How to Combine Strings and Integers in C ?

How to concatenate a String and an Integer in C

Concatenating a string and an integer in C can be done in several ways. Here are a few common methods:

1. Using Boost's lexical_cast

std::string name = "John";
int age = 21;
std::string result = name + boost::lexical_cast<std::string>(age);

2. Using C 11's to_string()

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

3. Using FastFormat

std::string name = "John";
int age = 21;
std::string result;
fastformat::fmt(result, "{0}{1}", name, age);

4. Using IOStreams

std::string name = "John";
int age = 21;
std::stringstream sstm;
sstm << name << age;
std::string result = sstm.str();

5. Using itoa()

std::string name = "John";
int age = 21;
char numstr[21]; // enough to hold all numbers up to 64-bits
std::string result = name + itoa(age, numstr, 10);

6. Using sprintf()

std::string name = "John";
int age = 21;
char numstr[21]; // enough to hold all numbers up to 64-bits
sprintf(numstr, "%d", age);
std::string result = name + numstr;

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