Update 1.1.2 已知sqrt(2)约等于1.414，要求不用数学库，求sqrt(2)精确到小数点后10位.md

mid*mid < 2 是错误的，应该是mid * mid > 2.

Author: zhiyong0804

1.1.2 已知sqrt(2)约等于1.414，要求不用数学库，求sqrt(2)精确到小数点后10位.md

@@ -25,8 +25,8 @@ double sqrt2( ){
     double low = 1.4, high = 1.5;
     double mid = (low + high) / 2;
     
-    while (high – low > EPSINON){
-        if (mid*mid < 2){
+    while (high - low > EPSINON){
+        if (mid*mid > 2){
             high = mid;
         }
         else{