I use your questions to practice my new writing. You need a compiler gcc > to support the latest C++ 1 1 standard. 4.6
Compile and run.
*/
# include & ltiostream & gt
# include & lt algorithm & gt
# include & ltnumeric & gt
Use namespace std
int main(){
//randomly generate the number of 10 (VC >；; In 2008, GCC & gt3.5)
int a[ 10]；
int count = 0；
srand(time(NULL))；
generate_n(a， 10，[]{ return rand()% 20； });
for_each(a，a+ 10，[](int I){ cout & lt； & lt me<& lt''; });
cout & lt& ltendl
//method 1 range traversal (even the latest Visual C++20 12 is not supported, GCC >；; 4.6)
int sum = 0；
for(int & amp； I:a)sum+= I；
Cout & lt& lt "Total 1: "<
//Method 2 High-order reduce(VC & gt；; 6.0/98)
Cout & lt& lt "Sum 2:"
//Method 3 Recursion (VC & gt20 10)
Function & ltint(int*, int) > summfunc = [&; sumfunc](int *a，int l)-& gt； int { return l & gt 1? (*a)+sumfunc(a+ 1，l- 1):* a； };
Cout & lt& lt "3 in total:"
//Method 4 Local Sum Set (VC >；; 6.0)
int b[ 10]；
partial_sum(a，a+ 10，b)；
Cout & lt& lt "Four in total:"
Returns 0;
}
==========
19 16 9 8 6 19 12 19 9 17
Total 1: 134
Total 2: 134
Total 3: 134
Total 4: 134