diff --git a/Basic_1.c b/Basic_1.c
index 5f89310..72aabe1 100644
--- a/Basic_1.c
+++ b/Basic_1.c
@@ -1,3 +1,21 @@
 // TASK
 // Write code to find if the number is even or odd
 // Code Below
+#include<stdio.h>
+#include<conio.h>
+void main()
+{
+  clrscr();
+  int a,b,c;
+  printf("enter the no. to find out whether it is even or odd");
+  scanf("%d",&a);
+  if(a%2==0)
+  {
+    printf("no. is even");
+  }
+  else
+  {
+    printf("no. is odd"0);
+  }
+  getch();
+}
diff --git a/Basic_12.c b/Basic_12.c
index 81bcbae..4227168 100644
--- a/Basic_12.c
+++ b/Basic_12.c
@@ -1,3 +1,15 @@
 // TASK
 // Write code to find cube of a number
 // Code Below
+#include<stdio.h>
+#include<conio.h>
+void main()
+{
+   clrscr();
+   int a,b=0,c;
+   printf("enter the no to take out its cube = ");
+   scanf("%d",&a);
+   b=a*a*a;
+   printf("cube of no. is = %d",b);
+  getch();
+}  
diff --git a/Challenge_15.c b/Challenge_15.c
index dfda9d1..0a3c37b 100644
--- a/Challenge_15.c
+++ b/Challenge_15.c
@@ -1,14 +1,14 @@
 #include <stdio.h>
 int main()
 {
-   int num1, num2, flag_var, i, j;
+   int num1, num2, num3, flag_var, i, j;
 
    printf("Enter two range(input integer numbers only):");
 
-   scanf("%d %d", &num1, &num2);
+   scanf("%d %d %d", &num1, &num2 , &num3);
 
 
-   printf("Prime numbers from %d and %d are:\n", num1, num2);
+   printf("Prime numbers from %d and %d are:\n", num1, num2, num3);
 
    //CODE