reading data contents from files in c++

Hello there. Well im stuck with a problem of how to extract data from a given data file. i have to read line by line. for example:

this line contains numbers(int):
2 3 4 5 6

i have to read each of these and assign each to a variable that i"ll be able to calculate the sum.


another line:conataining floating pt numbers. same thing to do here.

and lastly of how to concatenate some characters to form a string, the characters will be read from the data file.

Any suggestion plz... :)

In its most simple form:

Code:

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int Var1;
int Var2;
float Var3;
float var4;

std::ifstream File("SomeFile.txt");

File >> Var1 >> Var2 >> Var3 >> Var4;

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That could work..

yea.. this is fine... but i have those integers, floating points and characters on separate lines in a single file.. how do i proceed then??? :(

Quote:

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...on separate lines in a single file...

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Doesn't matter. By default ifstream delimits on spaces, newlines, and tabs - meaning a new line is like a space to ifstream. Therefore, what Magos suggested would work.

Quote:

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and lastly of how to concatenate some characters to form a string, the characters will be read from the data file.

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What kind of string? C-string or std::string? C-strings are just char arrays (but remember to tack on a '\0' to the end). As for std::string, it has a push_back() function.
http://www.cppreference.com/cppstring/push_back.html