已知语句:while a>b do if c=5 then while x<y do x=x+1; else x=y; 要求:按照条件和赋值的翻译过程将上面的语句翻译成中间代码(用三地址码
时间: 2024-05-04 09:20:19 浏览: 28
我们可以将while循环和if语句分别拆开,先翻译内部的语句,再将它们组合起来生成完整的中间代码。翻译过程如下:
1. 翻译 while x<y do x=x+1;:
```
L1: if x < y goto L2;
goto L3;
L2: x = x + 1;
goto L1;
L3:
```
2. 翻译 if c=5 then while x<y do x=x+1; else x=y;:
```
if c = 5 goto L4;
x = y;
goto L5;
L4: L6: if x < y goto L7;
goto L5;
L7: x = x + 1;
goto L6;
L5:
```
3. 翻译 while a>b do if c=5 then while x<y do x=x+1; else x=y;:
```
L8: if a > b goto L9;
goto L10;
L9: if c = 5 goto L11;
x = y;
goto L12;
L11: L13: if x < y goto L14;
goto L12;
L14: x = x + 1;
goto L13;
L12: goto L8;
L10:
```
最终生成的中间代码如下:
```
L8: if a > b goto L9;
goto L10;
L9: if c = 5 goto L11;
x = y;
goto L12;
L11: L13: if x < y goto L14;
goto L12;
L14: x = x + 1;
goto L13;
L12: goto L8;
L10:
```