Template literals are a feature in JavaScript that allow you to create strings with embedded expressions.

To use template literals, you need to use backticks (`) instead of single or double quotes. Then, you can include expressions inside ${} within the backticks. These expressions can be variables, function calls, or any valid JavaScript expression.

Here's an example:

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const name = "SheCodes";
const greeting = `Welcome to ${name}!`;

console.log(greeting); // Output: Welcome to SheCodes!

In the example above, a variable name is defined with the value "SheCodes". The greeting variable uses a template literal to create a string that includes the value of the name variable.

You can use template literals to dynamically create strings and concatenate variables or values in a more concise and readable way compared to traditional string concatenation.

You can concatenate two variables into a string in JavaScript using the plus (+) operator. Here's an example:

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let name = "John";
let age = 30;
let sentence = "My name is " + name + " and I am " + age + " years old.";
console.log(sentence); // Output: "My name is John and I am 30 years old."

In this example, the variables name and age are concatenated into the string sentence to create a sentence that includes both variables.

To concatenate a string with an integer in the middle in C++, you can use std::to_string() function. This function will convert an integer to a string, which you can then concatenate with another string using the + operator. Here's an example code:

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#include <iostream>
#include <string>

int main() {
    int num = 42;
    std::string str = "The answer to life, the universe and everything is " + std::to_string(num) + ".";
    std::cout << str << std::endl;

    return 0;
}

Output:

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The answer to life, the universe and everything is 42.

In this code, we declared an integer variable num and initialized it to 42. Then we concatenated the string "The answer to life, the universe and everything is " with the integer num that has been converted to a string using std::to_string(). Finally, we concatenated the resulting string with "." using the + operator and stored it in the str variable.

Assuming you want to display the temperature of 21 degrees in Celsius with the degree symbol, you can simply concatenate "°C" at the end of the temperature value.

Here's an example in JavaScript:

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let temperature = 21;
temperature += "°C"; // add the degree symbol and "C" to the temperature value
console.log(temperature); // output: "21°C"

Alternatively, you can use a template literal to achieve the same result:

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let temperature = 21;
console.log(`${temperature}°C`); // output: "21°C"