Can't get my program to ignore blank lines.

[laxmang4]

I'm trying to write a program that creates webpages by reading text from a file. I can't seem to get the program to ignore lines that only contain the "\n" or "\t".

Here is the main section of code.

int main()
{
string sarray[6];
int counter=0;
ifstream infile;
ofstream outfile;
//string filename; filename.c_str()
string temp;
infile.open("from_excel.txt", ios::in);
outfile.open("output.htm",ios::out);

while(getline(infile,temp))
{
counter=0;
cout<<"Main Counter = "<<counter<<"!!!\n\n";
while((temp!="\n") || (temp!=" ") ||(temp!="\t"))
{
cout<<"counter = "<<counter<<endl;
cout<<"temp = "<<temp<<endl;
sarray[counter]=temp;
counter++;
getline(infile,temp);
}
cout<<"22222 Main Counter = "<<counter<<"\n\n";
create_page(counter,sarray,outfile);
}
infile.close();
outfile.close();

return 0;
}

The way this should work is if temp is a newline, space or tab it shouldn't go into the while loop but it has been regardless of what is on the line.
Any help is greatly appreciated.

PS. The cout statements were for error testing purposes.

[scruggsy]

while((temp!="\n") || (temp!=" ") ||(temp!="\t"))

Look at this condition. Consider the case where temp == '\n':

while ("\n" != "\n" || "\n" != " " || "\n" != "\t")

|| means OR. "\n" != "\n" returns false, but "\n" != " " returns true, thus the expression evaluates to true, thus execution enters the loop.
Use && instead of ||.

[xoinki]

hi,
I can think of 2 reasons:
1) Either you need to check for character '\n' instead of String "\n"
2) In widows carriage return is '\r\n' and In linux it is '\n' and in MAC it is '\r' If I correctly remember. My suggestion would be to put a condition that include '\r\n'.

Thnks and Regards,
Xoinki

[laxmang4]

Look at this condition. Consider the case where temp == '\n':

while ("\n" != "\n" || "\n" != " " || "\n" != "\t")

|| means OR. "\n" != "\n" returns false, but "\n" != " " returns true, thus the expression evaluates to true, thus execution enters the loop.
Use && instead of ||.

I tried replacing with && but that didn't work. In addition to that problem, My program is randomly not reading lines from the file.
Do I need to somehow clear any of the i/o streams?

[laxmang4]

I tried replacing with && but that didn't work. In addition to that problem, My program is randomly not reading lines from the file.
Do I need to somehow clear any of the i/o streams?

Ok so I fixed the not reading in lines issue, but it still doesn't recognize the lines that only contain newlines or tabs. Am I comparing them correctly?

[weaknessforcats]

I believe you need to find the string size. If it's 1 and string[0] is equal to '\n' or '\t', then you should have your guy.