/* https://www.sololearn.com/Discuss/910523/?ref=app [CHALLENGE] Easy calculation :) Let's do the calculations with functions! function zero() {} function one() {} function two() {} .... function nine(){} function plus() {} function minus() {} function multiply() {} function devidedBy() {} Tests: one(plus(two))) // Output is 3 seven(multiply(five())) // Output is 35 © 2017 SoloLearn Community */ #include /* A designated operator index. Used by calc function to decide which operation it should perform. */ int op; /* Function calc Description: Depending on , performs a certain math operation on and and return the result. However, when equals zero, this will simply return . */ int calc(int n1, int n2) { if(!op) return n1; int rv; switch(op) { case 1: rv = n1 * n2; break; case 2: if(n2) rv = n1 / n2; else rv = 0; // Division by zero break; case 4: rv = n1 % n2; break; case 8: rv = 1; for(int exp = 0; exp < n2; exp++) rv *= n1; break; case 0x10: rv = n1 + n2; break; case 0x20: rv = n1 - n2; break; default: rv = 0; } op = 0; return rv; } ////////////////////////////////////////////// ///////////////// NUMBERS ////////// ///////////////////////////////////////////// int zero(int v = 0) { return calc(0, v); } int one(int v = 1) { return calc(1, v); } int two(int v = 2) { return calc(2, v); } int three(int v = 3) { return calc(3, v); } int four(int v = 4) { return calc(4, v); } int five(int v = 5) { return calc(5, v); } int six(int v = 6) { return calc(6, v); } int seven(int v = 7) { return calc(7, v); } int eight(int v = 8) { return calc(8, v); } int nine(int v = 9) { return calc(9, v); } ///////////////////////////////////////////// ////////// OPERATORS ///////////// ///////////////////////////////////////////// int multiply(int v) { op = 1; return v; } int divideBy(int v) { op = 2; return v; } int modulo(int v) { op = 4; return v; } int power(int v) { op = 8; return v; } int plus(int v) { op = 0x10; return v; } int minus(int v) { op = 0x20; return v; } // Main procedure int main() { std::cout << "one(plus(two())) = " << one(plus(two())); std::cout << "\nseven(minus(six())) = " << seven(minus(six())); std::cout << "\nseven(multiply(five())) = " << seven(multiply(five())); std::cout << "\nfive(divideBy(zero())) = " << five(divideBy(zero())); std::cout << "\nseven(modulo(three())) = " << seven(modulo(three())); std::cout << "\ntwo(plus(eight(multiply(five())))) = [Magic Number] " << two(plus(eight(multiply(five())))); std::cout << "\nfive(power(two())) = " << five(power(two())); return 0; }

Challenge - Easy Calculation