//印出多個星星(巢狀迴圈), console.log
function stars(n){
	for(var i=1; i<=n; i++){
		var result = ''
		for(var j = 1; j<=i; j++){
			result += '*'
		}console.log(result)
	}
}

stars(5)

//印出多個星星並加空行，return
function stars(n){
	var result = ''
	for(var j = 1; j<=n; j++){
		result += '*'
	}
	return result
}

function makeStars(num){
	var arr = []
	for(var i =1; i<=num; i++){
		arr.push(stars(i))
	}
	return arr.join('\n')
}

console.log(makeStars(5))

//1~N~1 顆樣式的星星
function stars(n){
	var result = ''
	for(var j = 1; j<=n; j++){
		result += '*'
	}
	return result
}

function stars2(num){
	for(var i=1; i<=num; i++){
		console.log(stars(i))
	}
	for(var i=num-1; i>0; i--){
		console.log(stars(i))
	}
}
stars2(5)

//9*9乘法表
function table9to9(){
	for(var i = 1; i<= 9; i++){
		for(var j=1; j<=9; j++){
			console.log( i + "*"+ j + "="+ (i*j))
		}
	}
}
table9to9()