simple graphics output

Hi all,
If, for example, I have solved a differential equation with some algorithm (say Euler's method) and want to show the resulting curve in a graphics window. Is there a simple way to do this? Do I have to install the SFML library for this? Thanks in advance for some enlightening answers.
H A
If you just want to look at the shape of your output without having to develop a graphical application you could just write out the data as tab separated values (or similar) and read into a spreadsheet or use gnuplot or similar.

For a more rapid turn-around than using a spreadsheet you could have the program output gnuplot commands and then pipe it straight into gnuplot - something like that
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