D
Darius Fatakia
hi,
i'm new to MS Visual Studio and C++ but not to C programming in general. i'm
trying to divide two integers and get their actual quotient (eg 5/3 =
1.666667 etc). i thought i had type cast correctly, but please let me know,
because it appears to be rounding off. my code follows. Thanks!
void DrawLine(GLint x1, GLint y1, GLint x2, GLint y2)
{
int i, pk, dy, dx, yc, xc, inc, temp;
float m;
/*
x1 = 100;
y1 = 200;
x2 = 110;
y2 = 206;
*/
if((x1 >= x2) && (y1 >= y2)) {
temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
y1 = y2;
y2 = temp;
}
dy = y2 - y1;
dx = x2 - x1;
if (dx != 0) m = (float)(dy/dx);
else m = -999;
// Debugging info
printf("\nDrawLine called!\n");
printf("x1 = %d\n", x1);
printf("y1 = %d\n", y1);
printf("x2 = %d\n", x2);
printf("y2 = %d\n", y2);
printf("dx = %d\n", dx);
printf("dy = %d\n", dy);
if (dx != 0) printf("dy/dx = %d\n", dy/dx);
printf("m = %.2f\n", m);
}
DrawLine called!
x1 = 286
y1 = 204
x2 = 309
y2 = 187
dx = 23
dy = -17
dy/dx = 0
m = 0.00
i'm new to MS Visual Studio and C++ but not to C programming in general. i'm
trying to divide two integers and get their actual quotient (eg 5/3 =
1.666667 etc). i thought i had type cast correctly, but please let me know,
because it appears to be rounding off. my code follows. Thanks!
void DrawLine(GLint x1, GLint y1, GLint x2, GLint y2)
{
int i, pk, dy, dx, yc, xc, inc, temp;
float m;
/*
x1 = 100;
y1 = 200;
x2 = 110;
y2 = 206;
*/
if((x1 >= x2) && (y1 >= y2)) {
temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
y1 = y2;
y2 = temp;
}
dy = y2 - y1;
dx = x2 - x1;
if (dx != 0) m = (float)(dy/dx);
else m = -999;
// Debugging info
printf("\nDrawLine called!\n");
printf("x1 = %d\n", x1);
printf("y1 = %d\n", y1);
printf("x2 = %d\n", x2);
printf("y2 = %d\n", y2);
printf("dx = %d\n", dx);
printf("dy = %d\n", dy);
if (dx != 0) printf("dy/dx = %d\n", dy/dx);
printf("m = %.2f\n", m);
}
DrawLine called!
x1 = 286
y1 = 204
x2 = 309
y2 = 187
dx = 23
dy = -17
dy/dx = 0
m = 0.00