Types

1. Introduction
OverviewArithmetic OperationsDivision int and doubleStandard MathSpecifying a Type
2. Numerical Data Types
Overview of Integer TypesApplications of Integer TypesType Modifiers for VariablesWorking with Floating-Point NumbersDouble-Precision Numbers
3. Text Data Type
Character Data TypeString Data TypeAccessing and Manipulating String ElementsCommon String MethodsString Manipulation PracticeSearching Within Strings
4. Other Data Types and Concepts
Boolean Data TypeBoolean ExpressionsVoid Data TypeAutomatic Type DeductionUnsigned Data TypesImplicit Type ConversionExplicit Type Conversion

book
Common String Methods

Append

We saw that adding new characters to the end of a string using indexing is not possible. However, there is a convenient .append() method for this purpose.

append.h

append.h

copy

              
1

            
str.append("added part");

Concatenate

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

main.cpp

main.cpp

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.

main.cpp

main.cpp

copy

              
12345678

            
#include <iostream>

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

Insert

You can insert new text into a string at a specific position using the .insert() method.

insert.h

insert.h

copy

              
1

            
str.insert(pos, "text to add");

The position, specified by the pos parameter, determines where the new text will be added.

The new text is inserted before the character currently at the given position. This method is useful for dynamically modifying strings without creating new ones.

Replace

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

replace.h

replace.h

copy

              
1

            
str.replace(start, n, "new text");

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 remove a portion of a string using the .erase() method. This is useful when you need to delete specific characters or substrings from a string.

erase.h

erase.h

copy

              
1

            
str.erase(start, n);

If the n parameter matches or exceeds the remaining length of the string from start, all characters from start onward will be erased.

The start and n parameters work similarly to those in the .replace() method, providing flexibility to modify the string as needed.

main.cpp

main.cpp

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;
}

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 4
some-alt