Please Modify My Code

Question

How to Make Calculator Taking input in 1 line using C++

https://sololearn.com/compiler-playground/cpLVlpycztIs/?ref=app

Answer 1

Try this:

#include <iostream>
#include <sstream>

using namespace std;

void Calculator(float num1, char op, float num2)
{
float result;
switch (op)
{
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
default:
cout << "Please Enter Correct Operation";
return;
}
cout << result;
}

int main()
{
string input;

getline(cin, input);
istringstream iss(input);

float num1, num2;
char op;

if (iss >> num1 >> op >> num2) {
Calculator(num1, op, num2);
} else {
cerr << "Invalid input format." << endl;
}
}

Answer 2

Jerry Hobby No My Intension Is not to spam I just wanted it to reach question to everyone and i dont thing anything wrong in it am not spamming

Answer 3

Shashikant Pandey
you should mark Jerry Hobby's answer as best. I only extended his suggestion... my code was only to show how istringstream could be used in a while loop.

Answer 4

Please don't spam your tags like this. You asked a C++ question but added tags for every other word you could think of.

Answer 5

Jerry Hobby Thank You Your Code Is Working As I Wanted

Answer 6

//or a while loop for multiline input
#include <iostream>
#include <sstream>
using namespace std;

void Calculator(float num1, char op, float num2){
float result;
switch (op){
case '+':
result = num1 + num2; break;
case '-':
result = num1 - num2; break;
case '*':
result = num1 * num2; break;
case '/':
result = num1 / num2; break;
default:
cout << "Please Enter Correct Operation";
}
cout << result << '\n';
}

int main(){
string input;
float num1, num2;
char op;
istringstream iss;

while(getline(cin, input)){
iss.clear();
iss.str(input);
if(iss >> num1 >> op >> num2){
cout<<num1<<" "<<op<<" "<<num2<<" = ";
Calculator(num1, op, num2);
}
else
cerr << "Invalid input format." << endl;
}
}

/*
sample input

1 + 1
3 - 1
4 / 2
2 * 5

*/

Answer 7

Bob_Li Thank You For Always Helping.

Answer 8

if you only want to process 1 equation, you can also write

cin >> num1 >> op >> num2;