Написать калькулятор, работающий на указателях на функции - C++ - Ответ 16416692

double mul(double x, double y);

using foperation = double (*)(double, double);

const int OPS = 4;
foperation fops[OPS+1] {nullptr, mul, div, add, mns};

 
char ops_conv[256]{0};
ops_conv['+'] = 3;
ops_conv['-'] = 4;
ops_conv['*'] = 1;
ops_conv['/'] = 2;

#include <iostream>
 
double mul(double x, double y);
double div(double x, double y);
double add(double x, double y);
double mns(double x, double y);
 
using foperation = double (*)(double, double);
 
const int OPS = 4;
foperation fops[OPS+1] {nullptr, mul, div, add, mns};
 
int main()
{
   char ops_conv[256]{0};
   ops_conv['+'] = 3;
   ops_conv['-'] = 4;
   ops_conv['*'] = 1;
   ops_conv['/'] = 2;
   double x,y;
   char op='\n';
   std::cout << "Enter two values and operation symbol (\"*/+-\") between them. " << std::endl;
   std::cout << "Example : 2+2 " << std::endl;
   std::cin >> x >> op >> y;
   std::cout << x << op << y << " = " << fops[ops_conv[op]](x,y) << std::endl;
   return 0;
}
double mul(double x, double y){
   return x * y;
}
double div(double x, double y){
   return x / y;
}
double add(double x, double y){
   return x + y;
}
double mns(double x, double y){
   return x - y;
}