Задача 1 от домашното по математика.PRIME NUMBERS

Във форума е въведено ограничение, което позволява на потребителите единствено да разглеждат публикуваните въпроси.

ivan.mitrev 3 Точки

Задача 1 от домашното по математика.PRIME NUMBERS

Малко помощ с кода?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
int i = 3, count, c, d;

Console.WriteLine("Enter the number of prime number required");
int n = int.Parse(Console.ReadLine());

if (n <= 1)
{
Console.WriteLine("First %d-th prime number is :", n);
Console.WriteLine("2");
}
else
{
for (count = 2; count <= n; )
{
for (c = 2; c <= i - 1; c++)
{
if (i % c == 0)
break;
}
if (c == i)
{
count++;
}
i++;
}
Console.WriteLine("%d-th prime number is :", n);
Console.WriteLine("%d\n", i - 1);
Console.ReadKey();
}
}
}
}

Първо го написах на c, после C помоща на гуглето го докарах до C#.Та въпроса ми е:

Console.WriteLine("%d-th prime number is :", n);

Където при C "%d" е променливата d.Как да го направя там да се появява стойността на d?

Тагове:

17/08/2015 18:50:29 Programming Basics

Mozez 55 Точки

Пишеш така Console.WriteLine("{0}-th prime number is: ", d);

Ако имаш две променливи (int v1 = 3, int v2 = 5) правиш така Console.WriteLine("first variable = {0}, second variable = {1}", v1,v2);

Аналогично при провече променливи в къдревите скоби увеличаваш номера.

17/08/2015 19:16:30 17/08/2015 19:19:42

dggeorgiev 14 Точки

Както Mozez е написал, форматирането на стойностите става чрез поставянето на номера на подаваната стойност във фигурни скоби - {n} (където n е поредния номер на стойност, която ще подадеш след форматиращия низ). Можеш да прочетеш повече за форматирането на низове тук: https://msdn.microsoft.com/en-us/library/system.string.format(v=vs.110).aspx

17/08/2015 19:23:40 17/08/2015 19:24:30

KarkadVantas 7 Точки

//prime-ovete kopnati ot google
//javascript
var primes = [2,3,5,7,11,13,17,19,23,29 ,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101, 103,107, 109, 113 , 127, 131, 137, 139, 149, 151, 157, 163, 167, 173 , 179, 181, 191, 193, 197, 199, 211, 223, 227, 229 , 233, 239, 241, 251, 257, 263, 269, 271, 277, 281 , 283, 293, 307, 311, 313, 317, 331, 337, 347, 349 , 353, 359, 367, 373, 379, 383, 389, 397, 401, 409 , 419, 421, 431, 433, 439, 443, 449, 457, 461, 463 , 467, 479, 487, 491, 499, 503, 509, 521, 523, 541 , 547, 557, 563, 569, 571, 577, 587, 593, 599, 601 , 607, 613, 617, 619, 631, 641, 643, 647, 653, 659 , 661, 673, 677, 683, 691, 701, 709, 719, 727, 733 , 739, 743, 751, 757, 761, 769, 773, 787, 797, 809 , 811, 821, 823, 827, 829, 839, 853, 857, 859, 863 , 877, 881, 883, 887, 907, 911, 919, 929, 937, 941 , 947, 953, 967, 971, 977, 983, 991, 997,1009,1013 ,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069 ,1087,1091,1093,1097,1103,1109,1117,1123,1129,1151 ,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223 ,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291 ,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373 ,1381,1399,1409,1423,1427,1429,1433,1439,1447,1451 ,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511 ,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583 ,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657 ,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733 ,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811 ,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889 ,1901,1907,1913,1931,1933,1949,1951,1973,1979,1987 ,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053 ,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129 ,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213 ,2221,2237,2239,2243,2251,2267,2269,2273,2281,2287 ,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357 ,2371,2377,2381,2383,2389,2393,2399,2411,2417,2423 ,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531 ,2539,2543,2549,2551,2557,2579,2591,2593,2609,2617 ,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687 ,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741 ,2749,2753,2767,2777,2789,2791,2797,2801,2803,2819 ,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903 ,2909,2917,2927,2939,2953,2957,2963,2969,2971,2999 ,3001,3011,3019,3023,3037,3041,3049,3061,3067,3079 ,3083,3089,3109,3119,3121,3137,3163,3167,3169,3181 ,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257 ,3259,3271,3299,3301,3307,3313,3319,3323,3329,3331 ,3343,3347,3359,3361,3371,3373,3389,3391,3407,3413 ,3433,3449,3457,3461,3463,3467,3469,3491,3499,3511 ,3517,3527,3529,3533,3539,3541,3547,3557,3559,3571 ,3581,3583,3593,3607,3613,3617,3623,3631,3637,3643 ,3659,3671,3673,3677,3691,3697,3701,3709,3719,3727 ,3733,3739,3761,3767,3769,3779,3793,3797,3803,3821 ,3823,3833,3847,3851,3853,3863,3877,3881,3889,3907 ,3911,3917,3919,3923,3929,3931,3943,3947,3967,3989 ,4001,4003,4007,4013,4019,4021,4027,4049,4051,4057 ,4073,4079,4091,4093,4099,4111,4127,4129,4133,4139 ,4153,4157,4159,4177,4201,4211,4217,4219,4229,4231 ,4241,4243,4253,4259,4261,4271,4273,4283,4289,4297 ,4327,4337,4339,4349,4357,4363,4373,4391,4397,4409 ,4421,4423,4441,4447,4451,4457,4463,4481,4483,4493 ,4507,4513,4517,4519,4523,4547,4549,4561,4567,4583 ,4591,4597,4603,4621,4637,4639,4643,4649,4651,4657 ,4663,4673,4679,4691,4703,4721,4723,4729,4733,4751 ,4759,4783,4787,4789,4793,4799,4801,4813,4817,4831 ,4861,4871,4877,4889,4903,4909,4919,4931,4933,4937 ,4943,4951,4957,4967,4969,4973,4987,4993,4999,5003 ,5009,5011,5021,5023,5039,5051,5059,5077,5081,5087 ,5099,5101,5107,5113,5119,5147,5153,5167,5171,5179 ,5189,5197,5209,5227,5231,5233,5237,5261,5273,5279 ,5281,5297,5303,5309,5323,5333,5347,5351,5381,5387 ,5393,5399,5407,5413,5417,5419,5431,5437,5441,5443 ,5449,5471,5477,5479,5483,5501,5503,5507,5519,5521 ,5527,5531,5557,5563,5569,5573,5581,5591,5623,5639 ,5641,5647,5651,5653,5657,5659,5669,5683,5689,5693 ,5701,5711,5717,5737,5741,5743,5749,5779,5783,5791 ,5801,5807,5813,5821,5827,5839,5843,5849,5851,5857 ,5861,5867,5869,5879,5881,5897,5903,5923,5927,5939 ,5953,5981,5987,6007,6011,6029,6037,6043,6047,6053 ,6067,6073,6079,6089,6091,6101,6113,6121,6131,6133 ,6143,6151,6163,6173,6197,6199,6203,6211,6217,6221 ,6229,6247,6257,6263,6269,6271,6277,6287,6299,6301 ,6311,6317,6323,6329,6337,6343,6353,6359,6361,6367 ,6373,6379,6389,6397,6421,6427,6449,6451,6469,6473 ,6481,6491,6521,6529,6547,6551,6553,6563,6569,6571 ,6577,6581,6599,6607,6619,6637,6653,6659,6661,6673 ,6679,6689,6691,6701,6703,6709,6719,6733,6737,6761 ,6763,6779,6781,6791,6793,6803,6823,6827,6829,6833 ,6841,6857,6863,6869,6871,6883,6899,6907,6911,6917 ,6947,6949,6959,6961,6967,6971,6977,6983,6991,6997 ,7001,7013,7019,7027,7039,7043,7057,7069,7079,7103 ,7109,7121,7127,7129,7151,7159,7177,7187,7193,7207 ,7211,7213,7219,7229,7237,7243,7247,7253,7283,7297 ,7307,7309,7321,7331,7333,7349,7351,7369,7393,7411 ,7417,7433,7451,7457,7459,7477,7481,7487,7489,7499 ,7507,7517,7523,7529,7537,7541,7547,7549,7559,7561 ,7573,7577,7583,7589,7591,7603,7607,7621,7639,7643 ,7649,7669,7673,7681,7687,7691,7699,7703,7717,7723 ,7727,7741,7753,7757,7759,7789,7793,7817,7823,7829 ,7841,7853,7867,7873,7877,7879,7883,7901,7907,7919]

console.log(primes[101])

Този метод не е ли малко по-бърз ;).

Числото от 0 или от 1 трябва да го броим за домашното?

17/08/2015 21:14:04 17/08/2015 21:14:41

ivan.mitrev 3 Точки

Така не е интересно :) Иначе става !

17/08/2015 21:26:30

Dyno1990 4 Точки

Здравейте, по-долу съм дал още един метод за печат на простите числа в конзолата. Готиното при него е, че с добавянето на една променлива counter може да се сложи индекс на числата и така по-лесно да се правят домашните. Къде трябва да се сложи counter-a ще оставя всички да видят сами.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PrimeNumbersPrint

{
    class Program
    {
        static void Main(string[] args)
        {
            bool isPrime = true;        
            Console.WriteLine("Prime Numbers : ");
            for (int i = 2; i &lt;= 100; i++)
            {
                for (int j = 2; j &lt;= 100; j++)
                {
                    if (i != j &amp;&amp; i % j == 0)
                    {
                        isPrime = false;
                        break;
                    }                    
                }
                if (isPrime)
                {
                    Console.Write("\t" + i);
                }
                isPrime = true;
            }
            Console.ReadKey();
        }
    }
}

18/08/2015 23:58:13

djc_bg2015 923 Точки

Винаги проверявай едно число дали е просто, до корен квадратен от него. Спестяваш много проверки, които иначе са излишни.

19/08/2015 09:48:01