Remove last character from end of a string in C++

This post will discuss how to remove the last character from the end of the string in C++.

1. Using `pop_back()` function

The recommended approach is to use the pop_back() function introduced with C++11 to erase the last character of the string.

#include <iostream>

#include <string>

int main()

{

std::string s = "C,C++,Java,";

if (!s.empty()) {

s.pop_back();

}

std::cout << s;

return 0;

}

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Output:

C,C++,Java

2. Using `resize()` function

The string class also provides a resize() function that can be used to resize the string to a particular length.

#include <iostream>

#include <string>

int main()

{

std::string s = "C,C++,Java,";

if (!s.empty()) {

s.resize(s.size() - 1);

}

std::cout << s;

return 0;

}

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Output:

C,C++,Java

3. Using `erase()` function

Another efficient solution is to use the erase() function of the string class. It has two variants. We can either:

1. Get the iterator to the last character and call the erase() function.

#include <iostream>

#include <string>

int main()

{

std::string s = "C,C++,Java,";

if (!s.empty()) {

s.erase(std::prev(s.end()));

}

std::cout << s;

return 0;

}

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Output:

C,C++,Java

2. Pass the last character’s index to the erase() function, which erases the last character.

#include <iostream>

#include <string>

int main()

{

std::string s = "C,C++,Java,";

if (!s.empty()) {

s.erase(s.size() - 1);

}

std::cout << s;

return 0;

}

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Output:

C,C++,Java

Please note that calling the substr() function on the string doesn’t modify the original string but constructs a new string. This can still work, as demonstrated here.

That’s all about removing the last character from the end of a string in C++.

Remove last character from end of a string in C++

1. Using pop_back() function

2. Using resize() function

3. Using erase() function

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1. Using `pop_back()` function

2. Using `resize()` function

3. Using `erase()` function