accumulate example

 #include  <numeric>

 int  main()  {
     double  a[ ]  =  {1.2,  2.3,  3.4,  4.5,  5.6};
     string  s[ ]  =  {"abc",  "def",  "ghi",  "jkl"};
     cout  <<  accumulate(a,  a+5,  0.0)
              <<  endl;
     cout  <<  accumulate(s,  s+4,  string())
              <<  endl;
 }