almost got it (but not quite)
this program prompts the user for a voltage reading then converts it to pressure. it also accepts default value (user pressing return).
what im "trying" to do now is print to the screen this:
reading pressure
1 x//x is value of pressure
2 x//changing for every input
3 x
4 x
etc......
what i get is this
reading pressure
1 0//all the pressure values are identical
2 0//they are all the last entered
3 0
etc.......
can i assign the user input to an array and how?
or can i do it by writing to a file (its already doing this) but read the required lines int the display array at the end of program
thank for trying to help. here's the source...
/************************************************** *
THIS IS MY PRESSURE CONTROL PROGRAM
DESIGNED TO ALERT THE USER TO ANY
PROBLEMS WITH THE PRESSURE READINGS.
ERASES the existing information in a file,
then APPENDS the pressure to that file!!!
ios::trunc == delete information in file // say IF entries>12
ios::app == open file for appending
contains a default (press return) process!!!
************************************************** */
#include<iostream.h>
#include<fstream.h>
#include<iomanip.h>
#include<stdlib.h>
#include<string.h>
float voltage;//assign memory space
float pressure;//
float riser1;//used to record whether the temp rises consecutively
float riser2;//
int count;//used to count entries before "ios::trunc" (clearing file)
int rcount;//riser counter
float parray[12];//pressure array
float rarray[12];//reading array
int index;//acts as counter for pressure array
int index2;//counter for reading array
void main()
{
char rnumber[12];
char reading[12];
char buff[100];
ofstream outfile;//setting up stream (called outfile)
outfile.open("C:\\pressure.txt",ios::trunc);/*clear existing file BEFORE the loop starts*/
outfile.close();//close it!!!
ofstream preading;//set up stream (preading)
outfile.open("C:\\preading.txt",ios::trunc);/*clear existing file*/
outfile.close();//close it!!!
rcount=0;//
riser1=0;//re-setting
riser2=0;//
for(count=0;count<12;count++)/*setting counter for loop (12 months)*/
{//begin for loop1
cout<<"Enter the voltage reading: <"<<voltage<<"> ";//prompt for input
/*this allows the user to accept the default (last voltage reading entered)*/
//simply by pressing RETURN!!
cin.getline(buff,100);
if (strlen(buff)==0)//if nothing is entered (return pressed)
{
voltage=voltage;//voltage is not changed
}//end if
else
{
voltage=atof(buff);//else voltage equals user input
}//end else
//convert voltage to pressure
pressure=((voltage*20)+500);
/****************/
//write this to a file
outfile.open("C:\\preading.txt",ios::app);/*open to append*/
outfile<<pressure<<endl;//remembering to change line
outfile.close();//close it!!!
//check pressure readings
if(pressure>=700)/*if equal to or greater than print this to screen*/
{
cout<<"\n\..........************* WARNING THE PRESSURE IS ABOVE RECOMENDED LEVELS!****************"<<endl;
}
riser2=pressure;//set riser2 to pressure,
if(riser2>riser1)/*now if riser2 is greater than riser1*/
{
rcount++;/*add one to the counter (keeping count of consecutively rising readings)*/
}//end if
else
{
rcount=1;/*else reset counter to one*/
}
if(rcount>=4)/*if counter is egreater than or equal to 4 (consecutively risen readings)*/
{
cout<<"\n\..........*********** WARNING! THE LAST "<<rcount<<" ENTRIES HAVE RISEN CONSECUTIVELY ************\n";//alert
/*the user to how many consecutive rises there has been*/
}//end if
/******************** store reading ************************/
//target stream (outfile) to a text file (pressure.txt)
//then open it ready to APPEND data
outfile.open("C:\\pressure.txt",ios::app);/*open to append*/
//send data
if(pressure>=700)/*if pressure is >= 700 print asterix's as warning in file*/
{
outfile<<"***"<<pressure<<"***"<<endl;
}//end if
else//otherwise just print the pressure
{
outfile<<pressure<<endl;/*remembering to change line*/
}//end if
cout<<endl<<"file written\n";/*inform the user the file has been written*/
outfile.close();//close file
/********************************/
riser1=riser2;/*set riser1 equal to riser2 (helps keep track of the consecutive readings)*/
cout<<"temp print out of pressure "<<pressure<<endl<<endl;/*print the pressure reading to the screen*/
}//end for loop1
/***************************************/
cout<<setiosflags(ios::left)<<setw(12)<<"READING"< <setw(12)<<"PRESSURE"<<endl<<endl;
for(index=0;index<12;index++)
{//begin loop2
cout<<setw(12)<<index+1<<setw(18)<<index2<<endl;
}//end loop
cout<<endl;
}//end main
