|May11-10, 06:11 PM||#1|
How to read this file line by line and store contents in an array
In my computational science class I have the task of taking the following input file and manipulating it.
I have the following input file:
C1 0 0.00 0 000.0 0 000.0
O2 1 1.22 0 000.0 0 000.0
H3 1 1.09 2 120.0 0 000.0
C4 1 1.54 2 120.0 3 180.0
H5 4 1.09 1 110.0 2 000.0
H6 4 1.09 1 110.0 2 120.0
H7 4 1.09 1 110.0 2 -120.0
stored as input.txt. I need to open this file, read each line, and store each line as an element in an array. Is this even possible in C? I am used to Java, where I could have stored each line as a string object, but in C I have no idea.
After that , I need to be able to access each element in this array, open an element, and tokenize it by space delimiter.
Can someone please show me a code example of how this is done? I have spent several days browsing the internet looking for help in how this works, but I have had no such success. I'm really demoralized right now.
|May11-10, 06:15 PM||#2|
Oh, this is the code I have so far (not much, I know!):
int main ()
FILE* input; //file pointer to input file
FILE* output; //file pointer to output file
input = fopen("input.txt", "r"); //open input file to read
output = fopen("output.txt", "w"); //open output file to write
if (input == NULL)
fprintf(output, "Error opening file.");
|May11-10, 10:50 PM||#3|
If your C++ compiler supports <iostream>, you can use getline() to retrieve lines. There's also a <string> version of getline() if your compiler supports standard template libarary. If this is C and not C++, on a modern PC, you probably have enough ram to be able to allocate a large amount of memory (malloc()), read the entire file into memory, after which you can use memchr() to scan the buffered data for line terminators.
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