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    <p>The format is similar to .obj format, which is not too hard to parse. You had it pretty good; your errors are mostly just typos at this point.</p> <p>Just use data in-place instead of pointers:</p> <pre><code>Vertex *vert[4]; </code></pre> <p>becomes:</p> <pre><code>Vertex vert[4]; </code></pre> <p>You'll also need to change all of your '->' notations to dot (.) notation, e.g:</p> <pre><code> tetrahedron[n].vert[0]=vert_std[ tetrahedron[n].vertid[0] ]; // retriving coords from the standard file and storing tetrahedron[n].vert[1]=vert_std[ tetrahedron[n].vertid[1] ]; // them in the vertex pointer array of tretrahedron tetrahedron[n].vert[2]=vert_std[ tetrahedron[n].vertid[2] ]; tetrahedron[n].vert[3]=vert_std[ tetrahedron[n].vertid[3] ]; </code></pre> <p>and your testing code should bring n back down one (it's currently lastLine+1):</p> <pre><code> // printing 13 variables in total... n--; // n must be last entry </code></pre> <p>Finally, I got a compile error on your allocations, and had to type cast them:</p> <pre><code>Vertex *vert_dt = (Vertex*) malloc( MAX * sizeof (Vertex) ) ; Vertex *vert_std = (Vertex*) malloc( MAX * sizeof (Vertex) ) ; Tetra *tetrahedron = (Tetra*) malloc(MAX * sizeof (Tetra) ); </code></pre> <p>Note that fscanf() is pretty strict, so an input file with, say, extra leading spaces might confuse the program. I tested these changes on made-up files, so no guarantees.</p> <p>Hope this helps! Here's my full file:</p> <pre><code>#define FILEPATHtri "grid1DT.txt" #define FILEPATHorg "grid1.txt" #define MAX 10000 #include &lt;assert.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include "math.h" typedef struct { float x; float y; float z; char ID; }Vertex; /* NOT USED ATM typedef struct { edge_ref next[4]; // pointers to other edges (AQE data structure) void *data[4]; // pointers to endpoints of edge unsigned ID; // ID of edge }Edge; */ typedef struct { Vertex vert[4]; int vertid[4]; char t; }Tetra; void file_link (void) { Vertex *vert_dt = (Vertex*) malloc( MAX * sizeof (Vertex) ) ; Vertex *vert_std = (Vertex*) malloc( MAX * sizeof (Vertex) ) ; Tetra *tetrahedron = (Tetra*) malloc(MAX * sizeof (Tetra) ); FILE *fp1,*fp2 ; fp1 = fopen( FILEPATHtri,"r"); int i = 0; while(fscanf(fp1, "%c %i %i %i %i ", &amp;tetrahedron[i].t, &amp;tetrahedron[i].vertid[0], &amp;tetrahedron[i].vertid[1], &amp;tetrahedron[i].vertid[2], &amp;tetrahedron[i].vertid[3] ) == 5 ) // Saving the line numbers into vertid[0..3] { i++; } fclose(fp1); fp2 = fopen( FILEPATHorg,"r"); int j = 0; while(fscanf(fp2, "%f %f %f ", &amp;vert_std[j].x, &amp;vert_std[j].y, &amp;vert_std[j].z ) == 3 ) { j++; } fclose(fp2); int n; for (n=0; n&lt;i; n++) { tetrahedron[n].vert[0]=vert_std[ tetrahedron[n].vertid[0] ]; // retriving coords from the standard file and storing tetrahedron[n].vert[1]=vert_std[ tetrahedron[n].vertid[1] ]; // them in the vertex pointer array of tretrahedron tetrahedron[n].vert[2]=vert_std[ tetrahedron[n].vertid[2] ]; tetrahedron[n].vert[3]=vert_std[ tetrahedron[n].vertid[3] ]; } int m = 100; //used to retrieve m'th tetra, so that I can print the tetra that I want,just for checking purposes.. // printing 13 variables in total... n--; // rewind to last tetrahedron printf("These are the 4 coordinates of the vertices of the %i th tetrahedron from the DT file %f %f %f\n%f %f %f\n%f %f %f\n%f %f %f\n", n, tetrahedron[n].vert[0].x,tetrahedron[n].vert[0].y,tetrahedron[n].vert[0].z, tetrahedron[n].vert[1].x,tetrahedron[n].vert[1].y,tetrahedron[n].vert[1].z, tetrahedron[n].vert[2].x,tetrahedron[n].vert[2].y,tetrahedron[n].vert[2].z, tetrahedron[n].vert[3].x,tetrahedron[n].vert[3].y,tetrahedron[n].vert[3].z); free(vert_dt); free(vert_std); free(tetrahedron); } int main(void) { file_link(); return 0; } </code></pre>
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