devxlogo

Output Never Gets to Printer — Why?

Output Never Gets to Printer — Why?

Question:
When I run the following program:

#include main(){fstream printer1;printer1.open(“prn”, ios::out);printer1 << "Hello World";}
the output never makes it to the printer. What am I doing wrong?

Answer:
When it comes to external devices like printers, etc., there could be a dozenproblems that prevent it from printing.

Assuming that on your platform there is a predefined file called “prn” thatwill cause output to your printer, assuming that is true and alsoassuming that your printer is connected correctly and configured well,the only reason I can think of is that the stream implementation is buffered and requires an explicit flush to work (see example below).

Also, make sure that the program is not creating a file under the currentdirectory named “prn”; if this is so, your platform does not treat thefilename “prn” in any special way.

#include main(){	fstream printer1;	printer1.open(“prn”, ios::out);	printer1 << "Hello World" << flush;}
Hope that helps.

See also  Using Consumer Trust to Help Build Brands On Major Social Platforms
devxblackblue

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist