Now reads a file and obtains its numbers.

src/Main.c

@@ -5,20 +5,38 @@
 #include <getopt.h>
 #include <unistd.h>
 
+// Version string
 const char *version = "v0.5";
-bool helpFlag = false;
-bool versionFlag = false;
+// Whether or not the calculations should be verbose
 bool verboseFlag = false;
-char *infile = NULL;
 
+// Function that prints help info
 inline void printHelp();
 
 int main(int argc, char **argv) {
+    // There should always be at least be 2 arguments and no more than 4
+    if(argc <= 1) {
+        fprintf(stderr, "No arguments were provided. Use `-h' for help.\n");
+        return 1;
+    }
+
+    // Variable where the argument is stored
     int arg;
+    // If help info should be printed
+    bool helpFlag = false;
+    // If version info should be printed
+    bool versionFlag = false;
+    // The file to read the numbers from
+    char *infile = NULL;
 
     while((arg = getopt(argc, argv, "hvVf:")) != -1) {
         switch(arg) {
             case 'h':
+                // Only 2 arguments can be used
+                if(argc != 2) {
+                    fprintf(stderr, "Invalid use of arguments. Use `-h' for help.\n");
+                    return 1;
+                }
                 helpFlag = true;
                 break;
 
@@ -27,10 +45,20 @@ int main(int argc, char **argv) {
                 break;
 
             case 'V':
+                // Only 2 arguments can be used
+                if(argc != 2) {
+                    fprintf(stderr, "Invalid use of arguments. Use `-h' for help.\n");
+                    return 1;
+                }
                 versionFlag = true;
                 break;
 
             case 'f':
+                // There needs to be between 3 and 4 arguments
+                if(argc > 4 || argc < 3) {
+                    fprintf(stderr, "Invalid use of arguments. Use `-h' for help.\n");
+                }
+                // Set the input file
                 infile = optarg;
                 break;
 
@@ -45,6 +73,7 @@ int main(int argc, char **argv) {
                 return 1;
 
             default:
+                // If we get anything else that's weird just abort
                 abort();
         }
     }
@@ -57,10 +86,35 @@ int main(int argc, char **argv) {
         return 0;
     }
 
+    // Print copyright & license information
     printf("MMMCalc %s, Copyright (c) 2016 Nicolás A. Ortega.\n", version);
     printf("This program comes with ABSOLUTELY NO WARRANTY.\n");
     printf("This program is free software and you are welcome to redistribute\n");
     printf("under the terms and conditions of the GNU GPLv3 or higher.\n\n");
+
+    // Open a file as read only
+    FILE *numfile = fopen(infile, "r");
+    // Temporary variable to see how many numbers are in this file
+    double num;
+    // The size of the coming nums array
+    int size = 0;
+    // Get the size for the array
+    while(fscanf(numfile, "%lf", &num) == 1) size++;
+    rewind(numfile);
+    printf("There are %d numbers in the file.\n", size);
+    // Create the array with that size
+    double nums[size];
+    for(int i = 0; i < size; i++) {
+        // Store result of fscanf in err
+        int err = fscanf(numfile, "%lf", &nums[i]);
+        // If fscanf returned error exit out of here
+        if(err != 1) {
+            fprintf(stderr, "Error reading entire file.\n");
+            return 1;
+        }
+        // If not let's continue printing
+        printf("%f\n", nums[i]);
+    }
     return 0;
 }