1000 GOSUB 3100
...
1510 GOSUB 3100
...
2020 GOSUB 3110
...
3100 ～
3110 ～
～
3150 RETURN

↓　Ｃへ変換

L1000: // GOSUB 3100
	flag_stack_push(flag);
	flag = 1;
	goto L3100;
L1010:
～

L1510: // GOSUB 3100
	flag_stack_push(flag);
	flag = 2;
	goto L3100;
L1520:
～

L2020: // GOSUB 3110
	flag_stack_push(flag);
	flag = 3;
	goto L3110;
L2030:
～

L3100:
	～
L3110:
	～
～
L3150: // RETURN
	temp_flag = flag;
	flag = flag_stack_pop();
	switch (temp_flag) {
	case 1:
		goto L1010;
	case 2:
		goto L1520;
	caes 3:
		goto L2030;
	}
L3160: