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int dif[4]=0;
dif[0] = RectB.x + RectB.w - RectA.x; // AがBの右側から食い込んでいる長さ
dif[1] = RectA.x + RectA.w - RectB.x; // 左側
dif[2] = RectB.y + RectB.h - RectA.y; // 上側
dif[3] = RectA.y + RectA.h - RectB.y; // 下側
 
int dif_rl  = (dif[0] < dif[1]) ? 0 : 1;
int dif_ur  = (dif[2] < dif[3]) ? 2 : 3;
int dif_dir = (dif_rl < dif_ur) ? dif_rl : dif_ur;
 
switch(dif_dir)
{
	case 0: // 右側で衝突
		break;
	case 1: //　左側
		break;
	case 2: //　上側
		break;
	case 3: //　下側
		break;
	default:
		break;
}
 

prog.c:1:1: error: invalid initializer
 int dif[4]=0;
 ^
prog.c:2:1: warning: data definition has no type or storage class [enabled by default]
 dif[0] = RectB.x + RectB.w - RectA.x; // AがBの右側から食い込んでいる長さ
 ^
prog.c:2:1: warning: type defaults to ‘int’ in declaration of ‘dif’ [-Wimplicit-int]
prog.c:2:1: error: conflicting types for ‘dif’
prog.c:1:5: note: previous definition of ‘dif’ was here
 int dif[4]=0;
     ^
prog.c:2:10: error: ‘RectB’ undeclared here (not in a function)
 dif[0] = RectB.x + RectB.w - RectA.x; // AがBの右側から食い込んでいる長さ
          ^
prog.c:2:30: error: ‘RectA’ undeclared here (not in a function)
 dif[0] = RectB.x + RectB.w - RectA.x; // AがBの右側から食い込んでいる長さ
                              ^
prog.c:3:1: warning: data definition has no type or storage class [enabled by default]
 dif[1] = RectA.x + RectA.w - RectB.x; // 左側
 ^
prog.c:3:1: warning: type defaults to ‘int’ in declaration of ‘dif’ [-Wimplicit-int]
prog.c:3:1: error: conflicting types for ‘dif’
prog.c:1:5: note: previous definition of ‘dif’ was here
 int dif[4]=0;
     ^
prog.c:4:1: warning: data definition has no type or storage class [enabled by default]
 dif[2] = RectB.y + RectB.h - RectA.y; // 上側
 ^
prog.c:4:1: warning: type defaults to ‘int’ in declaration of ‘dif’ [-Wimplicit-int]
prog.c:4:1: error: conflicting types for ‘dif’
prog.c:1:5: note: previous definition of ‘dif’ was here
 int dif[4]=0;
     ^
prog.c:5:1: warning: data definition has no type or storage class [enabled by default]
 dif[3] = RectA.y + RectA.h - RectB.y; // 下側
 ^
prog.c:5:1: warning: type defaults to ‘int’ in declaration of ‘dif’ [-Wimplicit-int]
prog.c:5:1: error: conflicting types for ‘dif’
prog.c:1:5: note: previous definition of ‘dif’ was here
 int dif[4]=0;
     ^
prog.c:7:1: error: initializer element is not constant
 int dif_rl  = (dif[0] < dif[1]) ? 0 : 1;
 ^
prog.c:8:1: error: initializer element is not constant
 int dif_ur  = (dif[2] < dif[3]) ? 2 : 3;
 ^
prog.c:9:1: error: initializer element is not constant
 int dif_dir = (dif_rl < dif_ur) ? dif_rl : dif_ur;
 ^
prog.c:11:1: error: expected identifier or ‘(’ before ‘switch’
 switch(dif_dir)
 ^

Standard output is empty