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Author Help desperatly needed from c programmers
kerzo
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19th Nov 03 at 15:45   View User's Profile U2U Member Reply With Quote

i am confused at who to go about this question for a coursework assignment and any help or even a program would be brilliant, here is the question

Construct a ‘C’ program that subtracts one time from another. You may assume that times are expressed in terms of a number of hours and a number of minutes and are in 24-hour format. For example, subtracting 1 hour 30 minutes from 1 hour 0 minutes (representing 010) should result in 23:30 being displayed (i.e. 11:30pm the previous day). The user will enter four values (the hours and minutes of each of the two times) and the program should then output the result of the subtraction in 24-hour format.

Mikorsa16v
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19th Nov 03 at 15:49   View User's Profile U2U Member Reply With Quote

right firstly you need to split up the hours and the mins, as two seperate integers and then set the 'limit' as static variables to both, i.e. the limit for hours is 24, and the limit for the mins is 60.

i was gonna say have two classes one for hours and one for mins, but C isnt OO thinking of c++.

i havent coded in C for a year now! so can only help on the structure really, as i look at past assignments lol
Tim
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19th Nov 03 at 15:53   View Garage View User's Profile U2U Member Reply With Quote

Easier to convert the dates to a standardised timestamp (number of seconds since 1900) and then perform a simple subtraction. You can then convert back to the real date answer...
Tim
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19th Nov 03 at 15:55   View Garage View User's Profile U2U Member Reply With Quote

Or construct an array for hours and an array for minutes... you could then do the maths on the array indices and return the correct value...
kerzo
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19th Nov 03 at 22:57   View User's Profile U2U Member Reply With Quote

oh so confused!!!
John_C
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19th Nov 03 at 23:32   View User's Profile U2U Member Reply With Quote

c sucks
can't get my head round it
kerzo
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19th Nov 03 at 23:41   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by John_C
c sucks
can't get my head round it


same as me pity i have another few weeks of it then onto java
John_C
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19th Nov 03 at 23:42   View User's Profile U2U Member Reply With Quote

low level bs!

i'm meant 2 b doin c++ tonight as well, thats goin marginally better but not great
kerzo
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19th Nov 03 at 23:49   View User's Profile U2U Member Reply With Quote

16/40 in a class test i got
Tim
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19th Nov 03 at 23:56   View Garage View User's Profile U2U Member Reply With Quote

One sec...
Tim
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19th Nov 03 at 23:59   View Garage View User's Profile U2U Member Reply With Quote

Apologise for rushed code but it should do the job... there are neater ways of doing this I just haven't got a function reference to hand...

code:

#include <stdio.h>
void main() {
int result, time1_h, time1_m, time2_h, time2_m;

printf("Enter 1st time hour: ");
scanf("%d", &time1_h);
printf("Enter 1st time mins: ");
scanf("%d", &time1_m);
printf("Enter 2nd time hour: ");
scanf("%d", &time2_h);
printf("Enter 2nd time mins: ");
scanf("%d", &time2_m);

result = ((60*time1_h) + time1_m) - ((60*time2_h) + time2_m);

// Fix if time becomes 'yesterday'
while (result < 0) {
result = result + 1440; // Number of minutes in a day
}

// Output result
printf("Time (1st - 2nd): %02d:%02d\n",(result / 60), (int)(result % 60));
}

Tim
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20th Nov 03 at 00:05   View Garage View User's Profile U2U Member Reply With Quote

cout << etc is C++...
Tim
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20th Nov 03 at 00:06   View Garage View User's Profile U2U Member Reply With Quote

C and C++ are not the same
Tim
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20th Nov 03 at 00:08   View Garage View User's Profile U2U Member Reply With Quote

I should make deletion of posts say "comment withdrawn"
John_C
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20th Nov 03 at 00:09   View User's Profile U2U Member Reply With Quote

fekin pointers
Tim
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20th Nov 03 at 00:09   View Garage View User's Profile U2U Member Reply With Quote

Arghhh I'm having a convo with myself
Paul_J
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20th Nov 03 at 00:11   View User's Profile U2U Member Reply With Quote

the initial joke of 'Your point?' was the fact you were talking to yourself... I had already removed mine, I know they're different - but assumed he said he was doing C++ not C, oops.

Don't put 'Post deleted' its more fun this way
Tim
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20th Nov 03 at 00:12   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by John_C
fekin pointers


They're ok once you get your head round the idea of memory and allocation etc... def worth learning properly though or else when you come to harder examples you really get stuck...
Tim
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20th Nov 03 at 00:12   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Paul_J
the initial joke of 'Your point?' was the fact you were talking to yourself... I had already removed mine, I know they're different - but assumed he said he was doing C++ not C, oops.

Don't put 'Post deleted' its more fun this way


I should have just quoted you
Paul_J
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20th Nov 03 at 00:12   View User's Profile U2U Member Reply With Quote

yes =]
kerzo
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20th Nov 03 at 00:17   View User's Profile U2U Member Reply With Quote

oh my god thank you

i would ask for more but would that just be too greedy!!!
Tim
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20th Nov 03 at 00:17   View Garage View User's Profile U2U Member Reply With Quote

No probs you wouldn't believe how bored I was

Sorry but that's ya £12.50's worth


[Edited on 20-11-2003 by Tim]
kerzo
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20th Nov 03 at 01:32   View User's Profile U2U Member Reply With Quote

at least i got good value from it

cheers tim
Dan B
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20th Nov 03 at 01:45   View User's Profile U2U Member Reply With Quote

Now there's a different usage for the whole Premium Member thing......don't suppose you fancy doing my C coding, Tim? It'll only take you about 2 months!

I'll buy Premium Membership if you do!
Jason
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20th Nov 03 at 01:53   View User's Profile U2U Member Reply With Quote

kerzo u'll love j++

 
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