Interpolation is the process of inserting values into a string by using placeholders or variables. C++ provides various ways to interpolate strings, some of which are:
1. Using the + operator:
The simplest way to interpolate strings in C++ is by using the concatenation operator +. Here is an example:
``c++
#include
#include
using namespace std;
int main() {
string name = "John";
int age = 25;
string message = "My name is " + name + " and I am " + to_string(age) + " years old.";
cout << message << endl;
return 0;
}
Here, we have defined a string variable name and an integer variable age. We have created a new string variable message and used the concatenation operator + to insert values from the name and age variables into the string.
2. Using stringstream:
Another way to interpolate strings in C++ is by using stringstream. The stringstream class provides a convenient way of concatenating values of various types into a string. Here is an example:
#include
#include
#include
using namespace std;
int main() {
string name = "John";
int age = 25;
stringstream ss;
ss << "My name is " << name << " and I am " << age << " years old.";
string message = ss.str();
cout << message << endl;
return 0;
}
Here, we have defined a string variable name and an integer variable age. We have created a stringstream object ss and used its << operator to insert values from the name and age variables into the string.
Note that we can also use the to_string function to convert numeric values to strings before inserting them into the stringstream object.
3. Using sprintf:
The sprintf function in C++ can also be used to interpolate strings. It works by formatting a string with variables in C-style. Here is an example:
#include
#include
#include
using namespace std;
int main() {
string name = "John";
int age = 25;
char message[100];
sprintf(message, "My name is %s and I am %d years old.", name.c_str(), age);
cout << message << endl;
return 0;
}
``
Here, we have defined a string variable name and an integer variable age. We have created a char array message and used the sprintf function to insert values from the name and age variables into the string.
Note that we have used the c_str function to convert the name variable to a C-style string before inserting it into the sprintf function.