Advanced C++ Programming Cookbook

Divide-by-zero errors

One of the easiest examples to demonstrate with UBSAN is the divide-by-zero error, as follows:

int main(void){    int n = 42;    int d = 0;    auto f = n/d;}

When this is run, we see the following:

In the preceding example, we create two integers (a numerator and a denominator) with the denominator set to 0. We then divide the numerator and the denominator resulting in a divide-by-zero error, which UBSAN detects and outputs as the program crashes.