This tutorial will discuss about unique ways to compare a string and int in C++.
Table Of Contents
Technique 1: Using the std::to_string() function
To compare a string with an int value, we can first convert the int value to string, and then we can use the == operator of string class to compare two string objects. To convert an int to string, we can use the std::to_string() function. It accepts an int value as an argument, and returns a string value containing the digits in provided int value.
Once int is converted to a string value, then we can compare it with another string using the == operator.
Let’s see the complete example,
#include <iostream>
#include <string>
int main()
{
std::string strValue = "674";
int number = 674;
// Convert integer to string
// and compare with string
if (std::to_string(number) == strValue)
{
std::cout << "String and integer are equal \n";
}
else
{
std::cout << "String and integer are NOT equal \n";
}
return 0;
}
Output :
String and integer are equal
Technique 2: Using the stoi() function
To compare a string with an integer, first we need to convert the string into an integer. For that, we can use the std::stoi() function from header file <string>. It accepts a string as an argument, and interprets the string contents as an integer number. It converts the given string to int, and returns the int value. Once we have converted a string to int, then we can compare it with another int value.
Let’s see the complete example,
#include <iostream>
#include <string>
int main()
{
std::string strValue = "674";
int number = 674;
// convert string to integer
// and compare with integer
if (std::stoi(strValue) == number)
{
std::cout << "String and integer are equal \n";
}
else
{
std::cout << "String and integer are NOT equal \n";
}
return 0;
}
Output :
String and integer are equal
Summary
Today we learned about several ways to compare a string and int in C++. Thanks.