Question

Write a program that takes an operation (+, -, /, or *) and two floating-point numbers, and outputs the result of applying that operation to the two numbers. For example, if the input is:

+ 100 3.14

the output should be

100 + 3.14 = 103.14

Likewise, if the input is

* 4 5

the output should be

4 * 5 = 20

You may assume the input is well-formed; that is, the first string is one of the four operators, and the next two items are valid floating-point numbers.

Hint: Read a char and two doubles, then use a switch statement to select the proper operation. Note that there is no need for a loop in this exercise; you only have one line of input.

Please help me as soon as possible!!!!! Thank you!!!

Answer 1

#include <iostream>
using namespace std;
int main()
{
    char ch;
    double num1, num2,result=0;

   
    //storing operator and double values in variables
    cin >>ch >> num1 >> num2;
   
    switch(ch)
    {
        //based on operator corresponding operation will be performed
        case '+':result = num1+num2;
                 break;
        case '-':result = num1-num2;
                 break;
        case '*':result = num1*num2;
                 break;
        case '/':result = num1/num2;
                 break;
        default :printf("Invalid operator");
                 break;
    }
    // displayed final result
    cout << num1<<" "<< ch <<" "<<num2 <<" = "<<result;
}

CppDroid project_jun17a.cpp Editor Navigator 1 2#include <iostream> 3 using namespace std; 4 int main( 5 char ch; double num1, num2, result=0 ; 6 7 8 9 //storing operator and double values in |variables cin ch >> num1 >> num2; 10 11 12 switch(ch) { //based on operator corresponding operation 13 14 15 will be performed case '+'result break; case'result 16 num1+num2; 17 18 num1-num2; break; case *'result 19 num1 num2; 20 break; 21 case 'result 22 num1/num2; break; 23 default printf("Invalid operator"); 24

CppDroid project_jun17a.cpp Editor Navigator double num1, num2,result=0; 8 9 //storing operator and double values in |variables cin >ch >> num1 >> num2; 10 11 12 switch(ch) { /based on operator corresponding operati 13 14 15 will be performed case 'result 16 num1+num2; = break; 17 18 case 'result num1-num2; break; 19 case result 20 num1num2; break; 21 case '/'result 22 num1/num2; break; 23 default printf("Invalid operator"); 24 break; 25 } 26 /displayed final result cout << num1<<" "<< ch <<" "<<num2 <<' 27 28 "<<result; 29 }

10:12 AM CppDroid terminal Stopped + 100 3.14 100 + 3.14 = 103.14 Get premium! Remove ad banner O V

10:12 AM CppDroid terminal < Stopped * 4 5 4 * 5 = 20 Terminal session stopped Get premium! Remove ad banner O V