Why is it saying illegal instruction ?

Question

https://code.sololearn.com/cQxZfNpNW38l/?ref=app

Answer 1

You can fix that by declaring the functions as void:
void easy() {...}
void min() {...}
void hard() {...}
void insane() {...}

Answer 2

#CODER
I tried flushing the input buffer to stop causing the infinite loop when given a wrong format by putting fflush(stdin) inside the default switch statement. It worked though

NB. I don't know why, but it only works when I use scanf to read the input instead of using cin

Answer 3

I suspect that the program behaves weird, because you declared the easy, min, hard and insane function to return an integer, but they don't return anything anyways.

Answer 4

There was also a risk for causing an infinite loop. When it asks for difficulty, and if wrong type of value was given, an infinite loop was caused.

Answer 5

I don't actually know. The problem is, when an integer is required, but unnumeric characters were given.

Answer 6

It worked !! Thanks !!

Answer 7

How to fix that ?

Answer 8

Hmm..weird