Stop a while when have a blank line in input

babelfishUVA.cpp

@@ -0,0 +1,28 @@
+#include <bits/stdc++.h>
+#define fori(x,y) for(int i = x ; i < y ; i++)
+#define forj(x,y) for(int j = x ; j < y ; j++)
+
+using namespace std;
+
+char s[1005], ss[1005];
+string s1,s2;
+map<string, string> mp;
+
+int main()
+{
+    while(gets(s) && s[0]!='\0')
+    {
+        stringstream sss;
+        sss<<s;
+        sss>>s1;
+        sss>>s2;
+        mp[s2]=s1;
+    }
+    while(cin>>s1)
+    {
+        if(mp[s1]!="")
+        cout<<mp[s1]<<endl;
+        else
+        cout<<"eh"<<endl;
+    }
+}