[Cpp-Programming] Looping to get user input causes infinite loop

Hi all,

Please bear in mind i'm a complete novice when it comes to c! I'm
building a program that gets input from the user. I am using scanf to
get a line and then do some processing and this is working fine. The
problem comes when I try to loop through this until the user enters
'quit'. It works fine the first time round but then just goes into an
infinite loop. The code is below:

while (1) {

char expr[100] = {0};

printf("Input Expression:");
scanf("%[^\n]", expr);

if (strcmp(expr, "quit") == 0) { return 0; }

// do stuff here

printf("\n");

}

This has been simplified by removing some extra code that processes
the input however I don't think this is where the problem lies. I
think it's something to do with the scanf but am unsure what. Any
pointers greatly appreciated!

Cheers,
James
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