OpenSoure_Repos/TheAlgorithms-C
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added stdint.h for fixed width ints

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Krishna Vedala 2020-04-07 00:39:42 -04:00
parent fe5c6a724d
commit 6a09ade47d
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1 changed files with 20 additions and 20 deletions
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24
project_euler/Problem 08/sol1.c
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@ -1,15 +1,16 @@
#include <stdio.h> #include <stdio.h>
#include <stdint.h>
#include <stdlib.h> #include <stdlib.h>
int64_t get_product(FILE *fp, long start_pos, int num_digits) int64_t get_product(FILE *fp, long start_pos, int num_digits)
{ {
char ch = ' '; /* temporary variable to store character read from file */ char ch = ' '; /* temporary variable to store character read from file */
uint8_t num = 0; /* temporary variable to store digit read */ uint8_t num = 0; /* temporary variable to store digit read */
int64_t prod = 1; /* product accumulator */ int64_t prod = 1; /* product accumulator */
int count = 0; /* we use this variable to count number of bytes of file read */ int count = 0; /* we use this variable to count number of bytes of file read */
/* accumulate product for num_digits */ /* accumulate product for num_digits */
for(int i = 0; i < num_digits; i++, count++) for (int i = 0; i < num_digits; i++, count++)
{ {
/* get character from file */ /* get character from file */
ch = getc(fp); ch = getc(fp);
@ -35,7 +36,7 @@ int64_t get_product(FILE *fp, long start_pos, int num_digits)
return 0; return 0;
} }
prod *= num; /* accumulate product */ prod *= num; /* accumulate product */
} }
/* set file position to the next starting character + 1 */ /* set file position to the next starting character + 1 */
@ -44,8 +45,7 @@ int64_t get_product(FILE *fp, long start_pos, int num_digits)
return prod; return prod;
} }
int main(int argc, char *argv[])
int main(int argc, char* argv[])
{ {
int position = 0; int position = 0;
int num_digits = 4; int num_digits = 4;
@ -77,14 +77,14 @@ int main(int argc, char* argv[])
max_prod = prod; max_prod = prod;
position = ftell(fp) - 1; position = ftell(fp) - 1;
} }
} while(!feof(fp)); /* loop till end of file is reached */ } while (!feof(fp)); /* loop till end of file is reached */
printf("Maximum product: %lld\t Location: %d^th position\n\t", max_prod, position); printf("Maximum product: %lld\t Location: %d^th position\n\t", max_prod, position);
fseek(fp, position, SEEK_SET); /* move cursor to identified position in file */ fseek(fp, position, SEEK_SET); /* move cursor to identified position in file */
/* loop through all digits */ /* loop through all digits */
for (; num_digits > 0; num_digits--) for (; num_digits > 0; num_digits--)
{ {
char ch = getc(fp); /* get character */ char ch = getc(fp); /* get character */
/* skip invalid character */ /* skip invalid character */
if (ch < 0x30 || ch > 0x39) if (ch < 0x30 || ch > 0x39)
continue; continue;
@ -94,7 +94,7 @@ int main(int argc, char* argv[])
printf("%c = %lld\n", ch, max_prod); printf("%c = %lld\n", ch, max_prod);
} }
fclose(fp); /* close file */ fclose(fp); /* close file */
return 0; return 0;
} }