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#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int x=0;
int q=0;
int a[]={-5,-4,-3,-2,-1,0,1,2,3,4};
for ( int i = 0; i < 9; i++)
{
int x = a[i];
 q=(pow(x, 3)+3(pow(x, 2))+atan(x);
 cout << "B= " << q << endl;
}
int b = 2.8;
x=b;
 q=x^3+3(x^2)+atan(x); cout << "B= " << q << endl;
int c = 3.2;
x=c;
 q=x^3+3(x^2)+atan(x); cout << "B= " << q << endl;
}

prog.cpp: In function ‘int main()’:
prog.cpp:12:26: error: expression cannot be used as a function
  q=(pow(x, 3)+3(pow(x, 2))+atan(x);
                          ^
prog.cpp:12:35: error: expected ‘)’ before ‘;’ token
  q=(pow(x, 3)+3(pow(x, 2))+atan(x);
                                   ^
prog.cpp:17:13: error: expression cannot be used as a function
  q=x^3+3(x^2)+atan(x); cout << "B= " << q << endl;
             ^
prog.cpp:20:13: error: expression cannot be used as a function
  q=x^3+3(x^2)+atan(x); cout << "B= " << q << endl;
             ^

Standard output is empty