p8: fixed issue with p8 not following ANSI C standard
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parent
1c210b879d
commit
5e39e3554e
5 changed files with 73 additions and 25 deletions
1
Makefile
1
Makefile
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@ -15,6 +15,7 @@ p% : p%.c
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$(STRIP) $(BUILDDIR)/$@
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p7 : p7.c $(LIBDIR)/prime.o
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p8 : p8.c $(LIBDIR)/io.o
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p10 : p10.c $(LIBDIR)/prime.o
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p12 : p12.c $(LIBDIR)/prime.o
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20
data/8
Normal file
20
data/8
Normal file
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@ -0,0 +1,20 @@
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73167176531330624919225119674426574742355349194934
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96983520312774506326239578318016984801869478851843
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85861560789112949495459501737958331952853208805511
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12540698747158523863050715693290963295227443043557
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66896648950445244523161731856403098711121722383113
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62229893423380308135336276614282806444486645238749
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30358907296290491560440772390713810515859307960866
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70172427121883998797908792274921901699720888093776
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65727333001053367881220235421809751254540594752243
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52584907711670556013604839586446706324415722155397
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53697817977846174064955149290862569321978468622482
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83972241375657056057490261407972968652414535100474
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82166370484403199890008895243450658541227588666881
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16427171479924442928230863465674813919123162824586
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17866458359124566529476545682848912883142607690042
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24219022671055626321111109370544217506941658960408
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07198403850962455444362981230987879927244284909188
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84580156166097919133875499200524063689912560717606
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05886116467109405077541002256983155200055935729725
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71636269561882670428252483600823257530420752963450
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24
lib/io.c
Normal file
24
lib/io.c
Normal file
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@ -0,0 +1,24 @@
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#include "io.h"
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int readnum(FILE *fd, char *buf, size_t len) {
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int i = 0;
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for(;;) {
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int c = getc(fd);
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if (c == EOF)
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break;
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if (c < '0' || c > '9')
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continue;
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buf[i] = c;
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if (i+1 > len)
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break;
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i++;
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}
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return i;
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}
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9
lib/io.h
Normal file
9
lib/io.h
Normal file
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@ -0,0 +1,9 @@
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#ifndef __IO_H
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#define __IO_H
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#include <stdio.h>
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int readnum(FILE *fd, char *buf, size_t len);
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#endif /* __IO_H */
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44
p8.c
44
p8.c
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@ -9,31 +9,12 @@
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* No comment!
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*/
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#include <stdio.h>
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#include <malloc.h>
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#include "lib/io.h"
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#define N_CHARS 1000
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#define BIGWALLOFTEXT \
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"73167176531330624919225119674426574742355349194934\
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96983520312774506326239578318016984801869478851843\
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85861560789112949495459501737958331952853208805511\
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12540698747158523863050715693290963295227443043557\
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66896648950445244523161731856403098711121722383113\
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62229893423380308135336276614282806444486645238749\
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30358907296290491560440772390713810515859307960866\
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70172427121883998797908792274921901699720888093776\
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65727333001053367881220235421809751254540594752243\
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52584907711670556013604839586446706324415722155397\
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53697817977846174064955149290862569321978468622482\
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83972241375657056057490261407972968652414535100474\
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82166370484403199890008895243450658541227588666881\
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16427171479924442928230863465674813919123162824586\
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17866458359124566529476545682848912883142607690042\
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24219022671055626321111109370544217506941658960408\
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07198403850962455444362981230987879927244284909188\
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84580156166097919133875499200524063689912560717606\
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05886116467109405077541002256983155200055935729725\
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71636269561882670428252483600823257530420752963450"
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#define DATA "./data/8"
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int product(char *ptr, int n) {
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@ -48,11 +29,24 @@ int product(char *ptr, int n) {
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int main() {
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int i;
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char str[] = BIGWALLOFTEXT;
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char *str = malloc(N_CHARS);
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FILE *fd = fopen(DATA, "r");
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int tmp, r = 0;
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if (str == NULL) {
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fprintf(stderr, "memory error\n");
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return 1;
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}
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if (fd == NULL) {
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fprintf(stderr, "can't open file '%s'\n", DATA);
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return 1;
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}
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readnum(fd, str, N_CHARS);
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for(i=0; i < N_CHARS-5; i++) {
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tmp = product(&str[i], 5);
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if (tmp > r)
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