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#include <iostream>
using namespace std;
 
    class projmatrix{
    public:
        float nera = 0.1, fra = 1000, fov = 90, aratio = HEIGHT / (float)WIDTH;
        float fovtan = 1 / tanf((fov * 0.5 / 180) * 3.14159);
        float m[4][4] = {0};
        m[0][0] = aratio * fovtan;
        m[1][1] = fovtan;
        m[2][2] = fra/(fra-nera);
        m[3][2] = (-fra*nera)/(fra-nera);
        m[2][3] = 1;
};
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp:9:9: error: ‘m’ does not name a type; did you mean ‘tm’?
         m[0][0] = aratio * fovtan;
         ^
         tm
prog.cpp:10:9: error: ‘m’ does not name a type; did you mean ‘tm’?
         m[1][1] = fovtan;
         ^
         tm
prog.cpp:11:9: error: ‘m’ does not name a type; did you mean ‘tm’?
         m[2][2] = fra/(fra-nera);
         ^
         tm
prog.cpp:12:9: error: ‘m’ does not name a type; did you mean ‘tm’?
         m[3][2] = (-fra*nera)/(fra-nera);
         ^
         tm
prog.cpp:13:9: error: ‘m’ does not name a type; did you mean ‘tm’?
         m[2][3] = 1;
         ^
         tm
prog.cpp:6:58: error: ‘HEIGHT’ was not declared in this scope
         float nera = 0.1, fra = 1000, fov = 90, aratio = HEIGHT / (float)WIDTH;
                                                          ^~~~~~
prog.cpp:6:74: error: ‘WIDTH’ was not declared in this scope
         float nera = 0.1, fra = 1000, fov = 90, aratio = HEIGHT / (float)WIDTH;
                                                                          ^~~~~
prog.cpp:7:28: error: ‘tanf’ was not declared in this scope
         float fovtan = 1 / tanf((fov * 0.5 / 180) * 3.14159);
                            ^~~~
prog.cpp:7:28: note: suggested alternative: ‘rand’
         float fovtan = 1 / tanf((fov * 0.5 / 180) * 3.14159);
                            ^~~~
                            rand

Standard output is empty