Token Identifier

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int i,j;
    string a,str,s="+-*/=",op[]={"Addition","Subtraction","Multiply","Division","Assignment"};
    getline(cin,a);
    for(i=0;i<a.length();i++){
        if(isalpha(a[i])){
            printf("%c",a[i++]);
            while((isalpha(a[i])||isdigit(a[i]))&&a[i])
                printf("%c",a[i++]);
            printf(" = is an identifier\n");
            i--;
        }
        else if(isdigit(a[i])){
            printf("%c",a[i++]);
            while(isdigit(a[i])&&a[i])
                printf("%c",a[i++]);
            printf(" = is a number\n");
            i--;
        }
        else if(a[i]==';')printf("; = End of line\n");
        else{
            for(j=0;s[j];j++){
                if(s[j]==a[i]){
                    printf("%c = %s Operator\n",a[i],op[j].c_str());
                    break;
                }
            }
        }
    }
    return 0;
}