simpleStats complete

mm.c

@@ -0,0 +1,102 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#define debug 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;
+}
+
+/* mean and median functions */
+int mean(int* pt,int length) {
+
+    int i = 0;
+    int sum = 0;
+    int mean = 0;
+    for(i = 0; i < length; i++){
+        sum = sum + pt[i];
+    }
+    mean = (sum / length);
+
+    return mean;
+}
+
+int median(int* pt,int length){
+    int middle, median;
+
+    middle = (length / 2);
+    median = pt[middle];
+
+    return median;
+
+}
+
+/* -------------------------- */
+
+int main(int argc, char *argv[]) {
+
+    int i, length, *pt;
+    /* my vars */
+    int meanVal, medianVal, wc;
+
+    // Check for proper usage
+    if (argc < 2) {
+        fprintf(stderr, "%s: Aborting, not enough arguments.\n", argv[0]);
+        return (-1);
+    }
+
+    // Determine number 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]);
+    }
+
+    // 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]);
+    }
+    */
+
+    /* Forking!!! :O */
+
+    int rc = fork();
+    if (rc < 0) {       
+        fprintf(stderr, "fork failed\n");
+        exit(1);
+    } else if (rc == 0) { 
+        medianVal = median(pt, length);
+        fprintf(stdout, "Median: %d\n", medianVal);
+    } else {
+        wc = wait(NULL);
+        meanVal = mean(pt, length);
+        fprintf(stdout, "Mean: %d\n", meanVal);
+    } 
+
+    /* That's all, folks */
+    /* fprintf(stdout, "\n%s: FIN. \n", argv[0]); */
+
+
+    return 0;
+}
+