diff --git a/proglabs/lab5/11.c b/proglabs/lab5/11.c
index 0d4f8cf..a1c03d2 100644
--- a/proglabs/lab5/11.c
+++ b/proglabs/lab5/11.c
@@ -1,12 +1,12 @@
 #include <stdio.h>
 
 int main() {
-    int n[9];
-    for (int i = 1; i <= 8; i++){
+    int n[8];
+    for (int i = 0; i < 8; i++){
         printf("num %d: ",i);
         scanf("%d", &n[i]);
     }
-    for (int i = 8; i > 0; --i)
+    for (int i = 7; i > 0; --i)
         printf("%d ", n[i]);
     printf("\n");
     return 0;    
diff --git a/proglabs/lab5/14.c b/proglabs/lab5/14.c
index 090f23a..9101735 100644
--- a/proglabs/lab5/14.c
+++ b/proglabs/lab5/14.c
@@ -1,6 +1,18 @@
 #include <stdio.h>
 
 int main() {
-    double a[9],b[9];
-    return 0;
+    double a[8], b[8], sum = 0.0;
+    for (int i = 0; i < 8; ++i){
+        printf("num %d: ",i);
+        scanf("%lf", &a[i]);
+        sum += a[i];
+        b[i] = sum;
+    }
+    for (int i = 0; i < 8; ++i)
+       printf("%.3lf ", a[i]);
+   printf("\n");
+    for (int i = 0; i < 8; ++i)
+       printf("%.3lf ", b[i]);
+   printf("\n");
+  return 0;    
 }
diff --git a/proglabs/lab5/15.c b/proglabs/lab5/15.c
new file mode 100644
index 0000000..a3c688e
--- /dev/null
+++ b/proglabs/lab5/15.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+int main() {
+    char c, s[256];
+    int n = 0, st = 0;
+
+    while(st == 0){
+        scanf("%c", &c);
+        st = (c == '\n');
+        s[n] = c * (1 - st);
+        n = n + (1 - st);
+    }
+
+    while(n > 0) {
+        n -= 1;
+        printf("%c", s[n]);
+    }
+    printf("\n");
+    return 0;
+}
diff --git a/proglabs/lab5/16.c b/proglabs/lab5/16.c
new file mode 100644
index 0000000..0e02972
--- /dev/null
+++ b/proglabs/lab5/16.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+    float a,b,x;
+    int c = 0;
+    a = b = x = 100;
+    do{
+        a += (x * 0.10);
+        b += (b * 0.05);
+        c++;
+    }while(a >= b);
+    printf("dafna: %.3f\ndeind: %.3f\nyear: %d",a,b,c);
+    return 0;
+}
diff --git a/proglabs/lab5/17.c b/proglabs/lab5/17.c
new file mode 100644
index 0000000..6264679
--- /dev/null
+++ b/proglabs/lab5/17.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main() {
+    int sum = 1000000;
+    int take = 100000;
+    float proc = 0.08;
+    int y = 0;
+    do{
+        y++;
+        sum -= take;
+        sum += (sum * proc);
+    }while(sum >= 0);
+
+    printf("%d",y);
+    return 0;
+}
diff --git a/proglabs/lab5/18.c b/proglabs/lab5/18.c
new file mode 100644
index 0000000..8ec428a
--- /dev/null
+++ b/proglabs/lab5/18.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+    int d = 5;
+    int max = 150;
+    int n = 0;
+    do{ 
+        printf("%d  %d\n",d,n);  
+        n++;
+        d -= n;
+        d *= 2;
+    }while(d <= max);
+    return 0;
+}
diff --git a/proglabs/lab5/<F5> b/proglabs/lab5/<F5>
new file mode 100644
index 0000000..c5d6304
--- /dev/null
+++ b/proglabs/lab5/<F5>
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main() {
+    int n[8];
+    for (int i = 0; i < 8; i++){
+        printf("num %d: ",i);
+        scanf("%d", &n[i]);
+    }
+    for (int i = 8; i >= 0; --i)
+        printf("%d ", n[i]);
+    printf("\n");
+    return 0;    
+}
diff --git a/proglabs/lab5/tmp.out b/proglabs/lab5/tmp.out
index 4912290..cf3ada2 100755
Binary files a/proglabs/lab5/tmp.out and b/proglabs/lab5/tmp.out differ