Access violation writing location 0x00000000. reading int from keyboard

Question

I am trying to read the input from a keyboard which i will use to create a set of multiplications. If i hardcode the integer to use then the program works fine however when

Answer 1

scanf("%d", multiple);

should be:

scanf("%d", & multiple);

In other words, you need to give scanf a pointer to the thing you want to read into. This is a classic mistake in the use of scanf(), and one everyone makes from time to time, so remember this for the next time you make it :-)