C++ Calculator

[ghPer]

A simple calculator

#include<iostream>


using namespace std;


int main()
{
	char buffer[256];
	do
	{
		int v = 1;
		cin >> buffer;
		
		bool opF = false;
		bool opS = false;
		bool opT = false;
		bool opA = false;
		for(int i =0; i < strlen(buffer); i++)
		{
			char op = buffer[i];
			
			
			switch ( op)
			{
				case '+':
				{
					if( opF )
					{
						v += buffer[i+1]-'0';
						opF = false;
						
					}
					else
					{
						v+= buffer[i-1]-'0';
						v+= buffer[i+1]-'0';			
					//	opF = true;
						v--;
					}
					opF=true;


				}break;
				
				case '-':
				{
					if( opS )
					{
						v -= buffer[i+1]-'0';
						opS = false;
						v+=1;
					}
					else
					{
						v-= buffer[i-1]-'0';
						v-= buffer[i+1]-'0';			
					//	opS = true;
						v+=2;
					}


					opS=true;
				}break;
				
				case '*':
				{
					if( opT )
					{
						v *= buffer[i+1]-'0';
						opT = false;
					}
					else
					{
						v*= buffer[i-1]-'0';
						v*= buffer[i+1]-'0';			
					//	opS = true;
					//	v+=2;
					}


					opT=true;
				}break;
				case '/'	:
				{
					if( opA )
					{
						v /= buffer[i+1]-'0';
						opA = false;
						
					}
					else
					{
						v/= buffer[i-1]-'0';
						v/= buffer[i+1]-'0';			
					//	opS = true;
					//	v+=2;
					}


					opA=true;
				}break;						


				default:break;
			}
		}
		cout << v << endl;


	//	cout << buffer << endl;
	}
	while(buffer[0] != '0');
	
}

Enter this: 9+1+2+1/2*2 and press enter