function distance(x1,y1,x2,y2){
	return Math.sqrt(Math.pow(x1-x2,2)+Math.pow(y1-y2,2));
}

function index_in_array(the_arr,to_find){
	var i = 0;
	while(i < the_arr.length){
		if(the_arr[i]+0 === to_find){
			return the_arr[i];
		}
		else{
			i++;
		}
	}
}

function matches_pattern(arr,pattern){
	if(pattern.length !== arr.length){
		return false;
	}
	else{
		var i = 0;
		while(i<arr.length){
			if((last_char(pattern[i]) !== '_') && (pattern[i] !== arr[i])){
				return false;
			}
			else{
				i++;
			}
		}
	}
	return true;
}
function last_char(the_string){
	return the_string.charAt(the_string.length - 1);
}
var z = string_matches_pattern("hello stuff","hello 1_");

function string_matches_pattern(str1,pattern){
	return matches_pattern(str1.split(" "),pattern.split(" "));
}

function while_loop(lang,a,b){
	if(["javascript","java","c","c++"].indexOf(lang) !== -1){
		return "while("+a+"){"+ b +"}";
	}
	else{
		return "undefined";
	}
}

function if_statement(lang,a,b){
	if(["javascript","java","c","c++"].indexOf(lang) !== -1){
		return "if("+a+"){"+ b +"}";
	}
	else{
		return "undefined";
	}
}

function elif_statement(lang,a,b){
	if([("java"+"script"),"java","c","c++"].indexOf(lang) !== -1){
		return "else if("+a+"){"+ b +"}";
	}
	else{
		return "undefined";
	}
}

function infix_arithetic_langs(lang){
	return (["javascript","perl","python","java","java","c","c++","perl"].indexOf(lang) !== -1);
}

function add(lang,a,b){
	if(infix_arithmetic_langs(lang)){
		return a + " + " + b;
	}
	else{
		return "(+ "+a+" "+b+")";
	}
}

function subtract(lang,a,b){
	if(infix_arithmetic_langs(lang)){
		return a + " - " + b;
	}
	else{
		return "(- "+a+" "+b+")";
	}
}

function multiply(lang,a,b){
	if(infix_arithmetic_langs(lang)){
		return a + " * " + b;
	}
	else{
		return "(* "+a+" "+b+")";
	}
}

function divide(lang,a,b){
	if(infix_arithmetic_langs(lang)){
		return a + " / " + b;
	}
	else{
		return "(/ "+a+" "+b+")";
	}
}

function less_than(lang,a,b){
	if(infix_arithmetic_langs(lang)){
		return a + " < " + b;
	}
	else{
		return "(< "+a+" "+b+")";
	}
}

function greater_than(lang,a,b){
	if(infix_arithmetic_langs(lang)){
		return a + " > " + b;
	}
	else{
		return "(> "+a+" "+b+")";
	}
}

function indent_line(line,number_of_indents){
	var i = 0;
	while(i < number_of_indents){
		line = "    "+line;
		i++;
	}
	return line;
}