Table of Contents
这是第一个实验.我还没开始写呢,先在datalab-handout文件夹下一使用make构建,立即报错:
SHELL
1234567891011121314151617181920gcc -O1 -Wall -m32 -lm -o btest bits.c btest.c decl.c tests.c
In file included from btest.c:16:
/usr/include/stdio.h:27:10: fatal error: bits/libc-header-start.h: No such file or directory
27 | #include <bits/libc-header-start.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
In file included from decl.c:1:
/usr/include/stdio.h:27:10: fatal error: bits/libc-header-start.h: No such file or directory
27 | #include <bits/libc-header-start.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
In file included from /usr/lib/gcc/x86_64-linux-gnu/12/include/limits.h:203,
from /usr/lib/gcc/x86_64-linux-gnu/12/include/syslimits.h:7,
from /usr/lib/gcc/x86_64-linux-gnu/12/include/limits.h:34,
from tests.c:3:
/usr/include/limits.h:26:10: fatal error: bits/libc-header-start.h: No such file or directory
26 | #include <bits/libc-header-start.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:11: btest] Error 1
显然,这里缺少一个头文件.找到的解决办法是:
BASH
12sudo apt update
sudo apt-get install gcc-multilib
每次修改后,运行
BASH
1make && ./btest
会自动检查结果是否正确.至于其他文件夹,目前不了解是什么用处,可以查看README文件
我自己做了一下,真是疯狂!从没想过这些不用循环,控制语句的算法!也用上了一些逻辑学运算的知识才能勉强解决!
网上的答案中,这份写的不错: CSAPP | Lab1-Data Lab 深入解析 - 知乎
终于成功写完!非常有成就感!也让我意识到自己的不足.这个实验做了很久,可能有10小时.我感觉我的思维从来没有来到过这一层.看似简单的操作,需要考虑的情况非常繁杂.CMU不愧是名牌大学,教学质量真的狠,不是平庸之人能随意学会的.
第一个实验就如此丰富,下个实验更是大名鼎鼎的bomblab,非常期待!
最后欣赏一下全部pass的结果:
BASH
123456789101112131415161718192021222324kim@MyDell:/mnt/e/Documents/C/CSAPP/datalab-handout$ make && ./btest
gcc -O1 -Wall -m32 -lm -o btest bits.c btest.c decl.c tests.c
btest.c: In function ‘test_function’:
btest.c:334:23: warning: ‘arg_test_range’ may be used uninitialized [-Wmaybe-uninitialize ]
334 | if (arg_test_range[2] < 1)
| ~~~~~~~~~~~~~~^~~
btest.c:299:9: note: ‘arg_test_range’ declared here
299 | int arg_test_range[3]; /* test range for each argument */
| ^~~~~~~~~~~~~~
Score Rating Errors Function
1 1 0 bitXor
1 1 0 tmin
2 2 0 isTmax
2 2 0 allOddBits
2 2 0 negate
3 3 0 isAsciiDigit
3 3 0 conditional
3 3 0 isLessOrEqual
4 4 0 logicalNeg
4 4 0 howManyBits
4 4 0 float_twice
4 4 0 float_i2f
4 4 0 float_f2i
Total points: 37/37
Thanks for reading!