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JavaScript
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function area_of_circle(r, pi) { var area; if(arguments.length === 1){ var pi = 3.14; area=pirr; }else{ area=pirr; } return area; } area_of_circle(2,3.1416);
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function area_of_circle(r, pi) { var area; if(arguments.length === 1){ var pi = 3.14; area=pirr; }else{ area=pirr; } return area; } area_of_circle(2,3.1416);
liuxu321
var area; if(arguments.length === 1){ var pi = 3.14; area=pirr; }else{ area=pirr; } return area;