Reading an Int From a File C++

Howdy. I'm completely new to programming and I have a question near a programme I have to write.

I need to read some numbers from a file and display the sum of the numbers > 0, count of the numbers > 0, sum of the number < 0, count of the numbers < 0, and a count of the numbers == 0.

I'm completely stuck on how I should write the while loops. Hell, how I should write anything. I recall I may have the beginning correct. This is my measly attempt:

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#include <iostream> #include <fstream> using namespace std; int primary() { ifstream inFile; int value1, value2, value3, value4; int sum; int count = 0; inFile.open up("My_Path"); inFile >> value1, value2, value3, value4; inFile.shut(); sum = value1 + value2 + value3 + value4; while ( sum > 0 ) { cout << "Sum of #'s > 0 : "; sum += value; count++; } return 0; }

inFile >> value1, value2, value3, value4;

should be

inFile >> value1 >> value2 >> value3 >> value4;

assuming that each of the values are separated by a whitespace.

Yep, didn't catch that typo. My principal confusion lies with how would I become the counts and sums.

Should I be using a for loop or a while loop? Can someone at least signal me in that direction? I'yard currently accept

for (int value = 0; value > 0; count++)

Is that wrong?

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I idea I was on the right rail for this, but the output displayed an endless amount of sixes.

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#include <iostream> #include <fstream> using namespace std; int main() { ifstream inFile; int value; inFile.open up("My_Path.txt"); if (!inFile) { cout << "\nError opening file.\northward"; return 13; } while (inFile >> value) { while (value > 0) { cout << value; } } inFile.close(); render 0; }

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@Guy1988

For line 19, endeavor if (value > 0)

I'm thinking that te start number read in with the infile, was a vi. So, since value never decreases and become less than 0, you lot enter an endless loop, always displaying the offset number, which was a 6;

Yep, that'south what I ended upward doing. Would I nest the other if statements inside? To add the counts for each if argument, do I add count++ inside each one?

If it helps, the numbers in my file are -nine, 6, 0, and iv.

@Guy1988

You seem to exist referring to your original post code, as there is no count, or other if statement, in it. Seems the above program was just a test to go things figured out..

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#include <iostream> #include <fstream> using namespace std; int primary() { ifstream inFile; int value; int sum = 0; // Initialize to 0; int count = 0;// aforementioned as higher up inFile.open("My_Path.txt"); while(inFile >> value) // While file can be read in ( You can increase numbers in text { count++; // Increase count cout << "Sum of #'due south > " << count; // Print out variable sum += value; // Increase sum total } inFile.shut(); // Close file. cout << "Sum full of all " << count << " numbers, was "<< sum << endl; // Print out the results return 0; }

If it helps, the numbers in my file are -nine, half-dozen, 0, and four.

Yep. Get-go number that was greater than 0 is the 6. Line 19 disregarded the -nine, since it was not greater than 0

My first post was me completely lost with what to exercise. I and then thought I had to nest while loops.

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while(inFile >> value) // While file can be read in ( You can increase numbers in text { count++; // Increase count cout << "Sum of #'south > " << count; // Impress out variable sum += value; // Increment sum total }

This is what I'1000 stuck on. How exercise I get the multiple values read and display each count and sum for >, <, and then display the count for == 0.

This is what I have at present:

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inFile >> value; while (inFile) { if (value > 0) { count++; } else if (value < 0) { count++; } else { count++; } }

How do I display separate counts and sums for each of the branched if statements?

You need to have 3 sum variables and 3 count variables and test equally each new number is read in:

one. setup variables count_of_negative_numbers, sum_of_ngative numbers, count_of_positive_numbers etc etc
2. read a new number called new_number
3. if new_number < 0
then increment count-of_negative_numbers and add new_number to sum_of_negative numbers

4. if new_number == 0 ... same process
five. do the same for new_number > 0 ...
...

6. loop back to become a new new_number

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This is so frustrating for me, I'm not understanding.

What do I read a new number for? Everything that needs to be read is in the file. What I have to exercise is display the sums and counts for those numbers.

I've got something that looks like this now.

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#include <iostream> #include <fstream> using namespace std; int main() { ifstream inFile; int countn = 0, countp = 0, countz = 0; int value; int sumn, sump, sumz, sum; inFile.open("My_Path.txt"); inFile >> value; while (inFile) { if (value > 0) { sum += sump; countp++; } else if (value < 0) { countn++; } else { countz++; } } inFile.shut(); cout << "Sum of #'s > 0: " << countp; return 0; }

At present, when I execute, zero is displayed.

What is the contents of the file "My_Path.txt"?

The numbers I listed: -nine, 6, 0, and 4 in Notepad.

I made certain the file opened first, before I did anything else, and information technology processed.

I'm getting no output displayed when executing. What'south going on?

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#include <iostream> #include <fstream> using namespace std; int primary() { ifstream inFile; int countn, countp, countz; int value; int sump, sumn, sumz; inFile.open("My_Path.txt"); if (!inFile) { cout << "error"; render xiii; } inFile >> value; while (inFile) { if (value > 0) { countp++; sump += value; } else if (value < 0) { countn++; sumn += value; } else { countz++; sumz += value; } } inFile.close(); cout << "Sum of #'s > 0: " << sump; cout << "Count of the #'s > 0: " << countp; cout << "Sum of the #'south < 0: " << sumn; cout << "Count of the #'south < 0: " << countn; cout << "Count of the #'s = 0: " << countz; return 0; }

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else { countz++; sumz += value; } }

Should be :

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else { countz++; sumz += value; } inFile >> value; }

At that place is an space loop. The plan never finishes. It gets stuck in the while loop at line 21.

I was getting help from someone and at present I'm getting crazy big numbers in my output.

And then is my whole construction incorrect?

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Source: https://www.cplusplus.com/forum/general/198475/