Intermediate code generator ( Three address code) simple

InterCodeGen.cpp

//SIMPLE INTERMEDIATE CODE GENERATOR (3 ADDRESS CODE)
//Author:   Rupal Barman
//Modified: 5/11/16
// Does not consider the operator precedence, ie. generates the 3 address code from left to right directly.
// INPUT example:   t = q * p + g ;   (don't forget to end the statement with a ';' or any character, even a space would work)
// OUTPUT example:  v=r*j;  w=v+h                                                                                                                                                                                                                                                                                                                         

#include <iostream>
#include <stdio.h>
#include <string.h>

using namespace std;

char input[20];
char op, op1, op2;

char temp[5]={'v','w','x','y','z'};
int temp_pointer=0;

void scan()
{
    for(int i=0;i<strlen(input); i++)
    {
        if((input[i]=='+')||(input[i]=='-')||(input[i]=='*')||(input[i]=='/'))
        {
            op=input[i];
            op1=input[i-1];
            op2=input[i+1];
           
            cout<<"\n"<<temp[temp_pointer]<<"="<<op1<<op<<op2<<"\n";
            input[i+1]=temp[temp_pointer++];
        }
    }
}

int main()
{
   cout<<"\nEnter expression:";
   cin>>input;
   input[strlen(input)-1]='\0';
   scan();
  
   return 0;
}