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#include <stdio.h> |
#include <stdio.h> |
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#include <stdlib.h> |
#include <stdlib.h> |
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#include <limits.h> |
#include <limits.h> |
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#include <errno.h> |
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#define BOOL int |
#define BOOL int |
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#define TRUE 1 |
#define TRUE 1 |
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{ |
{ |
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int i; |
int i; |
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/* negative values are never prime numbers */ |
/* negative values, 0 and 1 are never prime numbers */ |
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if (number < 2) return FALSE; |
if (number < 2) return FALSE; |
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/* check all numbers 2..sqrt(number) for being a prime number */ |
/* check all numbers 2..sqrt(number) for being a prime number */ |
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/* convert from string to long int, with error checking */ |
/* convert from string to long int, with error checking */ |
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long int convert_number(const char *nptr) { |
long int convert_number(const char *nptr) { |
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long int number = strtol(nptr, (char **)NULL, 10); |
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if (number == LONG_MAX || number == LONG_MIN) { |
errno = 0; |
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char * endptr; |
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long int number = strtol(nptr, &endptr, 10); |
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/* invalid characters? */ |
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if (*endptr != '\0') { |
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char message[254]; |
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snprintf(message, 256, "Could not convert '%s' to a valid number.", nptr); |
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PRINTERROR(message); |
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exit(EXIT_FAILURE); |
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} |
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/* invalid range? */ |
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/* if (number == LONG_MAX || number == LONG_MIN) { */ |
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if (errno == ERANGE) { |
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char message[254]; |
char message[254]; |
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snprintf(message, 255, "Number is not in range of 'long int': %s", nptr); |
snprintf(message, 256, "Number is not in range of 'long int': %s", nptr); |
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PRINTERROR(message); |
PRINTERROR(message); |
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exit(-1); |
exit(EXIT_FAILURE); |
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} |
} |
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return number; |
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} |
} |
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int main(int argc, char * argv[]) |
int main(int argc, char * argv[]) |
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if (argc == 1) { |
if (argc == 1) { |
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PRINTERROR("No arguments given."); |
PRINTERROR("No arguments given."); |
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exit(-1); |
exit(EXIT_FAILURE); |
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} |
} |
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/* (3) range mode */ |
/* (3) range mode */ |
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if (argc > 2) { |
if (argc > 2) { |
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long int i, j; |
long int i, j; |
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i = convert_number(argv[1]); |
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j = convert_number(argv[2]); |
j = convert_number(argv[2]); |
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for (i = convert_number(argv[1]); i< j; i++) { |
for (i; i< j; i++) { |
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PRINTPRIME(i); |
PRINTPRIME(i); |
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} |
} |
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