#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <ctime>
// #include <ctype>
#include <iostream>
// #include <vector>

using namespace std;

int isinword(char c) {
  return (isalpha(c) || (c==39));  
}

void scramble(char* s) {
  for(int i = 0; i < strlen(s); i++) {
    int position = rand() % strlen(s);

    char temp = s[i];
    s[i] = s[position];
    s[position] = temp;
  }
}

int main(int argc, char *argv[]) {
  
  char filename[200];
  printf("What's the name of the file: ");
  gets(filename);
  if(strlen(filename)==0);
  strcpy(filename,"scramble.txt");

  FILE* f;
  f = fopen(filename,"r");
  if (!f)
    return 1;

  char line[1001];  
  char word[30];
  char midword[30];
  while (fgets(line,1000,f)) {    
    int linelen = strlen(line);
    for (int i=0;i<linelen;i++) {
      if (isinword(line[i])) {    // start a word
        int start = i;
        while (isinword(line[i]))   // look for the end of the word
          i++;
        int end = i;              
        int wordlen = end-start;
        strncpy(word,line+start,wordlen);  
        word[wordlen] = 0;                
        
        if (wordlen > 3) {    
        strncpy(midword,word+1,wordlen-2);  
        midword[wordlen-2] = 0;            
          
        scramble(midword);  // scramble(midword);
        strncpy(line+start+1,midword,strlen(midword));  // use strncpy to copy midword back into line at the appropriate place
        }    
        // keep track of # words, word lengths
      }
    }  
    printf("%s\n",line);  
    // print the modified line (center it on the screen)
    // keep track of # lines
  }
  printf("\n\n");
  
  // print summarys


  fclose(f);

  system("PAUSE");
  return 0;
}