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310 • Chapter 8: Debugging and Efficiency where numLevels To illustrate these commands, consider the following example. The procedure check calls the sumn procedure from the previous example. > check := proc(i) local p, a, b; > p := ithprime(i); > a := sumn(p); > b := p*(p+1)/2; > evalb( a=b ); > end proc: There is a (conditional) breakpoint in sumn. > showstat(sumn); sumn := proc(n) local i, sum; 1 sum := 0; 2 for i to n do 3? sum := sum+i end do end proc When check calls sumn, the breakpoint invokes the debugger. > check(9); 10 sumn: 3? sum := sum+i The where debugger command reveals that: • check was invoked from the top-level with argument 9, • check called sumn with argument 23, and • execution stopped at statement number 3 in sumn. DBG > where
