Convert Char Array to an integer in C++

This tutorial will discuss about a unique way to convert char array to an integer.

In C++, the string.h header file provides a function stoi(). It accepts a character pointer as an argument, and interprets its contents as an integer value. It returns an int value. We can use this function to convert a char array to integer.

If the given string can not be converted into an integer value or its out of range, then it will raise an exception i.e. either invalid_argument or out_of_range exception. Therefore, while using the stoi() function for converting a char array to int, we need to make sure that we catch all the exceptions.

Let’s see the complete example,

#include <iostream>
#include <string.h>

// Returns true, string is successfully conveted
// to integer
bool ConverToInt(const char* arr, int& value )
    bool result = false;
        // convert char array to string
        value = std::stoi( arr);
        result = true;
    catch( const std::exception& )
    return result;

int main()
    char arr[10] = "234";
    int value = 9;

    // Convert char array to integer
    if(ConverToInt(arr, value) )
        std::cout<<"Integer Value is : " << value << std::endl;
        std::cout<<"Char Array can not be converted to an integer \n";

    return 0;

Output :

Integer Value is : 234


Today we learned about several ways to convert char array to an integer. Thanks.

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