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

You are not passing the address of variable for multiple to store the result from scanf hence the requirement for scanf("%d", &multiple);.

This is telling the runtime, to read an integer and place it into the address-of variable, hence & must be used. Without it, you got a runtime error as you are passing the value of the variable but the runtime does not know what to do with it.

In a nut-shell, an address-of variable is indicated by &.

Hope this helps, Best regards, Tom.