Is there a way to zoom in and out (dynamically change the font size, quite smoothly) on emacs?
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Try C-x C-+ and C-x C--; that is, Control–x Control–Minus/Control–Plus.
After one combination (C-x C-+ or C-x C--), successives + or - increase or decrease the text scale without typing C-x C- again.
Addition by sawa
I looked up the function that was assigned to the keys mentioned, and found out that they are
text-scale-increaseandtext-scale-decrease. I added the following to my configuration file so that I can do Ctrl+Scroll to zoom in/out. It is useful.