var state=true;
if(number===undefined){number=0; var state=false;}

try {
	if(typeof number != "number"){ throw new Error("number is not a number"); }
} catch(e) {
	// statements
	console.log(e.message);

}
if(state){i=1;} else{i=0;}
for(;i<arguments.length;i++){
try {
	if(arguments[i]===0){ throw new Error("division by 0"); }
} catch(e) {
	// statements
	console.log(e.message);
}
}
var obj={
	sum: function (){

		if(state===false){i=0;}else{i=1;}
		for(;i<arguments.length;i++){
			number+=arguments[i];
		}
		return sm;},
	 dif: function(){

	 	if(state===false){i=0;}else{i=1;}
		for(;i<arguments.length;i++){
			number-=arguments[i];
		}
	 },
	div: function ()	 {
		if(state===false){return 0;};
		for(i=1;i<arguments.length; i++){
			number=number/arguments[i];
		}
		return number;
	},
	mul: function(){
		if(state===false){i=0;}else{i=1;}
		for(;i<arguments.length;i++){
			number*=arguments[i];
		}
	}
};

return obj;