diff --git a/C/program-40/program.c b/C/program-40/program.c
new file mode 100644
index 00000000..d9aa6b11
--- /dev/null
+++ b/C/program-40/program.c
@@ -0,0 +1,22 @@
+/*Write a C program to find the Ackermann of 2 Numbers*/
+
+#include<stdio.h>
+int ack(int m,int n)
+{
+    if(m==0)
+      return n+1;
+    else if(m!=0 && n==0)
+      return ack(m-1,1);
+    else if (m!=0 && n!=0)
+      return ack(m-1,ack(m,n-1));  
+}
+
+int main()
+{
+    int a,b,c;
+    printf("Enter 2 Elements:\n");
+    scanf("%d%d",&a&b);
+    c=ack(a,b);
+    printf("Ackermann(%d,%d)=%d",a,b,c);
+    return 0;
+}
\ No newline at end of file