1. Change the if-else statement in to a switch statement. (10 points) // include
ID: 657955 • Letter: 1
Question
1. Change the if-else statement in to a switch statement. (10 points)
// includes all necessary headers.
// <iostream> for cin and cout. <iomanip> for setprecision(), fixed, showpoint etc.
// <cmath> for pow function.
#include<iostream>
#include<string>
#include<cmath>
#include <iomanip>
using namespace std;
// main function
int main ()
{
// declaring variables
double num1, num2,answer ;
char symbol;
// Prompts user for choice of arimetic expression to use.
cout << "Please input calculation operation eg. (1 + 2): ";
cin >> num1 >> symbol >> num2 ;
// result if addition is chosen
if(symbol=='+'){
answer = num1 + num2;
}
// result if subtraction is chosen
else if(symbol == '-'){
answer= num1 - num2;
}
// result if multiplication is chosen
else if(symbol == '*'){
answer = num1 * num2;
}
// result if division is chosen
else if (symbol == '/'){
answer = num1 / num2;
}
// result if modulus is chosen
else if (symbol == '%'){
answer = static_cast<double>(static_cast<int>(num1) % static_cast<int>(num2));
}
// result if exponent is chosen
else if(symbol == '^'){
answer = pow ( num1, num2);
}
// output from the arimetic expression
cout << fixed << showpoint << setprecision(2);
cout << "The answer is:" << endl;
cout << num1 << " " << symbol << " " << num2 << " = " << answer << endl;
system("pause");
return 0;
}
Explanation / Answer
// <cmath> for pow function.
#include<iostream>
#include<string>
#include<cmath>
#include <iomanip>
using namespace std;
// main function
int main ()
{
// declaring variables
double num1, num2,answer ;
char symbol;
// Prompts user for choice of arimetic expression to use.
cout << "Please input calculation operation eg. (1 + 2): ";
cin >> num1 >> symbol >> num2 ;
switch(symbol) {
case '+': // result if addition is chosen
answer = num1 + num2;
break;
case '-':// result if subtraction is chosen
answer= num1 - num2;
break;
case '*':// result if multiplication is chosen
answer = num1 * num2;
break;
case '/':// result if division is chosen
answer = num1 / num2;
break;
case '%'://result if modulus is chosen
answer = static_cast<double>(static_cast<int>(num1) % static_cast<int>(num2));
break;
case '^': result if exponent is chosen
answer = pow(num1,num2);
break;
default:
/* If operator is other than +, -, * ,/ , % or ^, error message is shown */
printf("Error! operator is not correct");
break;
}
cout << fixed << showpoint << setprecision(2);
cout << "The answer is:" << endl;
cout << num1 << " " << symbol << " " << num2 << " = " << answer << endl;
system("pause");
return 0;
}
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