how do i get this program to work, anyone, anyone?

This is a discussion on how do i get this program to work, anyone, anyone? within the C Programming forums, part of the General Programming Boards category; Here is the actual question: an interview The program has three seperate files within its own directory ie. primes,h, main.c ...

  1. #1
    TransparentMember correlcj's Avatar
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    Question how do i get this program to work, anyone, anyone?

    Here is the actual question:

    an interview The program has three seperate files within its own directory ie. primes,h, main.c and is_prime.c The table looks like this:
    PRIMES WILL BE PRINTED.
    How many do you want to see? 300o
    1: 2
    2: 3
    3: 5
    4: 7
    5: 11
    ....
    25: 97
    26: 101
    ....
    300: 27449

    The question states: TExpalin how is_prime() works. Complete the program by writing main() in main.c. There 168 primes that are less than 1000. Does your program confirm this? How many primesnew are less than 10,000?

    I hope this is better, sorry for the confusion.

    In file primes.h:

    #include<stdio.h>
    #include<stdlib.h>

    int is_prime(int n);



    In file is_prime.c

    #include "primes.h"

    int is_prime(int n)
    {
    int k, limit;

    if (n==2)
    return 1;
    if (n % 2 == 0)
    return 0;
    limit = n / 2;
    for (k = 3; k <= limit; k +=2)
    if (n % k == 0)
    return 0;
    return 1;
    }

    in
    Last edited by correlcj; 07-04-2002 at 01:54 PM.

  2. #2
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    Could you please clarify on what the problem is.

  3. #3
    Registered User The Dog's Avatar
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    Cape Town
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    788
    Try this :

    Code:
    int	IsPrime(unsigned long number)
    {
    	int i;
    
    	if(number==2)
       		return 1;
    	for(i=(number/2);i > 1;i--)
    	{
       		if(number%i==0)
    		{
          		return 0;
    		}
    	}
    	return 1;
    }
    btw i'm still not sure what it is you want to do.

  4. #4
    Registered User raimo's Avatar
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    If you want to know the first 3000 primes are less than or equal to 27449.

    You checker should work, but if you want to find 3000 first primes, it is not the optimal way to this.

    What is this?

    You wrote:
    > printf("\n%s\n",
    > "PRIMES WILL BE PRINTED\n");

    And why you posted two main functions?

  5. #5
    TransparentMember correlcj's Avatar
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    Why?!?!

    I am unsure why. I was trying to print out a banner for the primes program. I edited the program better so everyone could understand what the question is asking. By the way your from espaņa and where abouts if you dont mind me asking?


  6. #6
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    Lightbulb Re: how do i get this program to work, anyone, anyone?


    The main idea is to find a prime faster by tying to divide N with
    all primes from 2 to sqrt(N)!!!

    This buf[] is enough to find out primes up to 1e8!!!

    #include <stdio.h>

    const int buf[]=
    {
    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, 7927, 7933,
    7937, 7949, 7951, 7963, 7993, 8009, 8011, 8017, 8039, 8053,
    8059, 8069, 8081, 8087, 8089, 8093, 8101, 8111, 8117, 8123,
    8147, 8161, 8167, 8171, 8179, 8191, 8209, 8219, 8221, 8231,
    8233, 8237, 8243, 8263, 8269, 8273, 8287, 8291, 8293, 8297,
    8311, 8317, 8329, 8353, 8363, 8369, 8377, 8387, 8389, 8419,
    8423, 8429, 8431, 8443, 8447, 8461, 8467, 8501, 8513, 8521,
    8527, 8537, 8539, 8543, 8563, 8573, 8581, 8597, 8599, 8609,
    8623, 8627, 8629, 8641, 8647, 8663, 8669, 8677, 8681, 8689,
    8693, 8699, 8707, 8713, 8719, 8731, 8737, 8741, 8747, 8753,
    8761, 8779, 8783, 8803, 8807, 8819, 8821, 8831, 8837, 8839,
    8849, 8861, 8863, 8867, 8887, 8893, 8923, 8929, 8933, 8941,
    8951, 8963, 8969, 8971, 8999, 9001, 9007, 9011, 9013, 9029,
    9041, 9043, 9049, 9059, 9067, 9091, 9103, 9109, 9127, 9133,
    9137, 9151, 9157, 9161, 9173, 9181, 9187, 9199, 9203, 9209,
    9221, 9227, 9239, 9241, 9257, 9277, 9281, 9283, 9293, 9311,
    9319, 9323, 9337, 9341, 9343, 9349, 9371, 9377, 9391, 9397,
    9403, 9413, 9419, 9421, 9431, 9433, 9437, 9439, 9461, 9463,
    9467, 9473, 9479, 9491, 9497, 9511, 9521, 9533, 9539, 9547,
    9551, 9587, 9601, 9613, 9619, 9623, 9629, 9631, 9643, 9649,
    9661, 9677, 9679, 9689, 9697, 9719, 9721, 9733, 9739, 9743,
    9749, 9767, 9769, 9781, 9787, 9791, 9803, 9811, 9817, 9829,
    9833, 9839, 9851, 9857, 9859, 9871, 9883, 9887, 9901, 9907,
    9923, 9929, 9931, 9941, 9949, 9967, 9973
    };

    long m,n;

    int isprime(const long a) {
    long i,b;

    for (i=0;buf[i]*buf[i]<=b;i++)
    if (b%buf[i]==0) return 0;
    return 1;
    }

    int main() {
    long p;

    printf("Enter field [start;end]: ");
    scanf("%ld %ld",&m,&n);
    p=m;
    while (p<=n) {
    if (is_prime(p)) printf("%ld\n");
    p++;
    }
    return 0;
    }


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