Help with reading from file

[Muly]

Here is file:

meal.dat \\ I have create the file using Sources Files (visual studio)
B 100
E 515
S 45
D 520

and here is the code

#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int main()
{
ifstream Meal;
char Type;

int Callories;

Meal.open("Meal.dat");
Meal>> Type >> Callories;
cout<< "Type" << Type <<endl;
Meal.close();



return 0;
}

Here is the output screen:
TypeB

My question is : how can I read all the lines and add them up (Sum); Thank you

[detroit]

Try a while loop.

Hint: read until the end of file, once end of file exit the loop

// here is an example to point you in the right direction

// include statments

int main()
{
ifstream in;// to acces the file with the data information

char ch; // to get the letter
int i = 0; // to eat the calories
int sum = 0; // total calories


in.open("filename");

// check if the file is open
// if not print a message that say id did not open

// if file opened
// while loop

while (!in.eof()) // this will run until it reaches the end of file
{
     // read the charachter;
     // read the calories;

     in.ignore(100, '\n'); // this is to ignore everything after the calories all the way to new line

     // add the calories to sum 

}

// output the sum
return 0;



}

this is all you should need, so put an effort and if you get stuck or have errors post the effort and someone will help you.

[Muly]

How can I call the second and the third line from the File ??

[whitenite1]

@Muly

Here is your program that first asks which entry to show, prints it along with total calorie count, then shows the list as a whole, with the sum of all the calories.
I made meal.dat larger. Added also. as first entry, how many entries there are.

15
A 100
B 515
C 45
D 520
E 128
F 421
G 79
H 170
I 625
J 99
K 395
L 135
M 466
N 649
O 199

// Meals.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int main()
{
	ifstream Meal;
	char Type;
	int x = 0;
	int sum = 0;
	int entries = 0;
	int Calories = 0;
	int entry = 0;

	Meal.open("Meals.dat");
	Meal >> entries;

	do
	{
		cout << "Which entry do you wish to see? ( 1 to " << entries << " ) ";
		cin >> entry;
		if (entry <=0 || entry >entries)
			cout << "No entry in that slot.." << endl;
	} while (entry <=0 || entry > entries );


	for ( x=0; x < entry; x++)
	{
		Meal >> Type >> Calories;
	}
	sum = Calories;
	cout << endl << "Type : " << Type << "  Calories : " << Calories << " Sum of calories = " << sum << endl << endl;
	Meal.close();	

	cout << "The list of entries are : " << endl << endl;

	Meal.open("Meals.dat");
	entry = 1;
	sum = 0;
	Meal >> entries;
	while (Meal)
	{
		Meal >> Type >> Calories;
		if (Meal)	
		{
			cout << "Entry # ";
			if (entry < 10 )
				cout << " ";
		cout << entry << " : Type : " << Type << "  Calories : ";
		
		if ( Calories < 10)
			cout << " ";
		if ( Calories < 100 )
			cout << " ";
		cout << Calories << endl;
		sum +=Calories;
		entry++;
		}
	}
	cout << endl << "Total Calories of the " << entries << " entries is : " << sum << "." << endl << endl;
	
	Meal.close();
	return 0;
}