diff --git a/add.c b/add.c
new file mode 100644
index 0000000..4613d91
--- /dev/null
+++ b/add.c
@@ -0,0 +1,8 @@
+#include<stdio.h>
+
+    printf("Enter the number of a:");
+    scanf("%d",&a);
+    printf("Enter the number of b:");
+    
+   
+}
diff --git a/add.py b/add.py
index 79aff70..2db66d8 100644
--- a/add.py
+++ b/add.py
@@ -1,5 +1,5 @@
-a=8
+a1=8
 b=4
 d=7
-c=a+b=d
+sum=a1+b=g
 print c
diff --git a/multi.c b/multi.c
new file mode 100644
index 0000000..acbf995
--- /dev/null
+++ b/multi.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+int main()
+{
+    int num1, b, sum;
+    
+    printf("Enter the first number: ");
+    scanf("%d", &num1);
+   
diff --git a/sub.c b/sub.c
new file mode 100644
index 0000000..41b69f7
--- /dev/null
+++ b/sub.c
@@ -0,0 +1,8 @@
+#include<stdio.h>
+void main()
+{
+    int a=3,b=2,c;
+    c=a-b;
+    printf("Sub c=");
+    scanf("%d",&c);
+}
\ No newline at end of file