I have been told not to use an array, so I have been trying to avoid an array and would also like to keep the file short.
I have 20 files with a random number of values in each, and need to do the same calculations to each file and print them at the end of the code. I've been trying to use a for loop to generate the file number e.g.
Last edited by awb8.; 11-28-2010 at 05:43 PM.
Ok that can work... but you need an extra step in there... fopen doesn't understand text formatting....Originally Posted by awb8.
In the interests of clarity you may want to make your file processing into a function call and call it from the spot marked but there's nothing wrong with doing it all in one big loop.Code:char fName[16]; for (z=10; z<21; z++) // assuming numbers from 10 to 20 inclusive { sprintf(fName,"data-%d.txt",z); infile = fopen(fName "r"); if (infile == NULL) { printf("Can't open %s \n",fName); system("pause"); exit(1); } // process your data here } // end of for loop
Thank you I will try that now. Can you just explain one thing for me.
Why in your post earlier did you use:
char fName[64]
but in your last post you used
char fName[16]
I have never used the char function before and am a little confused by it
char is not a function, it's a Type... 1 signed Byte, typically 8 bits.
In C strings are just arrays of characters. So declaring a char array of 16 elements, means you can store a 15 character string... That is 15 plus the trailing 0 that all C strings must have.
This might help... http://www.cprogramming.com/tutorial/c/lesson9.html
In my original post I had not seen the filename to know it's length. I used 64 on a "guesstimate" of the likely maximum. In the second post, where I did see the filename, I used 16 which is the 11 character name you specified plus a little extra.
Last edited by CommonTater; 11-28-2010 at 10:34 AM.
OK I have got everything to ALMOST work. i can get the desired output for 1 of 2 things.
I can get the correct calculation for either the correct amount of samples of all the files
OR
the correct amplitude of all the files.
Can you see where my error is? or any advice on how to sort this problem?
Last edited by awb8.; 11-28-2010 at 05:42 PM.
