关于返回值的存活期问题，我最近困了，请同志们帮忙，两个程序如下：
(一）：#include<iostream>
         using namespace std;
         struct sysop
         {
            char name[20];
            char quote[64];
            int used;
          };
          const sysop & use (sysop & sysopref);//function with a reference return type
          int main()
          {
            sysop looper={"rick \"fortran\"looper",
                           "i'm a goto kind of guy.",
                             0
                          };
            use (looper);//looper is a type sysop
            cout <<"looper :"<<looper.used<<"use(s)\n";
            return 0;
            }
           //use ()returns the reference passed to it
           const sysop & use(sysop & sysopref)
            {
              sysop newguy;
              newguy=sysopref;
              return newguy;
             }
但是上述程序的use却不可用，原因是函数返回一个临时变量（newguy)的引用，函数运行完毕后，它将不复存在;请看（二）：
            #include<iostream>
            using namespace std;
            int value(int,int);
            int main()
             {
               int a=3,b=4,c;
               c=value(a,b);
               cout<<c;
               return 0;
              }
             int value(int a,int b)
             {
                c=a+b;
                return c;
             }              
          但是次程序却得到了结果，我想这两个程序都是在子函数中定义了一个数据，它们都是在调用后被释放了，为什一个可以得到返回值，而另一个却没有得到返回值呢？+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++