#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>
#include <math.h>
#include <conio.h>
#include <string.h>
fstream file;
char year[5]="";
//Non-Member function to find month, to avoid user data-entrychar *returnMonth(int m){
switch(m){
case 1 : return("January");
case 2 : return("February");
case 3 : return("March");
case 4 : return("April");
case 5 : return("May");
case 6 : return("June");
case 7 : return("July");
case 8 : return("August");
case 9 : return("September");
case 10 : return("October");
case 11 : return("November");
case 12 : return("December");
}
return("Invalid");
}
//Non-Member functions, checks for whether file is loaded or not//it returns 1 if not loaded and 0 otherwise.int checkFile(){
if(file==NULL){
cout<<"\nThere is No Data to Display\n";
getch();
return(1);
}
return(0);
}
class weather
{
public:
double avgtemp[12];
char month[12][20];
weather();
void getdata(int m){ //simple getdata...
strcpy(month[m],returnMonth(m)); //avoiding user to input
cout<<"\nEnter temperature for "<<month[m]<<" : ?\b";
cin>>avgtemp[m];
}
void displaydata(int m){ //simple displaydata
cout<<setw(20)<<setprecision(2)<<setiosflags(ios::left)
<<setiosflags(ios::showpoint)
<<month[m]<<setw(10)<<setiosflags(ios::right)<<avgtemp[m];
}
void displaytemp(int i){ //Display only Temperature data
cout<<setw(10)<<setprecision(2)<<setiosflags(ios::right)
<<setiosflags(ios::showpoint)<<avgtemp[i];
}
double returntemp(int i){
return(avgtemp[i]);
}
void loadfile();
void displaytempscale(); //for displaying temperature scalevoid updatedata(int m,double t)
{
strcpy(month[m],returnMonth(m));
avgtemp[m]=t;
}
int validate(double t){ //Validate entered temperature (change to suit ur requirement).if(t>55 || t < (-20))
return(1); //states that invalid entryelsereturn(0); //valid entry
}
};
weather :: weather(){ //Constructor to intialize objectfor(int i=0;i<12;i++)
{
avgtemp[i]=0;
month[i][0]=NULL;
}
}
void weather :: loadfile(){ //for Selecting Year or creation of new year file.
clrscr();
file.close(); //It is required when trying to open different year files,//while there is already loaded any year file.char filename[20]="";
cout<<"\n*****Select a Year to Work With*****\n\n";
cout<<"Enter Year (eg: 2001) : ?\b";
cin>>year;
strcat(filename,"c:\\"); //Here i am assuming that path must be c:\
strcat(filename,"data"); //if u wan't to skip that criteria just remove this lines.
strcat(filename,year);
strcat(filename,".dat");
file.open(filename,ios::ate|ios::nocreate|ios::in|ios::out|ios::binary);
if(file==NULL){
char ans;
cout<<"\nFile Dose Not Exist\n"
<<"Do you wan't to create it! (y or n) N : ?\b"; //By default No
ans=getche();
if(ans=='y'|| ans=='Y'){
file.open(filename,ios::ate|ios::in|ios::out|ios::binary);
cout<<"\n\nFile Created Successfully";
}
else{
file;
cout<<"\n\nFail to load data file";
}
}
else if(file!=NULL){
cout<<"\nData File is successfully loaded";
}
getch();
}
void weather :: displaytempscale(){
int i,c=0;
cout<<"\n\n";
for(i=1;i<=70;i++)
{
if(i<=10)
cout<<"0";
else if(i<=20)
cout<<"1";
else if(i<=30)
cout<<"2";
else if(i<=40)
cout<<"3";
else if(i<=50)
cout<<"4";
else if(i<=60)
cout<<"5";
else if(i<=70)
cout<<"7";
}
cout<<"\n";
for(i=1;i<=7;i++)
{
for(c=0;c<10;c++)
cout<<c;
}
cout<<"\n";
}
void intro()
{
clrscr();
cout<<"\n\n\n\n\n\n\n\n\t\t\t";
cout<<"\t\t\tEmail : admin@syntax-example.com\n"
<<"\t\t\tWebsite : http://www.syntax-example.com";
cout<<"\n\n\t\t\t";
cout<<"Thanks for using this software.";
getch();
}
void main(){
char choice='1';
int cnt,i,j,iNum,totstars=0,location,m;
double decNum,dNum,high=0,low=99999,avg=0,t;
char c;
weather obj;
file.close();
do{
clrscr();
cout<<"\n*****Main Menu*****\n";
cout<<"1> Select a year to work with\n"
<<"2> Display data as Table\n"
<<"3> Display data as horizontal histogram\n"
<<"4> Display Yearly Statistics to date\n"
<<"5> Record Data\n"
<<"6> Change Data\n"
<<"7> Save Data\n"
<<"0> Exit\n"
<<"Please enter a number (0...7) => ";
choice=getche();
//again for sake of simplicity i have directly return code
//in case brace rather than going for member-function.
switch(choice){
case '0' : intro();
goto out;
case '1' : obj.loadfile();
break;
case '2' : clrscr();
cout<<"\n*****Display Data as a Table*****\n\n";
if(checkFile()){
goto endtable;
}
cout<<"\nTable of Temperature data for "<<year;
cout<<"\n\n";
file.seekg(0,ios::end);
cnt=file.tellg();
cnt=cnt/sizeof(obj); //cnt contains how many records previously recorded
file.seekg(0,ios::beg);
for(i=1;i<=cnt;i++)
{
if(i==1)
cout<<"\nQuater 1 : ";
else if(i==4)
cout<<"\nQuater 2 : ";
else if(i==7)
cout<<"\nQuater 3 : ";
else if(i==10)
cout<<"\nQuater 4 : ";
file.read((char *)&obj, sizeof(obj));
if(!file.eof()){
obj.displaytemp(i);
}
file.clear();
}
getch();
endtable:
break;
case '3' : clrscr();
cout<<"\n*****Display Data as a Horizontal Histogram*****\n\n";
if(checkFile()){
goto endhistogram;
}
cout<<"Histogram of Temperature data for "<<year;
obj.displaytempscale();
file.seekg(0,ios::end);
cnt=file.tellg();
cnt=cnt/sizeof(obj); //cnt contains how many records previously recorded
file.seekg(0,ios::beg);
for(i=1;i<=cnt;i++)
{
cout<<"\n"<<setw(15)<<setiosflags(ios::left)<<returnMonth(i);
file.read((char *)&obj, sizeof(obj));
if(!file.eof()){
decNum=obj.returntemp(i);
iNum=floor(decNum);
dNum=decNum-iNum; //for finding decimal part.
totstars=iNum;
if(dNum >= 0.5)
totstars++;
for(j=1;j<=totstars;j++)
cout<<"*";
cout<<" "<<totstars;
}
file.clear();
}
obj.displaytempscale();
getch();
endhistogram:
break;
case '4' : clrscr();
cout<<"\n*****Display Yearly Statistics to Date*****\n\n";
if(checkFile()){
goto endstatus;
}
cout<<"Temperature Statistics data for "<<year;
cnt=file.tellg();
cnt=cnt/sizeof(obj); //cnt contains how many records previously recorded
file.seekg(0,ios::beg);
high=avg=0;
low=99999;
for(i=1;i<=cnt;i++)
{
file.read((char *)&obj, sizeof(obj));
double tmp=obj.returntemp(i);
if(!file.eof()){
if(high < tmp)
high=tmp;
if(low > tmp)
low=tmp;
avg=avg+tmp;
}
file.clear();
}
avg=avg/double(cnt);
cout<<"\n\nHighest Monthly Average : "<<high;
cout<<"\nLowest Monthly Average : "<<low;
cout<<"\nAverage Yearly Temperature : "<<avg;
getch();
endstatus:
break;
case '5' : clrscr();
cout<<"\n*****Record Data*****\n\n";
if(checkFile()){
goto endRecord;
}
else{
cnt=file.tellg();
cnt=cnt/sizeof(obj); //cnt contains how many records previously recorded
if(cnt==12)
cout<<"\n\nData-Entry of "<<year<<" is already been done\n";
for(i=cnt+1;i<=12;i++)
{
enteragain:
cout<<"\nDo u wan't to enter data for"<<returnMonth(i)<<" (Y or N) Y : ?\b";
c=getche();
if(c=='n' || c=='N')
goto endRecord;
obj.getdata(i);
if(obj.validate(obj.returntemp(i)))
{
cout<<"\nInvalid Data Entry\n";
goto enteragain;
}
cin.get(c);
file.write((char *) &obj, sizeof(obj));
}
}
getch();
endRecord:
break;
case '6' : clrscr();
cout<<"\n*****Change Data*****\n\n";
if(checkFile()){
goto endchange;
}
else{
cnt=file.tellg();
cnt=cnt/sizeof(obj); //cnt contains how many records previously recorded
tryagain:
cout<<"\nEnter Month (in digit) whose temperature is to be changed : ?\b";
cin>>m;
if(m <= 0 || m > cnt){
cout<<"\n\nInvalid Month\n";
getch();
goto tryagain;
}
tempagain:
cout<<"\nEnter Temperature : ?\b";
cin>>t;
if(obj.validate(t))
{
cout<<"\nInvalid Data Entry\n";
goto tempagain;
}
file.seekg(0,ios::beg);
location= (m-1) * sizeof(obj);
file.seekp(location);
obj.updatedata(m,t);
cin.get(c);
file.write((char *) &obj, sizeof(obj))<<flush;
}
endchange:
break;
case '7' : clrscr();
cout<<"\n*****Store the Current Data*****\n\n";
if(checkFile()){
goto endsave;
}
flush(file);
cout<<"\nData in Memory is Saved successfully\n";
getch();
endsave:
break;
default : cout<<"\n\nInvalid Input\n";
getch();
}
}while(choice!='0');
flush(file);
file.close();
clrscr();
out:
}