var NP = 75; // Number of problems var sol = new Array(1,3,3,3,1,2,1,2,3,4,4,1,1,4,1,3,2,1,2,2,1,3,2,1,2,1,2,1,3,4,4,4,1,2,1,1,2,1,4,3,4,1,4,1,1,2,4,3,1,1,2,3,2,1,2,1,1,1,3,1,1,4,4,3,1,1,1,3,1,3,1,3,2,2,3); var tested = new Array(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0); var existsWin2 = 0; var num = 1; var cp = 0; // Current problem var cmode = 0; var good = 0; function Start(mode) { cmode = mode; for ( i=0; i<75; i++ ) { tested[i] = 0; } if ( mode==1 ) { for ( i=25; i<75; i++ ) { tested[i] = 1; } } else if ( mode==2 ) { for ( i=50; i<75; i++ ) { tested[i] = 1; } } else if ( mode==3 ) { for ( i=25; i<50; i++ ) { tested[i] = 1; } } DisplayProblem(0); } function DisplayProblem(problem) { win2 = window.open("","Problem","location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=550,height=500"); win2.focus(); if ( problem==0 ) { cp++; with(Math) { num=floor(NP*random())+1; } if ( tested[num-1] ) { for ( i=0; iNP ) { num=1; } if ( !tested[num-1] ) { break; } } if ( i==NP ) { DisplayFinalPage(); return; } } } else { num = problem; } win2.document.open(); win2.document.writeln(""); win2.document.write("Problem "+cp+": "); win2.document.write("Is the function

"); win2.document.write("continuous at

? "); win2.document.writeln("If not, why?"); win2.document.writeln("

"); win2.document.writeln("

"); win2.document.writeln("

"); win2.document.writeln("Choices are:

"); win2.document.writeln("

"); win2.document.close(); existsWin2=1; } function DisplayComment(num) { win2.document.writeln("

Comments:

"); ans = sol[num-1]; if ( ans==1 || ans==4 ) { win2.document.writeln("

"); win2.document.writeln("

"); } else if ( ans==2 ) { win2.document.writeln("

is not defined."); } else if ( ans==3 ) { win2.document.write("

but "); win2.document.write("

"); win2.document.writeln("does not exist."); } } function DisplaySolution(num,problem,form) { var num1 = 1; if ( tested[num-1]==1 && problem==0 ) { DisplayProblem(0); return; } tested[num-1] = 1; if ( form.test[0].checked ) { num1 = 1; } else if ( form.test[1].checked ) { num1 = 2; } else if ( form.test[2].checked ) { num1 = 3; } else num1 = 4; win2.document.open(); win2.document.writeln(""); win2.document.write("Problem "+cp+": "); win2.document.write("Is the function

"); win2.document.write("continuous at

? "); win2.document.writeln("If not, why?"); win2.document.writeln("

"); win2.document.writeln("

"); win2.document.writeln("

"); win2.document.write("Your answer:

"+num1+". "); if ( num1==1 ) { win2.document.write(" is continuous at "); win2.document.writeln(" ."); } else if ( num1==2 ) { win2.document.writeln(" is not defined."); } else if ( num1==3 ) { win2.document.write(" is defined but "); win2.document.writeln(" does not exist."); } else { win2.document.write(" is defined and "); win2.document.write(" exists but "); win2.document.writeln("these two numbers are not equal."); } if ( sol[num-1] == num1 ) { win2.document.writeln("

You are RIGHT!

"); DisplayComment(num); if ( problem==0 ) { good++; } win2.document.write("

"); win2.document.writeln(""); win2.document.writeln("

"); } else { win2.document.writeln("

You are WRONG!

"); win2.document.write("

:"); win2.document.writeln(""); } win2.document.close(); } function closeWin() { onerror=null if (existsWin2 ==1 ) {win2.close()} } function perc(x,y) { return Math.round(1000.0*(x/y))/10.0; } function DisplayFinalPage() { win2.document.open(); win2.document.writeln(""); win2.document.write(" You have reached the end of this quiz."); win2.document.writeln(" Thank you!

"); win2.document.writeln("You answered correctly "+good+" problems out of "+cp+" possible, which totals about "+perc(good,cp)+"%

"); cp = 0; win2.document.write(""); win2.document.write("Click here to run the test again.

"); win2.document.write(""); win2.document.write("Click here to quit."); win2.document.close(); }