File content as of revision 32:792c4239a738:

#include "mbed.h"
#include <time.h>
#include <string>
#include <iostream>

 //mbed pins
extern Serial pc;                                                                   //defines the communication between MBed and pc
int NoOfPins = 6;                                                                         //for how many sensors there are       
DigitalIn sensor[6] = {p5,p6,p7,p8,p9,p10} ;                                                 //array of sensors.  

 
//c++ variables
    time_t sensor_time ;                            //time at which sensor is broken
    int timeDiff;                          //time between 2 sensors - not used right now
    int times[6];                                //array the size of #pins
                                                  
int calculate()
{
    pc.printf("new program \n");                                            //alert user of initialisation   
      
    int i = 0; 
    while( i < 6)
    {
        while(!sensor[i]) 
        {
            if(sensor[i + 1]) {
                sensor_time = time(NULL); 
                i++; 
                }                                                         //error checking incase next one is done
        }
        sensor_time = time(NULL); 
        pc.printf(" %dth sensor: %d \t", i,sensor_time);  
        times[i] = sensor_time;                                                 //adds sensor times to array for logging.
        if ( i > 0) {                   //to ensure it is not the first one
       // pc.printf(" time[i] : %d  \t", times[i]);       //testing
       // pc.printf(" time[i -1] : %d  \t", times[i -1 ]);     //testing
        timeDiff  = difftime(times[i], times[i-1]);
        pc.printf(" timediff: %d  \t", timeDiff); 
        }
        i++;
    } 
      pc.printf(" \n Calculate completed \n");                                      //alert to let user know it completed
      for (int i = 0; i < 5 ; i++)                                          //printing module for array
      {
        pc.printf(" times: %d  \t", times[i]); 
       }
      
}