C++ :: File Operations Inputting A File Into Program
Jul 28, 2014
I keep getting this error when trying to compile.
error C2440: 'initializing' : cannot convert from 'void' to 'std::basic_ifstream<_Elem,_Traits>'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> Expressions of type void cannot be converted to other types
I have to write this program that is to store the name, address, id number, etc of a student. The data is supposed to be brought in through main and there will be multiple students. I'm not sure what commands I should use to bring it in.
EDIT: This will make more sense. In the .txt file the info will be written like
Name Last name Address etc.
I need to input that and use that for the appropriate number of students.
using namespace std; const int SIZE = 40; const int COLUMN = 5; void getData(ifstream& inf, string n[], double tstData[][COLUMN], int count);
[Code] .....
when I compile and run the code and have it display it does not read the first item into the 1-d array, instead it appears to read the 4th number from the left into the 1-d array and then into the second spot in the 2-d array, then again in its proper place and finally it has this number repeating through the rest of the arrays:
-92559631349317830000000000000000000000000000000000000000000.00 followed by the number 59.7 from the .txt and the long number again.
Why the placement of the code on line 21 above matters.
It grabs the correct string just fine. If I write a printf just below it, it prints the string it should correctly. However, if I do a printf of the string OSUteamCode below the fopen call on line 23, it prints blank.
So the first thing I did was move it below the fopen line. It worked, finding and outputting the first game in "game.csv" just fine, but not the other 11. Debugging with printf shows that the contents of OSUteamCode again disappear after the fopen call in the addLineCSV function.
I'm not understanding why that happens. The only thing I can figure is there's something going on with the file I/O commands that I just don't understand, but I can't find anything online that explains what that might be.
I am a beginner trying to write a program that would state a user's chinese zodiac and horoscope sign after inputing his or her birthday. I have been, however, having trouble getting the program to run correctly.
I've been assigned to build a program which completes mathematical operations using matrices. I have to use dynamically allocated 2d arrays, and can only use * to dereference and not []. I have this code so far, but the multiply_matrix function does not work with most values. I've looked at other similar posts, which have a similar algorithm to mine, but mine does not work for some reason.
/* *(*matrix(matrix+i)+j) */
#include <iostream> //for sleep() which allows user to see messages before screen is cleared #include <unistd.h> using namespace std;
One of my class assignments is to create a program that receive a .txt file containing a students name and their grades as follows:
John K. 99, 87, 57, 89, 90, 95 Amanda B. Jones 100, 88, 76, 99, 86, 92 etc..
The number of students is unknown until run time. You have to take those grades and average them weighing the first (4) at 10% a piece and the last (2) at 30% each.
Then return an output file with the students name and their letter grade A,B,C,D,F based on their computed score. In addition, on screen it needs to display the average scores for each Q1, Q2, etc. as well as the minimum and maximum for each test on the screen. I am having a hard time in assigning the scores to a variable so that they can then be computed as an average and then used to determine a letter grade. I have begun to write the code and am a bit stuck..here's what I have so far:
and then use that information to determine their letter grade and write that information to a .txt file. I have been able to successfully pass that information to a function to determine their letter grade and have been able to successfully compute their letter grade. However, I can get this information to successfully post within the *computeGrade () function. Yet, I don't know how to pass this information back to the main() on a student by student basis so that I can open a new .txt file and write just their name and letter grade to it.
Another issue I'm having is when it comes to computing the averages of the class. Each score is either a quiz (there are 4), a midterm (there are 2) or a final (there is 1). I'm a little stuck on how to pass say all of the quiz 1 grades as one entity to the function averagesminmax(). Is there a way to compile each of the grades for a specific quiz or midterm as one array and pass that to the function to then do the computation. Also we need the min and max so again from compiling the grades of a particular quiz or exam together as one.
Here's the code that I have so far.
#include <stdio.h> #include <stdlib.h> #include <math.h> const char *computeGrade(); int averagesminmax(); int main() { char fName[20]; char lName[20];
[code]....
Do I need to re-read the input file and assign them to different variables?
Here's a sample of the output so far:
Enter input .txt file name Graded Thui Bhu, 91, A Ariana B. Smith, 96, A Emily Gonzales, 83, B Jennifer L, 89, B Maria Jones, 67, D Bill Gates, 55, F Escobar Morris, 78, C Anne Latner, 88, B Program ended with exit code: 0
Also in my output file, the only thing that it prints will be the first name of whatever the last student in the input file list is.
I'm trying to make a program that you input your login info and it writes that info to a text file. Then, later on once I get my problem fixed, the program will read the info to the user. my code is as follows(the input part is a bit lengthy):
it skips the input phase,, instead of inputting the last name it goes directly to the firstname then middle initail and street name are working fine but it skips the street name then goes to city and so on....
Code:
char l[50], f[50], m;char strtname[50], cty[50], cntry[50]; int strtnum, zp, i; system("cls"); printf("Enter Last name:"); gets(l); printf(" Enter First name:"); }
So I have a two-dimensional array named temperatures[7][2] and I am trying to promt the user to input the highest temperatures for a 7 day period in the first column and the lowest temperatures in the second column. So far all I am getting when I test my code is the temperatures in the second column.
/*Intermediate23.cpp - This program inputs the highest and lowest temps. for seven days. It then displays the average high and low temps. and also diplays the highest temp. that's stored in the first column of the array and displays the lowest temp. stored in the second column of the array.*/
#include <iostream> #include <iomanip> using namespace std; int main() { //Declare array and variable int temperatures[7][2] = {0}; int avg = 0; int totalTemp = 0;
I'm very new to MFC & VisualC++. I'm using MSVS2010 Pro. I am trying to write/debug a simple form that saves and restores the content of some edit controls. It seems to work as expected, except the file saves only to the Project Folder, regardless of where I browse and select to save the file.
Code: void CMFC_FileDialogDlg::OnBnClickedbtnsave() { this->UpdateData(); CFile f; //Kinda Correct, Works but still saves in Project Folder BOOL b_OpenFileDialog = FALSE;//this doesn't act as bool in CFileDialog?
[Code] ....
My only experience is a little simple VB programming in Excel, so any specific examples??? Also, rules seem to change from version to version? I have to "update" a number of undocumented programs.
so my homework assignment is to make a program of which removes any notes in a program file.
for example, you run my program it will ask for a filename, when entered it opens the file, copies everything in it and removes any double forward slashes (//) and anything after that up to the new line character ( ) and anything between /* and */ including the /* and */.
i created the entire program and it removed the // and anything after that up to the new line character but will not remove anything after the first / when it finds a /*. This includes the */ at the end of the comment.
the section of code that removes the comments is
//this loop removes all notes for(i=0;i<buf.st_size;i++) { if((filecontent[i]=='/')&&(filecontent[i+1]=='/'))//removes notes using // { for(i=i;filecontent[i]!=' ';i++) filecontent[i]=' ';}
[Code]....
i know that the section that removes the multi line comments would not remove the final */ at the end if it did work, i was planning to fix that later once it removed the comment.
The app just blocks. Could it be due to a lack of RAM (since its inside a massive loop and I'm currently using an old-ass pc with 1GB RAM) or is it bad programming? If I remove that line everything runs smoothly.
I am doing a data structures program on C++ that is suposse to consist of declaring an array of size five for my credit card structure, that allows the user to input information of five diferent credit cards. I am having a problem with my program, because it runs but after I input the information of the credit card, it does not print out the values that I had input.I dont know where I went wrong with the code or if it is that my approach to solving it is wrong. My code is the following:
here's one more thing id like to do to make the input even better able to handle user error, but im not sure if its possible or at least easy. I need the function to return a large positive number. As of right now, it can handle users entering characters, but what if the user enters a negative number? is there a way to check to see if what is coming in is negative before the sign gets lost in conversion to unsigned"ness"?
Code: unsigned long getNum(char prompt[80]) { unsigned long darts; printf("%s", prompt); while((scanf("%lu", &darts)) != 1) { [code]....
I want to create a program that would take an AVI file, alter each frame (ex: change contrast, invert colors, etc.) and dump a new AVI. I've wrote a simple program for this experiment that loads up the header information from the video and dumps it. It also dumps a list of the frame data chunks within the 'movi' chunk.
The info I've gathered from coding this:
1. The recommended buffer size for each type of stream (vids, auds, etc.) is the size of the largest frame of corresponding type, plus 1 or two extra bytes.
2. numFrames in main header is the total number of frames for all types of data (video,audio,etc.) The 'length' value within stream header of type 'vids' is the number of video frames. The sizeImage value within BITMAPINFOHEADER is 921600 (==640*480*3) and the specification states that, quoth, "This can be set to 0 for uncompressed RGB bitmaps."
3. This video uses DIVX encoding.
Now my problem is this: How do I get the data within each video frame in a simple BMP like format? Even the uncompressed frames (with chunk id 'nndb') have variable sizes...let alone the compressed ones.
Information about a software that converts AVIs to a format with fixed sized uncompressed frames. Or at least some information about the frame decompression techniques.
Here's a dump made by the program for a 9 sec, 640x480 video I recorded from Pokemon. (Without the frame dump that is, it'd have made the post too long.)
