logical operation & pre-increment in c

Question

Can any one explain why c still equal 15 after execution

int main(void)
{
    int t,a=5,b=10,c=15;
        t= ++a||++c;
        printf("%d  %d  %d",t,a,c);
}

Answer 1

The logical-or operator || is a short-circuit operator. If the left side evaluates to a true boolean value (i.e. not 0), then the right side doesn't execute.

Similarly for the logical-and operator &&, if the left hand side is false (i.e. 0) the right hand side does not execute.