[glenn16]

inside the infile.txt:
Adobo
Carbohydrates
Meal
Philippines
Very_good
9

i need to delete all 6 info in the text file. but my code can only delete one line.

    	char deleteline[50], a[20];
	string line;
	ifstream sup;
    sup.open("infile.txt");
    ofstream temp;
    temp.open("myfile.txt");
	information lists;
    cout << "What INFORMATION do you want to remove? ";
    cin >> deleteline;
	

	
    while (getline(sup, line))
    {
		for (int x = 1; deleteline[x] != '\0'; x++)
	{
        if (line != deleteline)
		{
			temp << line << endl;
			cout << "Information(s) was succesfully deleted." << endl;
						
		}
       	else 
			cout << "Information(s) was not found." << endl;
		
    }
	}
	

    temp.close();
    sup.close();
    remove("infile.txt");
    rename("myfile.txt","infile.txt");

[CTphpnwb]

Your code only compares against the first item in deleteline.

You're comparing a C string (deleteline) to a C++ string (line). Use one or the other.

[Skydiver]

Also be careful with your for loop condition on line 15. If the very first line you read from the file is a blank line, and you are unlucky enough that the random data in the deleteline array does not contain any zeroes, then you will quickly read data beyond the array range.

I don't think you even need that for loop, but you may have your own reasons for having it. It's just not obvious why, though.