diff --git a/main/arr_xor/func.c b/main/arr_xor/func.c
new file mode 100644
index 0000000..b006750
--- /dev/null
+++ b/main/arr_xor/func.c
@@ -0,0 +1,115 @@
+#include "head.h"
+
+void node_print(Node *n)
+{
+    while (n != NULL)
+    {
+        printf("%s\n", n->name);
+        n = n->next;
+    }
+}
+
+Node get(Node *node, int n)
+{
+    int i;
+    for (i = 0; i < n; i++)
+    {
+        node = node->next;
+    }
+    return *node;
+}
+
+int len(Node *n)
+{
+    int res = 0;
+    while (n != NULL)
+    {
+        res++;
+        n = n->next;
+    }
+    return res;
+}
+
+Node *xor_find(Node *n1, Node *n2)
+{
+    int i, j, f = 0;
+    Node *res = NULL;
+    if ((res = malloc(sizeof(Node))) == NULL)
+    {
+        printf("could not malloc\n");
+        exit(3);
+    }
+
+    for (i = 0; i < len(n1); i++)
+    {
+        Node tmp1 = get(n1, i);
+        for (j = 0; j < len(n2); j++)
+        {
+            Node tmp2 = get(n2, j);
+            if (strcmp(tmp1.name, tmp2.name) == 0)
+            {
+                f = 1;
+            }
+        }
+        if (f == 0)
+        {
+            Node tmp = get(n1, i);
+            res = add_tail(res, tmp.name);
+        }
+        f = 0;
+    }
+
+    for (i = 0; i < len(n2); i++)
+    {
+        Node tmp2 = get(n2, i);
+        for (j = 0; j < len(n1); j++)
+        {
+            Node tmp1 = get(n1, j);
+            if (strcmp(tmp2.name, tmp1.name) == 0)
+            {
+                f = 1;
+            }
+        }
+        if (f == 0)
+        {
+            Node tmp = get(n2, i);
+            res = add_tail(res, tmp.name);
+        }
+        f = 0;
+    }
+
+    return res;
+}
+
+Node *add_tail(Node *n, char s[])
+{
+    if (n == NULL)
+    {
+        if ((n = malloc(sizeof(Node))) == NULL)
+        {
+            printf("could not malloc\n");
+            exit(1);
+        }
+        n->next = NULL;
+        n->prev = NULL;
+        memcpy(n->name, s, LEN);
+        return n;
+    }
+    if (!strcmp(n->name, "\0"))
+    {
+        memcpy(n->name, s, LEN);
+        n->next = NULL;
+        n->prev = NULL;
+        return n;
+    }
+
+    Node *res = n;
+    while (n->next != NULL)
+        n = n->next;
+
+    Node *tmp = malloc(sizeof(Node));
+    memcpy(tmp->name, s, LEN);
+    tmp->prev = n;
+    n->next = tmp;
+    return res;
+}
diff --git a/main/arr_xor/head.h b/main/arr_xor/head.h
new file mode 100644
index 0000000..fdd9b33
--- /dev/null
+++ b/main/arr_xor/head.h
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#define N 3
+#define LEN 3
+
+typedef struct Node {
+    struct Node* next;
+    struct Node* prev;
+    char name[LEN];
+} Node;
+
+void node_print(Node* n);
+Node get(Node* node, int n);
+Node* xor_find(Node* n1, Node* n2);
+Node* add_tail(Node* n, char s[]);
\ No newline at end of file
diff --git a/main/arr_xor/main.c b/main/arr_xor/main.c
new file mode 100644
index 0000000..e425e3c
--- /dev/null
+++ b/main/arr_xor/main.c
@@ -0,0 +1,50 @@
+#include "head.h"
+
+int main(int argc, char *argv[])
+{
+    srand(time(0));
+    Node *n1 = NULL;
+    Node *n2 = NULL;
+    Node *n3 = NULL;
+    if ((n1 = malloc(sizeof(Node))) == NULL ||
+        (n2 = malloc(sizeof(Node))) == NULL ||
+        (n3 = malloc(sizeof(Node))) == NULL)
+    {
+        printf("Could not malloc\n");
+        exit(2);
+    }
+
+    int i;
+    for (i = 0; i < N; i++)
+    {
+        char s[LEN];
+        int j;
+
+        for (j = 0; j < LEN - 1; j++)
+            s[j] = 'a' + rand() % 2;
+        s[LEN - 1] = '\0';
+
+        n1 = add_tail(n1, s);
+
+        for (j = 0; j < LEN - 1; j++)
+            s[j] = 'a' + rand() % 2;
+        s[LEN - 1] = '\0';
+        n2 = add_tail(n2, s);
+    }
+
+    printf("Begin arrays:\n");
+    node_print(n1);
+    printf("\n");
+    node_print(n2);
+
+    n3 = xor_find(n1, n2);
+
+    printf("\nFinal array:\n");
+    node_print(n3);
+
+    free(n1);
+    free(n2);
+    free(n3);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/main/arr_xor/xorApp.exe b/main/arr_xor/xorApp.exe
new file mode 100644
index 0000000..b0a5c95
Binary files /dev/null and b/main/arr_xor/xorApp.exe differ
diff --git a/main/zero_finder/main.c b/main/zero_finder/main.c
new file mode 100644
index 0000000..3a96e9f
--- /dev/null
+++ b/main/zero_finder/main.c
@@ -0,0 +1,41 @@
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+double func(double x) 
+    { 
+        return exp(x*5.8) + sin(x+3.5); 
+    }
+
+int main(int argc, char *argv[])
+{
+    srand(time(0));
+
+    double start = -5.6, finish = -1.0, e = 1e-6, mid = (finish + start) / 2.0;
+
+    if (func(start) * func(finish) > 0)
+    {
+        printf("Couldn`t find\n");
+        exit(0);
+    }
+
+    while (fabs(func(mid)) >= e)
+    {
+        mid = (finish + start) / 2.0;
+        if (func(mid) > 0)
+        {
+            start = (func(start) > func(finish)) ? mid : start;
+            finish = (func(start) < func(finish)) ? mid : finish;
+        }
+        else
+        {
+            start = (func(start) < func(finish)) ? mid : start;
+            finish = (func(start) > func(finish)) ? mid : finish;
+        }
+    }
+
+    printf("Zero: %lF\n", start);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/main/zero_finder/main.exe b/main/zero_finder/main.exe
new file mode 100644
index 0000000..20bbd73
Binary files /dev/null and b/main/zero_finder/main.exe differ