[Solved] How to add a number to an integer like a string

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If you want an int as result, multiply with the base:

int a = 5;
int b = 5;
int c = 10 * a + b;  // 55

If you want the result to be a std::string, use std::to_string (since C++11):

int a = 5;
int b = 5;
std::string c = std::to_string(a) + std::to_string(b);  // "55"

Before C++11, you can use a std::stringstream:

int a = 5;
int b = 5;
std::stringstream ss;
ss << a << b;
std::string c = ss.str();  // "55"

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solved How to add a number to an integer like a string