🦄 refactor(C14, C15):

C15-进程/process_basic/primer2.c

@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define LEFT  30000000
+#define RIGHT 30000200
+
+/**
+ * @brief    求质数（多进程版）
+ * @details
+ *
+ * @param    argc
+ * @param    argv
+ * @return  int
+ */
+int main(int argc, char **argv)
+{
+    int   i, j, mark;
+    pid_t pid;
+
+    for (i = LEFT; i <= RIGHT; i++)
+    {
+
+        pid = fork();
+        if (pid < 0)
+        {
+            perror("fork()");
+            exit(1);
+        }
+
+        if (pid == 0)   // child
+        {
+            mark = 1;
+            for (j = 2; j < i / 2; j++)
+            {
+                if (i % j == 0)
+                {
+                    mark = 0;
+                    break;
+                }
+            }
+            if (mark)
+                printf("%d is a primer\n", i);
+
+            exit(0);   // ! 退出子进程
+        }
+    }
+
+    // int st;
+    for (i = LEFT; i <= RIGHT; i++)
+        // wait(&st);
+        wait(NULL);
+
+    exit(0);
+}