diff --git a/calculateEx.java b/calculateEx.java
new file mode 100644
index 0000000..cd308ea
--- /dev/null
+++ b/calculateEx.java
@@ -0,0 +1,24 @@
+
+/**  
+ * e的x次方的泰勒展开式为
+ * e^x=1+x/1!+x^2/2!+x^3/3!+…+x^n/n! 
+**/
+ public class CalculateEx {
+   
+    public static double calcalate(int x){
+        int n=1; //n用来算阶乘
+        long f=1; //总阶乘
+        double sum=1.0,temp=1.0; //sum为最终值，temp算分子的次方
+
+        do{
+            f= f*n ;//阶乘
+            n++ ;
+            temp *= x; //计算次方
+            sum += temp / f;
+        } while(1.0/f>1e-6);
+                
+        //System.out.println("e^"+x+"="+sum);
+        return sum;
+    }
+   
+}