I got the jumping into c++ book and i've met functions again. This time, i kinda understand it (this is the 5th book i'm using to learn c++), last problem was vectors so i decided i needed a new book (this was after 2 failed functions learning and 1 failed array learning).

In this book, functions comes before arrays and the first time i met functions was in the cplusplus.com pdf, then in programming principles book which i just switched from and i had no idea what so ever what it did/what they were talking about, so i changed books. Now i've met it again and this book explains better.

I was writing calculator program and it doesn't seem right, it does everything right but it's like 2/3x more code than doing everything in

int main().

How would you use functions in a simple (+, -, /, *) calculator program?

My code is below.

Thanks.

#include <iostream> #include <string> double calc_add (double a, double B)/> { return a+b; } double calc_minus(double a, double B)/> { return a-b; } double calc_multiply(double a, double B)/> { return a*b; } double calc_divide(double a, double B)/> { return a/b; } void calculator () { double x = 0; double y = 0; char unit = ' '; std::string QUIT; do { std::cout <<"CALCULATOR \n\n"; std::cout <<"Enter operation: "; std::cin >> x >> unit >> y; switch (unit) { case '+': std::cout << calc_add(x, y); break; case '-': std::cout << calc_minus(x, y); break; case '*': std::cout << calc_multiply(x, y); break; case '/': std::cout << calc_divide(x,y); break; } std::cout << "\n\nDo you want to quit: "; std::cin >> QUIT; if (QUIT == "No") { system ("cls") ) } while (QUIT == "No"); } int main() { calculator(); return 0; }No indentation (no tab key on mobile).