im having a problem with a grades prorgram

[A15wardn]

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
float points, pospo, extra, percentage, response, pwec;
int yes, no;

cout << " please input your grade in points points possible format to find the percentage and letter grade ";
cin >> points >> pospo;

percentage = (points/ pospo) * 100.0;
pwec = ( points + extra ) / pospo * 100.0;

cout << " you got a " << percentage << "% ";

if (percentage > 89 && percentage < 101)
cout << " You got an A! ";

if (percentage > 79 && percentage < 90)
cout << " You got a B! ";

if (percentage > 69 && percentage < 80)
cout << " You got a C! ";

if (percentage < 70)
cout << " You got an F! ";

system("PAUSE");

// Output

cout << " Did you get any extra credit? ";
cin >> response;

if ( response = yes )
cout << " alright, how many points: ";

cin >> extra;

cout << " You got a " << pwec << "% ";

if (pwec < 101 && pwec > 89)
cout << " With extra credit you have an A! ";

if (pwec < 90 && pwec > 79)
cout << " With extra credit you have a B! ";

if (pwec < 80 && pwec > 69)
cout << " With extra credit you have a C! ";

if (pwec < 70)
cout << " You still have an F with extra credit ";



if (response = no)
cout << " Thank you for using this program! ";

system("PAUSE");
return EXIT_SUCCESS;
}
What is happening is hard to describe. After asking if extra credit was received , it doesn't let the user give any input and instead jumps right over the
cin >> extra;

(extra is the variable for extra credit). and goes strait to the the output, and treats extra as if it were 0, because it still gives an output percentage

[xwielder]

You must be in the same classroom as "tonic1713" who posted this: http://www.cplusplus.com/forum/general/81545/