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#include <iostream>
int main()
{
char menuinput, p2m;
int plus1, plus2, plus3, min1, min2, min3, mul1, mul2, mul3;
double div1, div2, div3;
//main menu
mainmenu:
for (;;) {
do {
std::cout << "********************************************\nWelcome to Michael's Standard Calculator v1.\n********************************************\n\n\n\n";
std::cout << "Enter 1 for plus!\nEnter 2 for minus!\nEnter 3 for multiply\nEnter 4 for divi\nEnter q to quit (case sensitive)\n";
std::cin >> menuinput;
}
while (menuinput < '1' || menuinput > '4'&& menuinput != 'q');
//The actual calculators
if (menuinput == 'q'){
goto Programend;
}
switch (menuinput)
{
//Plus calculator
case '1':
plus:
std::cout << "Enter the first number: ";
std::cin >> plus1;
std::cout << "Enter the second number: ";
std::cin >> plus2;
plus3 = plus1 + plus2;
std::cout << plus1 << " + " << plus2 << " = " << plus3 << "\n\n"; //Display plus
std::cout << "Enter b to do another calculation\nEnter m to go back to the main menu\nEnter q to quit\n\n";
inv1:
std::cin >> p2m;
if (p2m == 'b') goto plus;
else if (p2m == 'm') goto mainmenu;
else if (p2m == 'q') goto Programend;
else {
std::cout << "You have selected an invalid option, please try again.";
goto inv1;
}
break;
case '2':
minus:
std::cout << "Enter the first number: ";
std::cin >> min1;
std::cout << "Enter the second number: ";
std::cin >> min2;
min3 = min1 - min2;
std::cout << min1 << " - " << min2 << " = " << min3 << "\n\n"; //Display plus
std::cout << "Enter b to do another calculation\nEnter m to go back to the main menu\nEnter q to quit\n\n";
inv2:
std::cin >> p2m;
if (p2m == 'b') goto minus;
else if (p2m == 'm') goto mainmenu;
else if (p2m == 'q') goto Programend;
else {
std::cout << "You have selected an invalid option, please try again.";
goto inv2;
}
break;
case '3':
multiply:
std::cout << "Enter the first number: ";
std::cin >> mul1;
std::cout << "Enter the second number: ";
std::cin >> mul2;
mul3 = mul1 * mul2;
std::cout << mul1 << " X " << mul2 << " = " << mul3 << "\n\n"; //Display plus
std::cout << "Enter b to do another calculation\nEnter m to go back to the main menu\nEnter q to quit\n\n";
inv3:
std::cin >> p2m;
if (p2m == 'b') goto multiply;
else if (p2m == 'm') goto mainmenu;
else if (p2m == 'q') goto Programend;
else {
std::cout << "You have selected an invalid option, please try again.\n";
goto inv3;
}
break;
case '4':
division:
std::cout << "Enter the first number: ";
std::cin >> div1;
std::cout << "Enter the second number: ";
std::cin >> div2;
div3 = div1 / div2;
std::cout << div1 << " X " << div2 << " = " << div3 << "\n\n"; //Display plus
std::cout << "Enter b to do another plus calculation\nEnter m to go back to the main menu\nEnter q to quit";
inv4:
std::cin >> p2m;
if (p2m == 'b') goto division;
else if (p2m == 'm') goto mainmenu;
else if (p2m == 'q') goto Programend;
else {
std::cout << "You have selected an invalid option, please try again.\n";
goto inv4;
}
break;
}
}
//Program end!
Programend:
std::cout << "Thank you for using the program! ENTER ANY KEY TO QUIT! ";
std::cin.get();
std::cin.ignore();
return 0;
}
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