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help me with this simple program

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help me with this simple program, urgent

EquinoX	1 Feb, 2008 - 02:17 PM Post #1
D.I.C Head Joined: 19 Jan, 2007 Posts: 63 My Contributions	I have a program called donut.c and the code is like this: CODE #include <stdio.h> int main() { double dozen_donut_cost; int donuts_eaten; int i = 0; double donuts_cost; return 0; } then when I want to execute donut, the instruction is: ./donut < t0 where the file t0 contains: 3.00 12 .5 .5 .5 .5 .5 .75 .75 .75 .75 1.0 1.0 1.0 how do I assign the variable dozen_donut_cost so that it equals 3.00? Which is the first value in file?? Thanks
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PennyBoki	RE: Help Me With This Simple Program 1 Feb, 2008 - 02:37 PM Post #2
system("revolution"); Joined: 11 Dec, 2006 Posts: 2,011 Thanked: 7 times Dream Kudos: 500 Expert In: Java,C++,C My Contributions	Hi, check this tutorial: http://www.cprogramming.com/tutorial/cfileio.html
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EquinoX	RE: Help Me With This Simple Program 1 Feb, 2008 - 02:39 PM Post #3
D.I.C Head Joined: 19 Jan, 2007 Posts: 63 My Contributions	QUOTE(PennyBoki @ 1 Feb, 2008 - 03:37 PM) Hi, check this tutorial: http://www.cprogramming.com/tutorial/cfileio.html hey I checked your tutorial and I still don't get it how do I assign it to a variable
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PennyBoki	RE: Help Me With This Simple Program 1 Feb, 2008 - 03:14 PM Post #4
system("revolution"); Joined: 11 Dec, 2006 Posts: 2,011 Thanked: 7 times Dream Kudos: 500 Expert In: Java,C++,C My Contributions	OK. is the file like this: 1 2 3 4 or 1 2 3 4 ?And Here is what you do: read from the file using some sort of loop. The condition is reaching the end of the file. Use the functions like fgets OR fgetc, then cast from char* to double.
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EquinoX	RE: Help Me With This Simple Program 1 Feb, 2008 - 03:18 PM Post #5
D.I.C Head Joined: 19 Jan, 2007 Posts: 63 My Contributions	QUOTE(PennyBoki @ 1 Feb, 2008 - 04:14 PM) OK. is the file like this: 1 2 3 4 or 1 2 3 4 ?And Here is what you do: read from the file using some sort of loop. The condition is reaching the end of the file. Use the functions like fgets OR fgetc, then cast from char* to double. the file is like 1 2 3 4 and does main has to take an arguments? what will the main arguments be like?
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PennyBoki	RE: Help Me With This Simple Program 1 Feb, 2008 - 03:50 PM Post #6
system("revolution"); Joined: 11 Dec, 2006 Posts: 2,011 Thanked: 7 times Dream Kudos: 500 Expert In: Java,C++,C My Contributions	An example that should get you started: http://www.cprogramming.com/tutorial/c/lesson14.html
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musya	RE: Help Me With This Simple Program 1 Feb, 2008 - 03:53 PM Post #7
D.I.C Regular Joined: 25 Apr, 2007 Posts: 296 Thanked: 1 times Dream Kudos: 50 My Contributions	probably pass in a char array (char[]) into main, and then loop through that and select the first number or the numbers that are before the first ' ' (space) and then assign them to dozen_donut_cost.
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EquinoX	RE: Help Me With This Simple Program 1 Feb, 2008 - 04:27 PM Post #8
D.I.C Head Joined: 19 Jan, 2007 Posts: 63 My Contributions	QUOTE(musya @ 1 Feb, 2008 - 04:53 PM) probably pass in a char array (char[]) into main, and then loop through that and select the first number or the numbers that are before the first ' ' (space) and then assign them to dozen_donut_cost. say that I want to leave main as int main(), but when I execute the program I would like it to be able to do ./donut 3.0 and I want to get the value of 3.0
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musya	RE: Help Me With This Simple Program 1 Feb, 2008 - 10:36 PM Post #9
D.I.C Regular Joined: 25 Apr, 2007 Posts: 296 Thanked: 1 times Dream Kudos: 50 My Contributions	As far as I know you need main to take in an argument in order for that to work that way, but if I'm wrong somebody correct me please.
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