Adding this because it took literally an hour of searching before I found a code sample using fscanf that read more than just the first line of a file.
This code assumes you're reading a file line by line that has the angle (int) followed by the Sine Value of that angle (double);
#include <stdio.h>
void main()
{
//Define the arrays for angle and sine
int a[25];
double s[25];
//Grab the filename
char* name = new char[];
printf("Load Sine Values\nFile Name: ");
gets(name);
//Create the file pointer and open it
FILE* in = fopen(name,"rt");
//Read from the file
int n = 0;
while(fscanf(in, "%i%lf", &a[n], &s[n]) == 2) n++;
//Display Proof
printf("\nLoaded %i entries from %s\n", n, name);
printf("---------------------------------------\n");
for(int k=0; k<n; k++)
{
printf("%5i%12.6f\n", a[k], s[k]);
}
//Close the file
fclose(in);
printf("Press Any Key to Continue...");
char temp[1];
gets(temp);
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