diff --git a/Computer Oriented Statistical Methods/lagrange_theorem.C b/Computer Oriented Statistical Methods/lagrange_theorem.C
new file mode 100644
index 00000000..1b4694bb
--- /dev/null
+++ b/Computer Oriented Statistical Methods/lagrange_theorem.C	
@@ -0,0 +1,45 @@
+#include<stdio.h>
+#include<conio.h>
+#include<stdlib.h>
+#include<math.h>
+void main()
+{
+	float x[20],y[20],a,sum,p;
+	int n,i,j;
+	clrscr();
+	printf("Enter the no of entry to insert->");
+	scanf("%d",&n);
+
+	for(i=0;i<n;i++)
+	{
+		printf("enter the value of x%d->",i);
+		scanf("%f",&x[i]);
+		printf("enter the value of y%d->",i);
+		scanf("%f",&y[i]);
+	}
+	printf("\n X \t\t Y \n");
+		printf("----------------------------\n");
+		for(i=0;i<n;i++)
+		{
+			printf("%f\t",x[i]);
+			printf("%f\n",y[i]);
+		}
+		printf("\nenter the value of x for interpolation:");
+		scanf("%f",&a)
+		sum=0;
+		for(i=0;i<n;i++)
+		{
+			p=1.0;
+			for(j=0;j<n;j++)
+			{
+
+			if(i !=j)
+			{
+				p=p*(a-x[j])/(x[i]-x[j]);
+			}
+			sum=sum+y[i]*p;
+		}
+		printf("ans is->%f",sum);
+		getch();
+
+}}
\ No newline at end of file