Refactor cpair and add initial forking

This commit is contained in:
Ivaylo Ivanov 2018-12-12 22:06:56 +01:00
parent ccfbf9e1ed
commit 563cced7ea
2 changed files with 84 additions and 20 deletions

View File

@ -4,7 +4,7 @@ TARGET = cpair
all: $(TARGET).c
$(CC) $(CFLAGS) $(TARGET).c
$(CC) $(TARGET).o -o $(TARGET)
$(CC) $(TARGET).o -o $(TARGET) -lm
install:
cp $(TARGET) /usr/local/bin/$(TARGET)

View File

@ -38,13 +38,28 @@
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
float get_x_mean(float *points[2], int arr_len);
/// Node struct for linked list
typedef struct node {
float points[2];
struct node * next;
} node_t;
int main () {
float get_x_mean(node_t * head);
float get_distance(float x1, float x2, float y1, float y2);
int main(void) {
char input[__UINT8_MAX__] = ""; ///< An array to save the input to
float *points[2]; ///< A pointer to a two-valued array to save the points to
int point_num = 0; ///< Save the number of points
node_t * head = NULL;
pid_t child_a, child_b;
head = malloc(sizeof(node_t));
node_t * current = head;
while(fgets(input, __INT8_MAX__, stdin) != NULL) { ///< Read line by line
/// Split the input by whitespace as delimiter
@ -52,10 +67,12 @@ int main () {
char *y = strtok(NULL, " ");
if(x != NULL && y != NULL) {
/// Convert to float and save to the array
points[point_num][0] = strtof(x, NULL);
points[point_num][1] = strtof(y, NULL);
point_num++; ///< Increase the array length
/// Convert to float and save to the list
current -> points[0] = strtof(x, NULL);
current -> points[1] = strtof(y, NULL);
current -> next = malloc(sizeof(node_t));
current = current -> next;
point_num++; ///< Increase the list length
} else {
puts("ERROR: Ill-formed line found");
exit(EXIT_FAILURE);
@ -71,28 +88,75 @@ int main () {
exit(EXIT_SUCCESS);
if(point_num == 2) {
printf("%f %f\n", points[0][0], points[0][1]);
printf("%f %f\n", points[1][0], points[1][1]);
printf("%f %f\n", head -> points[0], head -> points[1]);
printf("%f %f\n", head -> next -> points[0], head -> next -> points[1]);
exit(EXIT_SUCCESS);
}
float x_mean = get_x_mean(points, point_num);
float x_mean = get_x_mean(head);
child_a = fork();
child_b = fork();
switch(child_a){
case -1:
puts("ERROR: Coudn't fork child");
exit(EXIT_FAILURE);
case 0:
puts("Child");
break;
default:
break;
}
switch(child_b){
case -1:
puts("ERROR: Coudn't fork child");
exit(EXIT_FAILURE);
case 0:
puts("Child");
break;
default:
break;
}
int status;
waitpid(child_a, &status, 0);
waitpid(child_b, &status, 0);
exit(EXIT_SUCCESS);
}
/**
* @brief Function to calculate the mean of the X coordinates from a points array
* @details Loops through the points array, gets the sum of X coordinates and returns the mean
* @param points - a pointer to an array with the points
* point_num - number of points in the array
* @brief Function to calculate the mean of the X coordinates from a points list
* @details Loops through the points list, gets the sum of X coordinates and returns the mean
* @param head - a pointer to a list with the points
* @return mean of all X coordinates
*
**/
float get_x_mean(float *points[2], int point_num) {
float get_x_mean(node_t * head) {
node_t * current = head;
float x_sum = 0;
for(int i = 0; i< point_num; i++) {
x_sum += points[i][0];
int i = 0;
while(current -> next != NULL) {
x_sum += current -> points[0];
current = current -> next;
i++;
}
return x_sum/point_num;
}
return x_sum/i;
}
/**
* @brief Function to calculate the distance between 2 points
* @details The function calculates the distance between 2 points
* in a Cartesian coordinate system, given their coordinates
* @param x1, y1 - pair of coordinates for the first point
* x2, y2 - pair of coordinates for the second point
* @return distance between the two points
*
**/
float get_distance(float x1, float x2, float y1, float y2) {
return sqrt(pow((x2 - x1), 2) + pow((y2 - y1), 2));
}