21. 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 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;

　　}

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