13. Divide Overflow

If a division operand produces a quotient that is too large to fit into the destination operand, divide overflow exception results.
This causes a CPU interrupt, and the current program halts.
For example, the following instructions generate a divide overflow because the quotient 100h will not fit into the AL register:
```
    mov ax, 1000h
    mov bl, 10h
    div bl         ; AL cannot hold 100h, program crashes
```
One thing to do to reduce the probability of a divide overflow condition is to use a 32-bit divisor:
```
    mov eax, 1000h
    cdq
    mov ebx, 10h
    div ebx        ; EAX = 100h
```

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