Check out example codes for "c++ parse int". It will help you in understanding the concepts better.

Code Example 1

std::string s = "10";
int i = std::stoi(s);

Code Example 2

atoi( str.c_str() )

Code Example 3

#include <sstream>

int i = 123;
std::string out_string;
std::stringstream ss;
ss << i;
out_string = ss.str();

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