Question

Can sombody tell me what wrong for this code to work?? It is c++ btw. thanks!

#include <iostream>

#include <string>

using namespace std;

double op1;
double op2;
string ADD;
string SUBTRACT;
string MULTIPLY;
string DIVIDE;
string selection;
string multiply;
string divide;
string add;
string subtract;

string "*";
string "+";
string "-";
string "/";

int main() {

do {
cout << "--------WELCOME TO THE CALCULATOR----------" << endl;

cout << "Enter your first operand: ";
cin >> op1;

cout << "Enter your second operand: ";
cin >> op2;
cout << endl;

cout << "Operations are:" << endl;

cout << "For addition enter: ADD or +" <<endl;
cout << "For subtraction enter: SUBTRACT or -" << endl;
cout << "For MUTLIPLACTION enter: MULTIPLY or *" << endl;
cout << "For DIVISION enter: DIVIDE or /" << endl;

cout << "Enter your selection: ";
cin >> selection;

switch(selection) {

case MULTIPLY:
{
answer1 = op1 * op2;
}
cout << "Your product is: " << answer1 << endl;
break;

case DIVIDE:
{
answer2= op1 / op2;
}
cout << "Your product is: " << answer2 << endl;
break;

case ADD:
{
answer3= op1 + op2;
}
cout << "Your product is: " << answer3 << endl;
break;

case SUBTRACT:
{
answer4= op1 - op2;
}
cout << "Your product is: " << answer4 << endl;
break;

case Multiply:
{
answer5 = op1 * op2;
}
cout << "Your product is: " << answer5 << endl;
break;

case divide:
{
answer6= op1 / op2;
}
cout << "Your product is: " << answer6 << endl;
break;

case add:
{
answer7= op1 + op2;
}
cout << "Your product is: " << answer7 << endl;
break;

case subtract:
{
answer8= op1 - op2;
}
cout << "Your product is: " << answer8 << endl;
break;

case '*' :
{
answer9 = op1 * op2;
}
cout << "Your product is: " << answer9 << endl;
break;

case '/' :
{
answer10= op1 / op2;
}
cout << "Your product is: " << answer10 << endl;
break;

case '+' :
{
answer11= op1 + op2;
}
cout << "Your product is: " << answer11 << endl;
break;

case subtract:
{
answer12= op1 - op2;
}
cout << "Your product is: " << answer12 << endl;
break;
}

Answer 1

//note:- if you have any query regarding this then comment below. please upvote. In your code, you are doing lots of mistakes. I rectify all and correct that.

#include <iostream>
#include <string>

using namespace std;
double op1;
double op2;
double answer;
int selection;

int main() {

char ch;
do {
cout << "--------WELCOME TO THE CALCULATOR----------" << endl;

cout << "Enter your first operand: ";
cin >> op1;

cout << "Enter your second operand: ";
cin >> op2;
cout << endl;

cout << "Operations are:" << endl;

cout << "For addition enter: 1" <<endl;
cout << "For subtraction enter: 2" << endl;
cout << "For MUTLIPLACTION enter: 3" << endl;
cout << "For DIVISION enter: 4" << endl;

cout << "Enter your selection: ";
cin >> selection;

switch(selection)
{

case 3:
{
answer = op1 * op2;
cout << "Your product is: " << answer << endl;
break;
}

case 4:
{
answer= op1 / op2;
cout << "Your product is: " << answer << endl;
break;
}

case 1:
{
answer= op1 + op2;
cout << "Your product is: " << answer << endl;
break;
}

case 2:
{
answer= op1 - op2;
cout << "Your product is: " << answer << endl;
break;
}

default:
{
cout<<"Invalid Choice";
break;
}

}
cout<<"Do you want to calculate more(press y for continue.)";

cin>>ch;
}
while(ch=='y');
}