help with compiling

[Dr.Spok]

Im trying to compile a program that is using switch statements and I get this warning concerning about 20lines of my program.
"warning: multi-line string literals are depricated" if anyone could tell me what this means and/or how to fix it, the help would be greatly appreciated.
thanks

[Salem]

You have

printf( "hello
world" );

Change it to say

printf( "hello\n"
        "world" );