31 lines
712 B
C
31 lines
712 B
C
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#include <stdio.h>
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#include <math.h>
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#define PI 3.1415927
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#define ZZS(x) ((x)>=0?1:-1)
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#define ABS(x) ((x)>=0?(x):(-(x)))
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double agl_ch(double x,double y);
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int main(void){
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int numbers;
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scanf("%d",&numbers);
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int i;
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double x1,y1,x2,y2;
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for(i = 0; i < numbers; i++){
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scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);
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double a1 = agl_ch(x1, y1), a2 = agl_ch(x2, y2);
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double a = ABS(a1 - a2);
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if(a > 180) a = 360 - a;
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printf("%.2lf\n",a);
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}
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return 0;
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}
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double agl_ch(double x,double y){
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double agl = atan(y/x) *(180/PI);
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if(ZZS(x) > 0 && ZZS(y) < 0) agl = 360 + -ABS(agl);
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else if(ZZS(x) < 0 && ZZS(y) > 0) agl = -ABS(agl) + 180;
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else if(ZZS(x) < 0 && ZZS(y) < 0) agl = ABS(agl) + 180;
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return agl;
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}
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