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[jianfengshxy]

    1 #include<iostream>
      2 #include<algorithm>
      3 #include<vector>
      4 using namespace std;
      5 int main()
      6 {
      7    vector<int> ivec;
      8    int ival;
      9    int sum=0;
     10    cout<<"input the elements of vector:"<<endl;
     11    while(cin>>ival)
     12      ivec.push_back(ival);
     13
     14    cout<<"the sum of the vector:";
     15    cout<<accumulate(ivec.begin(),ivec.end(),0)<<endl;
     16 }

1103.cc: In function `int main()':
1103.cc:15: `accumulate' undeclared (first use this function)
1103.cc:15: (Each undeclared identifier is reported only once for each function
it appears in.)

[jianfengshxy]

1 #include<iostream>
2 #include<algorithm>
3 #include<vector>
4 using namespace std;
5 int main()
6 {
7 vector<int> ivec;
8 int ival;
9 int sum=0;
10 cout<<"input the elements of vector:"<<endl;
11 while(cin>>ival)
12 ivec.push_back(ival);
13
14 cout<<"the sum of the vector:";
15 cout<<accumulate(ivec.begin(),ivec.end(),0)<<endl;
16 }
17
~

[我啃]

using namespace std;
或者用
std::

[我啃]

#include <numeric>
不再algorithm里面