Update ex9_50.cpp

ch09/ex9_50.cpp

@@ -1,4 +1,4 @@
-//! @Alan
+//! @Yue Wang
 //!
 //! Exercise 9.50:
 //! Write a program to process a vector<string>s whose elements represent integral values.
@@ -10,37 +10,27 @@
 #include <string>
 #include <vector>
 
-
-int sum(const std::vector<std::string> &v);
-float sum_f(const std::vector<std::string> &v);
-
-int main()
-{
-    std::vector<std::string> v = {"1","2","3","4.5"};
-    std::cout << sum(v)<<"\n";
-    std::cout << sum_f(v);
-    return 0;
-}
-
-
-int sum(const std::vector<std::string> &v)
+int sum_for_int(const std::vector<std::string> const& v)
 {
-    int sum=0;
-    for(auto &s : v)
-    {
+    int sum = 0;
+    for (auto const& s : v)
         sum += std::stoi(s);
-    }
-
     return sum;
 }
 
-
-float sum_f(const std::vector<std::string> &v)
+float sum_for_float(const std::vector<std::string> const& v)
 {
     float sum = 0.0;
-    for(auto &s : v)
-    {
+    for (auto const& s : v)
         sum += std::stof(s);
-    }
     return sum;
 }
+
+int main()
+{
+    std::vector<std::string> v = { "1", "2", "3", "4.5" };
+    std::cout << sum_for_int(v) << std::endl;
+    std::cout << sum_for_float(v) << std::endl;
+
+    return 0;
+}