простая задачка JS

202

16 октября 2017, 00:35

Прога должна выявить сколько дней осталось до нового года! В чем заключается моя ошибка?

Выводит: your inputs is not correct

var real; 
var answer; 
var days; 
var year = 365; 
var yMonth = prompt('Enter your month(with numbers)'); 
var yDay = prompt('Enter your day(with numbers)'); 
 
switch (yMonth) { 
  case 1: 
    { 
      real = 31; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 2: 
    { 
      real = 59; 
      days = 28; 
      answer = (year - real + (days - yDay)); 
      console.log(answer); 
      break; 
    } 
 
  case 3: 
    { 
      real = 90; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 4: 
    { 
      real = 120; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 5: 
    { 
      real = 151; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 6: 
    { 
      real = 181; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 7: 
    { 
      real = 212; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 8: 
    { 
      real = 243; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 9: 
    { 
      real = 273; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 10: 
    { 
      real = 304; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 11: 
    { 
      real = 334; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 12: 
    { 
      real = 365; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  default: 
    alert('your inputs is not correct'); 
}

Answer 1

В yMonth и yDay после ввода пользователя будут строки. В switch вы сравниваете их с числами, поэтому совпадений нет. Самый простой вариант преобразовать ввод пользователя к числу:

var yMonth=+prompt('Enter your month(with numbers)');
var yDay=+prompt('Enter your day(with numbers)');

var real; 
var answer; 
var days; 
var year=365; 
 
var yMonth=+prompt('Enter your month(with numbers)'); 
 
var yDay=+prompt('Enter your day(with numbers)'); 
 
switch (yMonth) { 
	case 1:{real=31; 
		   days=31; 
		   answer=year-real+(days-yDay); 
		   console.log(answer); 
	break; 
	} 
 
	case 2:{real=59; 
		   days=28; 
		   answer=(year-real+(days-yDay)); 
		   console.log(answer); 
	break;} 
 
	case 3:{real=90; 
		   days=31; 
		   answer=year-real+(days-yDay); 
		   console.log(answer); 
	break;} 
 
	case 4:{real=120; 
		   days=30; 
		   answer=year-real+(days-yDay); 
		   console.log(answer); 
	break;} 
 
	case 5:{real=151; 
		   days=31; 
		   answer=year-real+(days-yDay); 
		   console.log(answer); 
	break;} 
 
		case 6:{real=181; 
			days=30; 
			answer=year-real+(days-yDay); 
			console.log(answer); 
	break;} 
 
		case 7:{real=212; 
			   days=31; 
			   answer=year-real+(days-yDay); 
			   console.log(answer); 
	break;} 
 
		case 8:{real=243; 
			   days=31; 
			   answer=year-real+(days-yDay); 
			   console.log(answer); 
	break;} 
 
		case 9:{real=273; 
			   days=30; 
			   answer=year-real+(days-yDay); 
			   console.log(answer); 
	break;} 
 
		case 10:{real=304; 
			   days=31; 
			   answer=year-real+(days-yDay); 
			   console.log(answer); 
	break;} 
 
		case 11:{real=334; 
			   days=30; 
			   answer=year-real+(days-yDay); 
			   console.log(answer); 
	break;} 
 
		case 12:{real=365; 
			   days=31; 
			   answer=year-real+(days-yDay); 
			   console.log(answer); 
	break;} 
	 
	default:alert('your inputs is not correct'); 
 
}

Answer 2

Вводимые юзером значения в prompt являются строками. Чтобы привести их к числовому типу, можно использовать, например, parseInt():

var real; 
var answer; 
var days; 
var year = 365; 
 
var yMonth = parseInt(prompt('Enter your month(with numbers)')); 
 
var yDay = parseInt(prompt('Enter your day(with numbers)')); 
 
switch (yMonth) { 
  case 1: 
    { 
      real = 31; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 2: 
    { 
      real = 59; 
      days = 28; 
      answer = (year - real + (days - yDay)); 
      console.log(answer); 
      break; 
    } 
 
  case 3: 
    { 
      real = 90; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 4: 
    { 
      real = 120; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 5: 
    { 
      real = 151; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 6: 
    { 
      real = 181; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 7: 
    { 
      real = 212; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 8: 
    { 
      real = 243; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 9: 
    { 
      real = 273; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 10: 
    { 
      real = 304; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 11: 
    { 
      real = 334; 
      days = 30; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  case 12: 
    { 
      real = 365; 
      days = 31; 
      answer = year - real + (days - yDay); 
      console.log(answer); 
      break; 
    } 
 
  default: 
    alert('your inputs is not correct'); 
 
}