this is C++, i need some help

// FILE: statexam.cxx // Written by Michael Main (main@colorado.edu) // Modified by Steve Kaminski to correct next_number member and to alter scoring scheme // This program calls five test functions to test the statisitician class. // Maximum number of points from executing this program is 20.

#include #include #include #include // Provides memcpy function #include "statistician.h" using namespace std; using namespace main_savitch_2C;

bool close(double a, double b) { const double EPSILON = 1e-5; return (fabs(a-b) < EPSILON); }

int test1( ) { // Test program for basic statistician functions. // Returns 20 if everything goes okay; otherwise returns 0.

statistician s, t; int i; double r = 0;

if (s.length( ) || t.length( )) return 0; if (s.sum( ) || t.sum( )) return 0;

for (i = 1; i <= 10000; i++) { s.next_number(i); r += i; };

if (t.length( ) || t.sum( )) return 0; if (s.length( ) != 10000) return 0; if (!close(s.sum( ), r)) return 0; if (!close(s.mean( ), r/10000)) return 0; // Reset and then retest everything s.reset( ); t.reset( ); r = 0; if (s.length( ) || t.length( )) return 0; if (s.sum( ) || t.sum( )) return 0;

for (i = 1; i <= 10000; i++) { s.next_number(i); r += i; };

if (t.length( ) || t.sum( )) return 0; if (s.length( ) != 10000) return 0; if (!close(s.sum( ), r)) return 0; if (!close(s.mean( ), r/10000)) return 0;

return 12; }

int test2( ) { // Test program for minimum/maximum statistician functions. // Returns 2 if everything goes okay; otherwise returns 0.

statistician s, t, u; double r = 1000; char n[15] = "10000000000000";

if (s.length( ) || t.length( )) return 0; if (s.sum( ) || t.sum( )) return 0;

memcpy(&r, n, sizeof(double)); r = 1/r; s.next_number(r); if ((s.minimum( ) != r) || (s.maximum( ) != r)) return 0; r *= -1; t.next_number(r); if ((t.minimum( ) != r) || (t.maximum( ) != r)) return 0;

u.next_number(100); u.next_number(-1); u.next_number(101); u.next_number(3); if ((u.minimum( ) != -1) || (u.maximum( ) != 101)) return 0;

return 2; }

int test3( ) { // Test program for + operator of the statistician // Returns 2 if everything goes okay; otherwise returns 0.

statistician s, t, u, v;

cout << " s.length(): " << s.length() << endl; cout << " t.length(): " << t.length() << endl;

if (s.length( ) || t.length( )) return 0; if (s.sum( ) || t.sum( )) return 0; cout << " s.length(): " << s.length() << endl; cout << " t.length(): " << t.length() << endl;

t.next_number(5); u.next_number(0); u.next_number(10); u.next_number(10); u.next_number(20);

v = s + s; if (v.length( ) || v.sum( )) return 0; v = s + u; if (!(u == v)) return 0; v = t + s; if (!(t == v)) return 0; v = t + u; if (v.length( ) != 5) return 0; if (!close(v.sum( ), 45)) return 0; if (v.minimum( ) != 0) return 0; if (v.maximum( ) != 20) return 0; if (!close(v.mean( ), 45.0/5)) return 0; v = v + t; if (v.length( ) != 6) return 0; if (!close(v.sum( ), 50)) return 0; if (v.minimum( ) != 0) return 0; if (v.maximum( ) != 20) return 0; if (!close(v.mean( ), 50.0/6)) return 0; return 2; }

int test4( ) { // Test program for * operator of the statistician // Returns 2 if everything goes okay; otherwise returns 0.

statistician s, t, u;

if (s.length( ) || t.length( )) return 0; if (s.sum( ) || t.sum( )) return 0;

u.next_number(0); u.next_number(10); u.next_number(10); u.next_number(20);

s = 2*u; if (s.length( ) != 4) return 0; if (!close(s.sum( ), 80)) return 0; if (s.minimum( ) != 0) return 0; if (s.maximum( ) != 40) return 0; if (!close(s.mean( ), 80.0/4)) return 0;

s = -2*u; if (s.length( ) != 4) return 0; if (!close(s.sum( ), -80)) return 0; if (s.minimum( ) != -40) return 0; if (s.maximum( ) != 0) return 0; if (!close(s.mean( ), -80.0/4)) return 0;

s = 0*u; if (s.length( ) != 4) return 0; if (!close(s.sum( ), 0)) return 0; if (s.minimum( ) != 0) return 0; if (s.maximum( ) != 0) return 0; if (!close(s.mean( ), 0)) return 0;

s = 10 * t; if (s.length( ) != 0) return 0; if (s.sum( ) != 0) return 0;

return 2; }

int test5( ) { // Test program for == operator of the statistician. // Returns 2 if everything goes okay; otherwise returns 0.

statistician s, t, u, v, w, x;

if (s.length( ) || t.length( )) return 0; if (s.sum( ) || t.sum( )) return 0;

t.next_number(10); u.next_number(0); u.next_number(10); u.next_number(10); u.next_number(20); v.next_number(5); v.next_number(0); v.next_number(20); v.next_number(15); w.next_number(0); x.next_number(0); x.next_number(0); if (!(s == s)) return 0; if (s == t) return 0; if (t == s) return 0; if (u == t) return 0; if (!(u == v)) return 0; if (w == x) return 0;

return 2; }

int main( ) { using namespace std; int value = 0; int result; cout << "Running statistician tests:" << endl; cout << "TEST 1:" << endl; cout << "Testing next, reset, length, sum, and mean (12 points). "; result = test1( ); value += result; if (result > 0) cout << "Test 1 passed." << endl << endl; else cout << "Test 1 failed." << endl << endl; cout << " TEST 2:" << endl; cout << "Testing minimum and maximum member functions (2 points). "; result = test2( ); value += result; if (result > 0) cout << "Test 2 passed." << endl << endl; else cout << "Test 2 failed." << endl << endl; cout << " TEST 3:" << endl; cout << "Testing the + operator (2 points). "; result = test3( ); value += result; if (result > 0) cout << "Test 3 passed." << endl << endl; else cout << "Test 3 failed." << endl << endl; cout << " TEST 4:" << endl; cout << "Testing the * operator (2 points). "; result = test4( ); value += result; if (result > 0) cout << "Test 4 passed." << endl << endl; else cout << "Test 4 failed." << endl << endl;

cout << " TEST 5:" << endl; cout << "Testing the == operator (2 points). "; result = test5( ); value += result; if (result > 0) cout << "Test 5 passed." << endl << endl; else cout << "Test 5 failed." << endl << endl;

cout << "Program scored " << value << " points out of 20 for execution. "; system("Pause"); return EXIT_SUCCESS;

}