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    <p>The following code will read a file a line at a time</p> <pre><code>char line[80] FILE* fp = fopen("data.txt","r"); while(fgets(line,1,fp) != null) { // do something } fclose(fp); </code></pre> <p>You can then tokenise the input using <a href="http://msdn.microsoft.com/en-us/library/2c8d19sb(VS.71).aspx" rel="noreferrer">strtok()</a> and <a href="http://msdn.microsoft.com/en-us/library/zkx076cy(VS.71).aspx" rel="noreferrer">sscanf()</a> to convert the text to numbers.</p> <p>From the MSDN page for sscanf:</p> <blockquote> <p>Each of these functions [sscanf and swscanf] returns the number of fields successfully converted and assigned; the return value does not include fields that were read but not assigned. A return value of 0 indicates that no fields were assigned. The return value is EOF for an error or if the end of the string is reached before the first conversion.</p> </blockquote> <p>The following code will convert the string to an array of integers. Obviously for a variable length array you'll need a list or some scanning the input twice to determine the length of the array before actually parsing it.</p> <pre><code>char tokenstring[] = "12 23 3 4 5"; char seps[] = " "; char* token; int var; int input[5]; int i = 0; token = strtok (tokenstring, seps); while (token != NULL) { sscanf (token, "%d", &amp;var); input[i++] = var; token = strtok (NULL, seps); } </code></pre> <p>Putting:</p> <pre><code>char seps[] = " ,\t\n"; </code></pre> <p>will allow the input to be more flexible.</p> <p><em>I had to do a search to remind myself of the syntax - I found it <a href="http://msdn.microsoft.com/en-us/library/c37dh6kf(VS.71).aspx" rel="noreferrer">here in the MSDN</a></em></p>
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    1. POhow to tokenize string to array of int in c?
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    1. COcould you show me how to use sscanf() for a unknown total of numbers per line in order to parse it to an array?
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    2. CO@ChrisF the idea i found here is to use int var for temporary use, btw, thank you very much.
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