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mm.c
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mm.c
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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/wait.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;
}
// Find median
int median(int* num, int size) {
// Declare variable
int middle;
double median;
middle = size / 2.0;
// If there are even numbers of an array
if (size % 2) {
median = (num[middle]+num[middle+1])/2;
}
// If array is odd
else {
median = num[middle];
}
return median;
}
int main(int argc, char *argv[]) {
int i, length, *pt;
// Check for prioper 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]);
}
// Add fork
int rc = fork();
// Fork problem
if (rc < -1) {
fprintf(stderr,"Can't fork!\n");
}
// The child should print the median
else if (rc == 0) {
fprintf(stdout, "\nHello, I am child, I should print the median");
int child = median(pt, length);
// Print the median
fprintf(stdout, "\nMedian is: %d\n", child);
}
// The parent should print the mean
else if (rc > 0){
wait(NULL);
fprintf(stdout, "\nHello, I am parent, I should print the mean");
int parent = mean(pt, length);
// Print the mean
fprintf(stdout, "\nMean is: %d\n", parent);
}
return 0;
}