Never used Sprintf before. My program crashes once the sprintf should begin

The purpose of this code is to let the user enter a name of a song into a string, which can then be buffered and played into a program called 'mplayer'.

Code:

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(void)
{
    int menu, option, playchoice;      // for switch case- ignore this.
    char song[20];                            // string for song name

                                  printf("Which song?");
                                  scanf("%s", &song);    // sets song name to 'song'
                                  sprintf("buffer, system(%s)", song);       
                                  system("buffer");
                                  sprintf("buffer.mplayer %s", song);
system("pause");
}

---

I have just selected the bits relating to this code as the other code (switch statements) are not the problem.

This is for a program called 'mplayer'. There are no compiling errors. It just stops responding and Windows closes it. I am new to programming and have had difficulties getting this far.

Thanks for any help!

Code:

---

char buffer[100];
sprintf( buffer, "mplayer %s", song );
system( buffer );

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SourceForge.net: Scanf woes - cpwiki

Thank you SO much Salem! This makes more sense than the rubbish I wrote lol.

You should also prevent buffer overflow by modifying your scanf line to have something like "%19s" rather than just "%s".
Of course I would make the song buffer much larger first, perhaps MAX_PATH+1 in size.

Thank you, iMalc!. I'll look into this. We haven't even learnt about buffering yet, but I have a rough idea, so this will be useful when I've looked into it!