C++ Program For int to char Conversion

In this article, we will learn how to convert int to char in C++. For this conversion, there are 5 ways as follows:

1. Using typecasting.
2. Using static_cast.
3. Using sprintf().
4. Using to_string() and c_str().
5. Using stringstream.

Let’s start by discussing each of these methods in detail.

Examples:

Input: N = 65 
Output: A 

Input: N = 97 
Output: a

1. Using Typecasting

Method 1:

1. Declaration and initialization: To begin, we will declare and initialize our integer with the value to be converted.
2. Typecasting: It is a technique for transforming one data type into another. We are typecasting integer N and saving its value in the data type char variable c.
3. Print the character: Finally, print the character using cout. 

Below is the C++ program to convert int to char using typecasting:

C++

// C++ program to convert
// int to char using typecasting
#include <iostream>
using namespace std;

// Driver code
int main()
{
  int N = 97;
  cout << char(N);
  return 0;
}

Output

a

Method 2:

1. Declaration and initialization: To begin, we will declare and initialize our integer with the value to be converted.
2. Typecasting: Declare another variable as character c and assign the value of N to the C
3. Print the character: Finally, print the character using cout. 

Below is the C++ program to convert int to char using typecasting:

C++

// C++ program to convert
// int to char using typecasting
#include <iostream>
using namespace std;

// Driver code
int main()
{
  int N = 65;
  char c = N;
  cout << c;
  return 0;
}

Output

A

2. Using static_cast

The integer can be converted to a character using the static_cast function. Below is the C++ program to convert int to char using static_cast:

C++

// C++ program to convert
// int to char using static_cast
#include <iostream>
using namespace std;

// Driver code
int main()
{
    int N = 65;

    char c = static_cast<char>(N);
    cout << c;
    return 0;
}

Output

A

3. Using sprintf()

Allot space for a single int variable that will be converted into a char buffer. It is worth noting that the following example defines the maximum length Max_Digits for integer data. Because the sprintf function sends a char string terminating with 0 bytes to the destination, we add sizeof(char) to get the char buffer length. As a result, we must ensure that enough space is set aside for this buffer.

Below is the C++ program to convert int to char using sprintf():

C++

// C++ program to convert
// int to char using sprintf()
#include <iostream>
using namespace std;
#define Max_Digits 10

// Driver code
int main()
{
  int N = 1234;
  char n_char[Max_Digits +
              sizeof(char)];
  std::sprintf(n_char,
               "%d", N);
  std::printf("n_char: %s \n",
               n_char);
  return 0;
}

Output

n_char: 1234 

4. Using to_string() and c_str()

The to string() function transforms a single integer variable or other data types into a string. The c_str() method converts a string to an array of characters, terminating with a null character.

Below is the C++ program to convert int to char using to_string() and c_str():

C++

// C++ program to convert
// int to char using sto_string()
// and c_str()
#include <iostream>
using namespace std;

// Driver code
int main()
{
    int N = 1234;

    string t = to_string(N);
    char const *n_char = t.c_str();

    printf("n_char: %s \n",
            n_char);
    return 0;
}

Output

n_char: 1234 

5. Using stringstream

A stringstream connects a string object to a stream, allowing you to read from it as if it were a stream (like cin). Stringstream requires the inclusion of the sstream header file. The stringstream class comes in handy when processing input.

Below is the C++ program to convert int to char using stringstream:

C++

// C++ program to convert
// int to char using
// stringstream
#include <iostream>
using namespace std;
#include <sstream>

// Driver code
int main()
{
    int N = 1234;
    std::stringstream t;
    t << N;
    char const *n_char =
         t.str().c_str();
    printf("n_char: %s \n",
            n_char);;
    return 0;
}

Output

n_char: 1234 

Method: Converting int value to char by adding 0

C++

// C++ program to convert
// int to char using typecasting by adding zero

#include <iostream>
using namespace std;

//Driver code
int main()
{
    int number = 65;
    char charvalue = (char(number)+0);
    cout << charvalue;
    return 0;
}

Output

A

Time complexity: O(1).

Auxiliary space: O(1).