fixed smuos#2 which is add a function, mean(), to mm.c to calculate t…

…he mean

mm.c

@@ -0,0 +1,70 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#define debug 0
+
+
+//Declare variables
+double sum=0;
+
+// Comparison function for qsort()
+int numcmp (const void *a, const void *b) {
+    int x = *((int*) a);
+    int y = *((int*) b);
+    if (x > y) return 1;
+    if (x < y) return -1;
+    return 0;
+}
+
+// Find mean
+double mean(int* num, int size) {
+    // Read all numbers
+    int i;
+    for (i=0; i<=size-1; i++) {
+    	//add all numbers
+    	sum += num[i];
+    }
+    // Calculate meas
+    int mean = sum / size;
+    return mean;	
+}
+
+int main(int argc, char *argv[]) {
+
+    int i, length, *pt;
+
+    // Check for proper usage
+    if (argc < 2) {
+        fprintf(stderr, "%s: Aborting, not enough arguments.\n", argv[0]);
+        return (-1);
+    }
+
+    // Determine amount of numbers from argc
+    length = argc - 1;
+#if debug
+    fprintf(stderr, "%s: DEBUG: %d numbers were passed.\n", argv[0], length);
+#endif
+
+    // Allocate memory for array of number (and error check)
+    if ((pt = malloc(length * sizeof(int))) == NULL) {
+        fprintf(stderr, "%s: Could not allocate memory.\n", argv[0]);
+        return -1;
+    }
+
+    // Read numbers into array
+    for (i = 0; i < length; i++) {
+        pt[i] = (int) strtol(argv[i+1], NULL, 10);
+    }
+
+    // Sort numbers
+    qsort(pt, length, sizeof(int), numcmp); 
+
+    // Print out numbers
+    fprintf(stdout, "%s: Sorted output is: \n", argv[0]);
+    for (i=0; i<length; i++) {
+        fprintf(stdout, "%d ", pt[i]);
+    }
+    fprintf(stdout, "\n%s: FIN. \n", argv[0]);
+
+    return 0;
+}