From de74d41ee0231a5290c5dc1801a52284e2f46fee Mon Sep 17 00:00:00 2001 From: Gentoo Date: Sat, 27 Mar 2021 10:24:44 +1100 Subject: initial commit --- LICENCE | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 14 ++ main.c | 110 +++++++++++ primes.h | 7 + 4 files changed, 805 insertions(+) create mode 100644 LICENCE create mode 100644 Makefile create mode 100644 main.c create mode 100644 primes.h diff --git a/LICENCE b/LICENCE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENCE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..0943fc4 --- /dev/null +++ b/Makefile @@ -0,0 +1,14 @@ +CC=gcc +CFLAGS=-O3 -march=native -flto -pipe -lm + +OBJ = main.o + +%.o: %.c $(DEPS) + $(CC) -c -o $@ $< $(CFLAGS) + +primecheck: $(OBJ) + $(CC) -o $@ $^ $(CFLAGS) + +clean: + rm primecheck + rm main.o diff --git a/main.c b/main.c new file mode 100644 index 0000000..af3ccb4 --- /dev/null +++ b/main.c @@ -0,0 +1,110 @@ +#include +#include +#include +#include + +#include "primes.h" +#define DEFAULT_SIZE 30 + +//powq(): square roots +unsigned long long powq(int number, int power) +{ +unsigned long long result = 1;//result int, 1 by default +if (!power){return 1;}//if to the power of 0, return 1 +while(power)//loop until all powers have been calculated + { + result *= number;//in the end result=number*number*number*etc until power is reached + --power;//--power since a power has been calculated + } +return result; +} + +void checkPrime(char s[], int length) +{ +//if (s[0] == '\0'){result[0] = 'E'; result[1] = '\0'; return;}//catch case of blank input +//if (s[0] == '0' && s[1] == '\0'){printf("0\t| 0\n"); result[0] = '0'; result[1] = '\0'; return;}//catch case of 0 input +if (s[0] == '\0'){printf("Error\n"); return;}//catch case of blank input +if (s[0] == '0' && s[1] == '\0'){printf("Error\n"); return;}//catch case of 0 input +if (s[0] == '1' && s[1] == '\0'){printf("We all know that 1 isn't a prime number\n"); return;}//catch case of 1 input + +int power = 0; //int to store the power. +while(s[power] != '\0'){++power;}//increment power for however many non-null chars in the string. +--power;//The correct power is actually one less than above returns + +int i = 0;//counter int +long input = 0;//where the converted int is stored +while (s[i] != '\0')//convert the string of decimal numbers into a long long int + { + if (s[i] >= '0' && s[i] <= '9'){input += ((s[i] - '0') * powq(10,power));}//integer = integer + ([char converted to number] * (10^[position of number in string])) + ++i; + --power;//Deincrement the power. E.g. ([charvalue]*(10^3))+([nextcharvalue]*(10^2)) etc + } + +double squareRoot = sqrt((double)input); +printf("Square root: %lf\n", squareRoot); + +i=0; +while(1) + { + if (primes[i] > (int)squareRoot){printf("%d is larger than %lf. Prime\n", primes[i], squareRoot); return;}//if the prime is larger than the integer part of the sqaure root, it is not a prime + if ((input % primes[i]) != 0) + { + printf("%ld / %d = %lf not round\n", input, primes[i], (double)input/primes[i]); + if (i > 998){printf("Out of primes. Good job\n"); exit(1);} + ++i;//move up to next prime + } + else + { + printf("%ld / %d = %ld round\n", input, primes[i], input/primes[i]); + printf("Round result, number is not prime\n"); + break; + } + + } + + +} + +int main(int argc, char *argv[]) +{ +char input[DEFAULT_SIZE];//input string is DEFAULT_SIZE in length + +if (!argv[1]){goto stdinMode;} + + if (argv[1]) + { + printf("Usage (stdin mode): %s\n", argv[0]); + printf("Ctrl+D to exit\n"); + printf("Determines if number is prime and shows working.\n"); + printf("Licence: GPLv3\n"); + return 0; + } + +stdinMode: ; +int i; +nextnum: i=0; +char *character = fgets(input, DEFAULT_SIZE, stdin); +if (!character){exit(0);}//exit if EOF (fgets() returns -1 on EOF or error) +character = strstr(input,"\n");//try to find the newline in the input so it can be overwritten +if (!character){printf("Input too long\n"); while(getchar() != '\n'); goto nextnum;}//if more than 40 chars were read, input was too long +character = '\0'; //overwrite newline with null char + +//strip out invalid chars from the input string +int j;//another counter variable +for (i=0; input[i] != '\0'; ++i) + { + if ((input[i] < '0')||(input[i] > '9'))//if input[i] is an invalid character + { + j=i; + while(input[j] != '\0'){input[j++] = input[j+1];}//shift all characters above left, overwriting the character + --i;//deincrement i, since the string was just shrunk by one and the one just above could indeed be a matching char + } + } + +checkPrime(input, DEFAULT_SIZE-1); + +goto nextnum; + +return 0; +} + diff --git a/primes.h b/primes.h new file mode 100644 index 0000000..214479d --- /dev/null +++ b/primes.h @@ -0,0 +1,7 @@ +#ifndef PRIMES_H +#define PRIMES_H +int 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 +}; + +#endif -- cgit v1.2.3