Your program is being a CPU hog! In some cases, this situation can actually make your program run slowly! Your code needs to give some time back to the OS (i.e. delay or sleep). Use SDL_Delay(Uint32), where the Uint32 is in milliseconds. As a quick fix, you can toss a SDL_Delay(1) call into your loop. That will give up some amount of time, based on the OS and the resolution of SDL_Delay(), which is somewhere around 10ms. If you need better resolution than that, you have to store the time it takes to perform SDL_Delay(1), check that against delay calls, and then burn the rest of the time in an empty loop. Here's a link to some code implementing that.

The following tutorial was created by Blue Dino Code, for the purpose of helping people like you learn SDL. This tutorial, though not purposely a part

The following tutorial was created by Blue Dino Code, for the purpose of helping people like you learn SDL. This tutorial, though not purposely a part

MixBox is a set of C++ classes that makes it easy to add sound and music to your games. The MixBox class is the main one. It holds all the sound and music data and has functions that access just about everything you'd want. The other classes, SoundID, MusicID, and ChannelID, are all subclasses of MixID. Each of these classes has functions that roughly duplicate what the MixBox class can do for that type of object, but having them lets you choose how best to work MixBox into your game.