diff --git a/Sixth/exp_weigh_avg.c b/Sixth/exp_weigh_avg.c
new file mode 100644
index 0000000..d9d858f
--- /dev/null
+++ b/Sixth/exp_weigh_avg.c
@@ -0,0 +1,24 @@
+#include "exp_weigh_avg.h"
+
+int betweenZeroOne(double lambda) {
+    if ((lambda < FAULT) || ((1 - lambda) <= FAULT)) return 0;
+    return 1;
+}
+
+double expWeigthAvg(FILE * file, double lambda) {
+    double current, i, eavg, lambda_n;
+    if (fscanf(file, "%lf", &current) != 1) {
+        printf("File is empty!\n");
+        return -1.;
+    }
+
+    i = 1.;
+    eavg = 0.;
+
+    do {
+        eavg += current * pow(lambda, -i);
+        i++;
+    } while (fscanf(file, "%lf", &current) == 1);
+    lambda_n = pow(lambda, i - 1);
+    return (eavg * lambda_n) * ((1 - lambda) / (1 - lambda_n));
+}
diff --git a/Sixth/exp_weigh_avg.h b/Sixth/exp_weigh_avg.h
new file mode 100644
index 0000000..4876368
--- /dev/null
+++ b/Sixth/exp_weigh_avg.h
@@ -0,0 +1,13 @@
+#ifndef EXP_WEIGH_AVG
+#define EXP_WEIGH_AVG
+
+#include <stdio.h>
+#include <math.h>
+
+#define FALSE 0
+#define FAULT 1.e-10
+
+int betweenZeroOne(double lambda);
+double expWeigthAvg(FILE * file, double lambda);
+
+#endif // EXP_WEIGH_AVG
diff --git a/Sixth/input.txt b/Sixth/input.txt
new file mode 100644
index 0000000..8fbd720
--- /dev/null
+++ b/Sixth/input.txt
@@ -0,0 +1,5 @@
+5
+4
+3
+2
+1
\ No newline at end of file
diff --git a/Sixth/main.c b/Sixth/main.c
new file mode 100644
index 0000000..7de9e58
--- /dev/null
+++ b/Sixth/main.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include "tools.h"
+#include "exp_weigh_avg.h"
+
+/*
+Задание 38
+Пример:
+5 4 3 2 1 и лямбда: 0.5
+Ответ: 1.83...
+*/
+
+int main(void) {
+    double lambda;
+    FILE * file = getFile();
+
+    printf("Enter lambda: ");
+    scanf("%lf", &lambda);
+    if (betweenZeroOne(lambda) == FALSE) {
+        printf("Lambda is not between 0 to 1!");
+        return -1;
+    }
+
+    printf("The exponentially weighted average is %lf\n", expWeigthAvg(file, lambda));
+    return 0;
+}
diff --git a/Sixth/makefile b/Sixth/makefile
new file mode 100644
index 0000000..c9a9430
--- /dev/null
+++ b/Sixth/makefile
@@ -0,0 +1,11 @@
+all: main.o exp_weigh_avg.o tools.o
+	gcc main.o exp_weigh_avg.o tools.o && del *.o
+	
+main.o: main.c
+	gcc -c main.c
+
+exp_weigh_avg.o: exp_weigh_avg.c
+	gcc -c exp_weigh_avg.c
+	
+tools.o: tools.c
+	gcc -c tools.c
\ No newline at end of file
diff --git a/Sixth/tools.c b/Sixth/tools.c
new file mode 100644
index 0000000..3900212
--- /dev/null
+++ b/Sixth/tools.c
@@ -0,0 +1,23 @@
+#include "tools.h"
+
+FILE * getFile(void)
+{
+    FILE * file;
+    char filename[50];
+
+    printf("Enter filename: ");
+    if (scanf("%s", filename) == 1)
+    {
+        file = fopen(filename, "r");
+        if (file == NULL) {
+            printf("Error file!\n");
+            return NULL;
+        } else {
+            return file;
+        }
+    } else
+    {
+        printf("Empty name!\n");
+        return NULL;
+    }
+}
diff --git a/Sixth/tools.h b/Sixth/tools.h
new file mode 100644
index 0000000..860a2a7
--- /dev/null
+++ b/Sixth/tools.h
@@ -0,0 +1,8 @@
+#ifndef TOOLS
+#define TOOLS
+
+#include <stdio.h>
+
+FILE * getFile(void);
+
+#endif