Return Multiple Values in C++ Function: How To

When working with C++, it is common to need a function that returns multiple values. While some programming languages make this easy with built-in functionality, C++ requires a bit more effort. Here are some tips on how to return multiple values in C++ functions:

├Źndice
  1. Using Structs
  2. Using Pointers
  3. Conclusion

Using Structs

One way to return multiple values in a C++ function is to use structs. A struct is a user-defined data type that can hold multiple variables of different data types. By using a struct, you can create a container for all the values you need to return.


struct Values {
    int value1;
    double value2;
    string value3;
};

Values myFunction() {
    Values result;
    // do some calculations and assign values to result
    return result;
}

In the example above, we define a struct called "Values" that contains an integer, a double, and a string. We then create a function called "myFunction" that returns a "Values" object. Inside the function, we perform some calculations and assign values to the different members of the "Values" object "result". Finally, we return the "result" object.

Using Pointers

Another way to return multiple values in a C++ function is to use pointers. A pointer is a variable that stores the memory address of another variable. By passing pointers as function arguments, you can modify the values of the original variables outside of the function.


void myFunction(int* value1, double* value2, string* value3) {
    // do some calculations and assign values to value1, value2, and value3
}

int main() {
    int myInt;
    double myDouble;
    string myString;
    myFunction(&myInt, &myDouble, &myString);
    // myInt, myDouble, and myString now have the values assigned in myFunction
    return 0;
}

In the example above, we define a function called "myFunction" that takes three pointers as arguments. Inside the function, we perform some calculations and assign values to the variables pointed to by the pointers. In the main function, we declare three variables and pass their memory addresses to "myFunction". After the function call, the variables "myInt", "myDouble", and "myString" now have the values assigned in "myFunction".

Conclusion

Returning multiple values in a C++ function can be achieved using structs or pointers. By using structs, you can create a container for all the values you need to return. By using pointers, you can modify the values of the original variables outside of the function. Choose the method that best suits your needs and coding style.

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