add Compression ratio

main.cpp

@@ -170,8 +170,11 @@ int main(){
     Huffman Huffman1(a);
     char b[800]={'\0'};
     char c[100]={'\0'};
+    int nb = -1,nc = -1;
     Huffman1.Encode(a,b);
     Huffman1.Decode(b,c);
+    while(b[++nb] != '\0');
+    while(c[++nc] != '\0');
     system(CLEAR);
     cout <<"+----------------------------+"<<endl;
     cout <<"|          哈弗曼树实现        |"<<endl;
@@ -185,6 +188,12 @@ int main(){
     cout <<"|"<<setw(28)<<setiosflags(ios::left)<<c<<"|"<<endl;
     cout <<"|        按Enter进入菜单       |"<<endl;
     cout <<"+----------------------------+"<<endl;
+    cout <<"编码前长度"<<endl;
+    cout << nc*8 << endl;
+    cout << "编码后长度" <<endl;
+    cout << nb << endl;
+    cout << "压缩率" << endl;
+    cout << (double)nb/(nc*8) << endl;
     cin.get();cin.get();
     int chouse;
     goback:;