#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: }
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