Not printing out correct values
Why is it not printing out the right values? I'm lost. Need help. Thanks.
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#include <iostream>
#include <cstdlib>
class cs234
{
public:
template <typename T>
class vector
{
public:
vector() {}
void push_back(T a)
{
if (size_m == 0)
{
capacity = 1;
}
size_m++;
if (capacity == size_m)
{
capacity = capacity * 2;
v = new T[capacity];
}
v[size_m] = a;
}
vector(const vector& b)
{
size_m = b.size_m;
capacity = b.capacity;
v = new T[capacity];
for (int i = 0; i < size_m; i++)
{
this->v[i] = b.v[i];
}
}
~vector()
{
if (v != NULL)
{
delete[] v;
v = NULL;
}
}
const T& operator [](int i) const
{
return v[i];
}
bool empty()
{
return (size_m == 0);
}
int pop_back()
{
return v[--size_m];
}
friend void Print(const vector<float >& rp)
{
for (int i{ 0 }; i < rp.size(); i++)
{
std::cout << rp[i] << " ";
}
}
size_t size() const
{
return size_m;
}
private:
T* v;
int capacity = 0;
size_t size_m = 0;
};
};
void TestPush(void)
{
std::cout << "\n********** TestPush **********\n";
cs234::vector<float> a;
std::cout << "Empty array:\n";
Print(a);
std::cout << "push_back 5 floats:\n";
for (float i = 0; i < 5; i++) {
a.push_back(i);
Print(a);
}
std::cout << "pop_back until empty:\n";
while (!a.empty()) {
a.pop_back();
Print(a);
}
}
int main(int argc, char **argv)
{
int test_num = 0;
if (argc > 1)
test_num = std::atoi(argv[1]);
typedef void (*Test) (void);
Test Tests[] = {
TestPush, // 1
};
int num = sizeof(Tests) / sizeof(*Tests);
if (test_num == 0) {
for (int i = 0; i < num; i++)
Tests[i] ();
} else if (test_num > 0 && test_num <= num)
Tests[test_num - 1] ();
}
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Last edited on
What are "the right values"?
What is it printing out, and how do they differ from what you expect?
We're not psychics!
In push_back you write the value to the wrong location in the array and you forgot to copy the elements to the new array when the capacity change.
Last edited on
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