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rawlings12345
c++ fstream problems?
For some reason, the void function named "senddata()" is unable to open my excel document, even though the document was opened and closed previously by another function "getdata()". Here's a chopped up version of my program:
const int columns = 4;
const int infosize = 20;
const int rows = 200;
char initial[1][1][10000];
char soldier[rows][columns][infosize];
void main()
{
getdata();
mainscreen();
senddata();
}
void getdata()
{
excel.open("example.csv", ios::in | ios::binary);
if (!excel)
cout << "ERROR: Cannot open file.\n";
excel.read(reinterpret_cast<char *>(initial), sizeof(initial));
[random coding]
}
void mainscreen()
{
[random coding]
}
void senddata()
{
excel.open("example.csv", ios::out | ios::app);
if (!excel)
cout << "ERROR: Cannot open file.\n";
excel.write(reinterpret_cast<char *>(soldier), sizeof(soldier));
_getch();
excel.close();
I threw in the _getch() in the senddata() function to see what was going on, and that's where I can see the (!excel) expression catching and giving me the output I specified. I just don't understand why it can't open the file. I mean, it opens the file just fine in the first function. I close it properly. Yet it just won't open in the other function. Any ideas??? Much appreciated.
1 AnswerProgramming & Design1 decade agoWhere did C go?!?
Take the equation below, trace the steps, and tell me what happened to variable C.
A = B + C (multiply both sides by (A - B))
A(A - B) = (A - B)(B + C) (multiply this out)
A^2 - AB = AB + AC - B^2 - BC (now subtract AC from both sides)
A^2 - AB - AC = AB - B^2 - BC (now simply each side by factoring)
A(A - B - C) = B(A - B - C) (now divide both sides by (A - B - C)
A = B (what happened to C?! My original equation stated that A = B + C, not that A = B. Where did C go?)
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