How Can I Efficiently Concatenate a String and an Integer in C ?

Concatenating a std::string and an int

Concatenating a string and an integer in C can be a simple task, but there are several ways to do it, each with its own advantages and disadvantages.

One of the most straightforward approaches is to use the operator, which is overloaded to perform concatenation for std::string objects. For example:

std::string name = "John";
int age = 21;
std::string result = name + std::to_string(age);

This will result in the string John21. However, it is important to note that the operator will not work if the integer is not converted to a string first.

Another approach is to use the std::stringstream class, which can be used to convert any data type to a string. For example:

std::stringstream sstm;
sstm << name << age;
std::string result = sstm.str();

This approach is more verbose than using the operator, but it is more flexible and can be used to concatenate any data types.

Finally, there are a number of third-party libraries that provide functions for concatenating strings and integers. For example, the Boost library provides the boost::lexical_cast function, which can be used as follows:

std::string result = boost::lexical_cast<std::string>(age);

The choice of which approach to use will depend on the specific needs of your program. However, the operator is generally the most convenient and efficient option when concatenating a string and an integer.

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