选择题：Interrupts are an important part of embedded systems. Consequently, many compiler vend

Interrupts are an important part of embedded

systems. Consequently, many compiler vendors

offer an extension to standard C to support interrupts.

Typically, the keyword is __interrupt. The following

code uses __interrupt to define an interrupt service

routine (ISR). Point out problems in the code.

__interrupt double compute_area (double radius)

{

double area = PI * radius * radius;

printf("\nArea = %f", area);

return area;

}