This is my second question for this code. this code comes from a modified script on page 66 of "Sams Teach Yourself C Programming" 7th edition. After copying the script out of the book, I modified it (just a little) to make it more interesting.
- I added some additional constants and variables and such to enable it to accept a larger input/output value.
- because the input/output is type "unsigned long int", which has a range of 0 - 2147483647, I set that to be the LIMIT.
- Then I added an "else" at the very end of the program to deal with all inputs above that value. I just wanted to do an experiment to see if it would register, values that exceeded the range.
- the first time I posted a question about a math error in the code that I had failed to find on my own. That was resolved.
Here are some sample outputs:
[bad_cat@KittyLitter LearningCode]$ gcc SamsC.04.seconds.c
[bad_cat@KittyLitter LearningCode]$ ./a.out
Enter the number of seconds ( > 0, < 2147483647 ):
2147483646
2147483646 seconds is equal to 68 y 35 d, 3 h, 14 m, and 6 s
[bad_cat@KittyLitter LearningCode]$ ./a.out
Enter the number of seconds ( > 0, < 2147483647 ):
2147483647
2147483647 seconds is equal to [bad_cat@KittyLitter LearningCode]$ ./a.out
Enter the number of seconds ( > 0, < 2147483647 ):
2147483650
-2147483646 seconds is equal to error: -2147483646 is an excessive amount of seconds.
range for seconds must be between 0 and 2147483647!
If number of seconds exceeds 2147483647, then it is beyond range for type 'int'.
EXITING seconds program.
[bad_cat@KittyLitter LearningCode]$ ./a.out
Enter the number of seconds ( > 0, < 2147483647 ):
9876543210
1286608618 seconds is equal to 40 y 291 d, 7 h, 16 m, and 58 s
[bad_cat@KittyLitter LearningCode]$
Here's the code:
/* Illustrates the modulus operator. */
/* inputs a number of seconds, and converts to hours, minutes, and seconds. */
// minute = 60 seconds : 60
// hour = 60 * 60 seconds : 3600
// day = 24 * 60 * 60 seconds : 86400
// year = 365 * 24 * 60 * 60 seconds : 31536000
#include <stdio.h> // from original script
/* Define constants */
#define SECS_PER_MIN 60 // from original script
#define MIN_PER_HOUR 60
#define HOURS_PER_DAY 24
#define DAYS_PER_YEAR 365
#define SECS_PER_YEAR 31536000
#define SECS_PER_HOUR 3600 // from original script
#define SECS_PER_DAY 86400
#define LIMIT 2147483647
unsigned seconds, minutes, hours, days, years, secs_remain, mins_remain, hours_remain, days_remain; // modified from original script
int main(void) // from original script
{
seconds = minutes = hours = days = years = secs_remain = mins_remain = hours_remain = days_remain = 0;
/* Input the number of seconds. */
printf( "Enter the number of seconds ( > 0, < %d ): \n", LIMIT ); // modified from original script
scanf( "%d", &seconds ); // from original script
years = seconds /SECS_PER_YEAR;
days = seconds / SECS_PER_DAY;
hours = seconds / SECS_PER_HOUR; // from original script
minutes = seconds / SECS_PER_MIN; // from original script
days_remain = days % DAYS_PER_YEAR;
hours_remain = hours % HOURS_PER_DAY;
mins_remain = minutes % MIN_PER_HOUR; // modified from original script
secs_remain = seconds % SECS_PER_MIN; // from original script
printf( "%d seconds is equal to ", seconds ); // from original script
if ( seconds < SECS_PER_HOUR )
{
printf( "%d m, and %d s\n", minutes, secs_remain );
return 0;
}
else if((seconds >= SECS_PER_HOUR ) && (seconds < SECS_PER_DAY ))
{
printf( "%d h, %d m, and %d s\n", hours, mins_remain, secs_remain ); // from original script
return 0; // from original script
}
else if((seconds >= SECS_PER_DAY ) && (seconds < SECS_PER_YEAR ))
{
printf( "%d d, %d h, %d m, and %d s\n", days, hours_remain, mins_remain, secs_remain );
return 0;
}
else if((seconds >= SECS_PER_YEAR ) && (seconds < LIMIT ))
{
printf( "%d y %d d, %d h, %d m, and %d s\n", years, days_remain, hours_remain, mins_remain, secs_remain );
return 0;
}
else if(seconds > LIMIT )
{
printf("error: %d is an excessive amount of seconds.\n", seconds);
printf("range for seconds must be between 0 and %d!\n", LIMIT );
printf("If number of seconds exceeds %d, then it is beyond range for type 'int'.\n", LIMIT );
printf("EXITING seconds program. \n");
return 1;
}
}
Thanks, I've changed all "%d" to "%u" and Limit.
I've also put this together for future reference:
#include <stdio.h>
#include <limits.h>
int main(void)
{
printf("\n");
printf("The number of bits in a byte =\t\t\t\t %d\n", CHAR_BIT);
printf("The maximum number of bytes in a multi-byte character =\t %d\n", MB_LEN_MAX);
printf("The minimum value of SIGNED CHAR =\t\t\t %d\n", SCHAR_MIN);
printf("The maximum value of SIGNED CHAR =\t\t\t %d\n", SCHAR_MAX);
printf("The maximum value of UNSIGNED CHAR =\t\t\t %d\n", UCHAR_MAX);
printf("The minimum value of SHORT INT =\t\t\t %d\n", SHRT_MIN);
printf("The maximum value of SHORT INT =\t\t\t %d\n", SHRT_MAX);
printf("The maximum value for an UNSIGNED SHORT INT =\t\t %u\n", USHRT_MAX);
printf("The minimum value of INT =\t\t\t\t %d\n", INT_MIN);
printf("The maximum value of INT =\t\t\t\t %d\n", INT_MAX);
printf("The maximum value for an UNSIGNED INT =\t\t\t %u\n", UINT_MAX);
printf("The minimum value of CHAR =\t\t\t\t %d\n", CHAR_MIN);
printf("The maximum value of CHAR =\t\t\t\t %d\n", CHAR_MAX);
printf("The minimum value of LONG =\t\t\t\t %ld\n", LONG_MIN);
printf("The maximum value of LONG =\t\t\t\t %ld\n", LONG_MAX);
printf("The maximum value for an UNSIGNED LONG INT =\t\t %Lu\n", ULONG_MAX);
printf("\n");
return(0);
}
