How do I fix my calculater

Question

Hello! I've been working on a 1 input calculater so you'll be able to do for example 7*5+3 and it will soulve it currectly I have a code, that code only works if you do for example 7*5*3 or 7+5+3+4 or 7-7-2-3 it only works if you do 1 oprator on it I'd really like someone to help me and fix it so you'll be able to do more oprations not just one this is the code:

// calculater 1.0 // works only with +
// made by Raz
#include <algorithm>
#include <iostream>
#include <string>
#include <sstream>

using namespace std;
int main()
{
string numbers = "";

int first = 0;
int second = 0;
int total = 0;
int count = 0;
int partplus = 0;
int totalplus = 0;
int totalminus = 0;
int totalmulti = 1;
int totaldev = 0;
int third = 0;
string str;

cout << "Please enter the numbers " << endl; // 15+32
getline(cin, numbers);
for (int i = 0; i < numbers.length(); i++){
str = str + numbers[i]; // 5+3-2+5 // 8,1,3
int first = stoi(str);
int second = stoi(str);
int third = stoi(str);
if (numbers[i] == '+') {
totalplus = totalplus + first; // 0=0+5
str = "";
}
if (numbers[i] == '-') {
count++;
if (count == 1) {
second = second*-1;
}
totalminus = totalminus-second;
str = "";
}
if (numbers[i] == '*') {
totalmulti = totalmulti * third;
str = "";
}
}
// plus case its just totalplus so its just in plus
first = stoi(str);
second = stoi(str);
third = stoi(str);
totalplus = totalplus + first;
totalminus = totalminus -second;
totalmulti = totalmulti * third;
cout << totalplus<< endl;
cout << totalminus<<endl;
cout << totalmulti << endl;
// can not be more than 11 numbers at ones
}

Answer 1

Gordie what do you mean by printing the lexemes

Answer 2

Gordie you mean extract the numbers and the operators so I'll know what is what?

Answer 3

Gordie well, I posted a code the other day that can detect numbers in a string like 23 34 435 instead of spaces I could use + this is what I used in my code that's the code
https://code.sololearn.com/c4vxY2YV7Gcl/?ref=app

Answer 4

Gordie for sure, whitespaces is like this right? " " By the way is there any way I can call you and you can help me after I am done with this?

Answer 5

Gordie why did you delete your last post?

Answer 6

Gordie but you see, the code that I gave you detects operators and numbers it's like if you see "+" for example so what it does it splits the numbers so what I tried to do in my code thay didn't work is when you see "+" i am adding it to the total +the number which you just input and that code didn't work

Answer 7

Gordie I understand, thank you I'll update you in the future on what's going on etc so I'll need to make a stack for it right? To do like * before the + etc

Answer 8

Gordie Got it, thanks