Entropy text analyzer

#include <iostream>
#include <cstdio>
#include <map>
#include <cmath>
#include <cstring>
#include <sstream>
#include <string>
using namespace std;

map<string,int>m;
int total;
void Procesar(string & s){
    for (unsigned int i=0;i<s.size();i++){
        if ((s[i]==',') || (s[i]=='.') ||(s[i]==';') ||(s[i]=='(') ||(s[i]==')') ||(s[i]==':') ||(s[i]=='?') ||(s[i]=='!') ||(s[i]=='"'))
            s[i]=' ';
        else if (s[i]>='A' && s[i]<='Z')
            s[i]=s[i]+'a'-'A';

    }
    istringstream ss(s);
    string w;
    while (ss >> w) {
        m[w]++;
        //cout<<w<<endl;
        total++;
    }
}
int main(){
    char s1[100];
    while(gets(s1)){
        //cout<<s1<<endl;
        string s(s1);
        if (s=="****END_OF_INPUT****") break;
        m.clear();total=0;
        if (s=="****END_OF_TEXT****"){
            printf("0 0.0 0\n");
            continue;
        }
        while (s!="****END_OF_TEXT****"){
            //cout<<s1<<endl;
            Procesar(s);
            //printf("s:-%s-",s);
            gets(s1);
            s=string(s1);
        }
        float et=0,gg=log10(total);
        for (map<string,int>::iterator it=m.begin(); it!=m.end(); it++){
            et=et+(it->second)*( gg - log10(it->second));
        }
        et=et/total;
        float erel=et/log10(total)*100.0;
        if (total==0)
            printf("0 0.0 0\n");
        else
            printf("%d %.1f %.0f\n",total,et,erel);
    }
    return 0;
}