How Do I Convert Numbers to Strings and Strings to Numbers in C ?

Converting Numbers to Strings and Vice Versa in C

Many developers frequently encounter the need to convert numbers to strings (and vice versa) in C . This guide will provide comprehensive solutions for this task.

String to Numeric

C 11 and Later

Since C 11, the header includes the following functions for converting strings to numbers:

• stof, stod, stold: Convert to float, double, and long double, respectively.
• stoi, stol, stoul, stoll, stoull: Convert to int, long, unsigned long, long long, and unsigned long long, respectively.

C 03 and Earlier

For C 03 and earlier, you can use the stringstream class, as shown below:

#include <sstream>

//...

std::stringstream ss;
int value;

ss << value;  // Convert int to string
ss >> value;  // Convert string to int

Numeric to String

C 11 and Later

• to_string: Converts various number types to strings.

C 03 and Earlier

• stringstream: Use the stringstream class to convert numbers to strings, as shown above.
• Stringstreams: Manipulate output formatting using stream manipulators, such as setprecision and scientific.

Example:

using namespace std;

ostringstream ss;
ss << std::setprecision(4) << 300.123456;
string value = ss.str();

By following these methods, you can effectively convert numbers to strings and vice versa in C for various versions of the language.

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