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using namespace std; 
 
int arraySum(int a[], int n)  
{ 
    int initial_sum  = 0;  
    return accumulate(a, a+n, initial_sum); 
} 
 
int main()  
{ 
    int a[] = {11 , 5 , 66} ; 
    int n = sizeof(a)/sizeof(a[0]); 
    cout << arraySum(a, n); 
    return 0; 
} 

prog.cpp: In function ‘int arraySum(int*, int)’:
prog.cpp:6:12: error: ‘accumulate’ was not declared in this scope
     return accumulate(a, a+n, initial_sum);
            ^~~~~~~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:13:5: error: ‘cout’ was not declared in this scope
     cout << arraySum(a, n);
     ^~~~
prog.cpp:13:5: note: ‘std::cout’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?
prog.cpp:1:1:
+#include <iostream>
 using namespace std;
prog.cpp:13:5:
     cout << arraySum(a, n);
     ^~~~

Standard output is empty