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CS 225 Data Structures
#ifndef SPHERE_H
#define SPHERE_H
namespace cs225 {
class Sphere {
public:
Sphere();
Sphere(double r);
double getRadius();
double getVolume();
private:
double r_;
};
}
#endif
sphere.h 1 2
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#include "sphere.h"
namespace cs225 {
Sphere::Sphere() {
}
Sphere::Sphere(double r) {
r_ = r;
// …lots of other logic…
}
double Sphere::getRadius() {
return r_;
}
double Sphere::getVolume() {
return (4 * r_ * r_ * r_ *
3.14159265) / 3.0;
}
}
sphere.cpp 1 2
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Stack Memory 0xffff00f0
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Location Value Type Name int main() {
int a;
int b = -3;
int c = 12345;
int *p = &b;
return 0;
}
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0xffff00f0
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example1.cpp
#include <iostream>
int main() {
std::cout << sizeof(int) << std::endl;
return 0;
}
sizeof-int.cpp 1 2
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#include <iostream>
int main() {
std::cout << sizeof(int *) << std::endl;
return 0;
}
sizeof-intptr.cpp 1 2
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Location Value Type Name int main() {
int a;
int b = -3;
int c = 12345;
int *p = &b;
return 0;
}
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&a: 0x7ffe2ee87218
&b: 0x7ffe2ee87214
&c: 0x7ffe2ee87210
&p: 0x7ffe2ee87208
Real results when running on linus.ews.illinois.edu
0x7ffe2ee87228
0x7ffe2ee87220
0x7ffe2ee87218
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0x7ffe2ee87208
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0x7ffe2ee871f8
0x7ffe2ee871f0
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0x7ffe2ee871e0
example1.cpp
Location Value Type Name #include "sphere.h"
int main() {
cs225::Sphere s;
cs225::Sphere *p = &s;
return 0;
}
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example2.cpp
#include <iostream>
#include "sphere.h"
int main() {
std::cout << sizeof(cs225::Sphere) << std::endl;
std::cout << sizeof(cs225::Sphere *) << std::endl;
return 0;
}
sizeof-sphere.cpp 1 2
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Stack Frames int hello() {
int a = 100;
return a;
}
int main() {
int a;
int b = -3;
int c = hello();
int d = 42;
return 0;
}
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stackframe.cpp
Return Values
Location Value Type Name #include "sphere.h"
using namespace cs225;
Sphere *CreateUnitSphere() {
Sphere s(1);
return &s;
}
int main() {
Sphere *s = CreateUnitSphere();
double r = s->getRadius();
double v = s->getVolume();
return 0;
}
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0xffff00f0
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sphere-badCreate.cpp
Location Value Type Name
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#include "sphere.h"
using namespace cs225;
Sphere *CreateUnitSphere() {
Sphere s(1);
return &s;
}
int main() {
Sphere *s = CreateUnitSphere();
double r = s->getRadius();
double v = s->getVolume();
return 0;
}
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sphere-badCreate.cpp
Location Value Type Name
0xffff00f0
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#include "sphere.h"
using namespace cs225;
Sphere *CreateUnitSphere() {
Sphere s(1);
return &s;
}
int main() {
Sphere *s = CreateUnitSphere();
double r = s->getRadius();
double v = s->getVolume();
return 0;
}
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sphere-badCreate.cpp
What happens on a real system?
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&s (CreateUnitSphere): 0x7ffee6bf5ca8
1
s->getRadius(): 2.07941e-317
&s (main): 0x7ffee6bf5d30
s (main): 0x7ffee6bf5ca8
&r (main): 0x7ffee6bf5d28
r (main): 6.95312e-310
&v (main): 0x7ffee6bf5d20
v (main): 0
Real results when running on linus.ews.illinois.edu
0x7ffee6bf5d38
0x7ffee6bf5d30
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int main() {
Sphere *s = CreateUnitSphere();
cout << s->getRadius() << endl;
cout << "s->getRadius(): “
<< s->getRadius() << endl;
cout << "&s (main): " << &s << endl;
cout << " s (main): " << s << endl;
double r = s->getRadius();
cout << "&r (main): " << &r << endl;
cout << " r (main): " << r << endl;
double v = s->getVolume();
cout << "&v (main): " << &v << endl;
cout << " v (main): " << v << endl;
}
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0x7ffee6bf5cb0
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(0x60 bytes not shown)
Stack Memory vs. Heap Memory
0x42000
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0x42048 0xffff00f0
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Heap Memory
0x42000
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0x42000
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#include "sphere.h"
using namespace cs225;
int main() {
int *p = new int;
int *s = new Sphere(10);
return 0;
}
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Location Value Type Name
0xffff00f0
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Location Value Type Name
heap1.cpp
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Location Value Type Name
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#include "sphere.h"
using namespace cs225;
int main() {
Sphere *s1 = new Sphere();
Sphere *s2 = s1;
s2->setRadius( 10 );
return 0;
}
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heap2.cpp
#include <iostream>
using namespace std;
int main() {
int *p;
int x;
p = &x;
x = 6;
cout << x << endl;
cout << p << endl;
return 0;
}
extra-puzzle1.cpp 1 2
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#include <iostream>
using namespace std;
int main() {
int *p, *q;
p = new int;
q = p;
*q = 8;
cout << *p << endl;
q = new int;
*q = 9;
cout << *p << endl;
cout << *q << endl;
return 0;
}
extra-puzzle2.cpp 1 2
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CS 225 – Things To Be Doing lab_intro Due Sunday by 11:59pm Make sure to turn in lab_intro by Sunday at 11:59pm
MP1 is out tonight! (after labs have finished) Due: Monday, Sept. 11th (weekend + week + weekend from now)
Office Hours are Starting Up… ~20 hours of office hours this weekend (Check “Calendar” on CS 225 website) - Having trouble with C++? - Having trouble with lab_intro? - Don’t understand something from lecture?
Have an awesome holiday weekend! …see you next Wednesday!
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