make a c++ calculator program

This is what i've so far, but it only works for 1 line

and i don't know how to square numbers

#include

using namespace std;

int main(){

int numbers;

int sum=0;

int sum1=0;

char opr='+' || '-' ;

int sumb;

while (cin>>sumb){

while(cin>>opr>>numbers){

if (opr=='+'){

sum=sum+numbers;

}

else if (opr=='-'){

sum1=sum1-numbers;

} else if (opr=='^'){

}

}

sumb+=sum+sum1;

cout

}

return 0;

}

info:

Write an even better calculator program calc3.cpp that can understand squared numbers. We are going to use a simplified notation X to mean X2. For example, 10 7 -51 should mean 102+7-512 Example: When reading input file formulas.txt 5A; 1000 6A - 5A+ 1; the program should report: $ ./calc3 formulastxt 25 1012 A hint: To take into account don't add or subtract new numbers right away after reading them. Instead, remember the number, read the next operator and if it is a ,square the remembered number, then add or subtract it