- Nested while loops
- C - Functions
- What is the purpose of a function prototype?
- C - Header Files
- C - Books and PDF's to check out and use as reference.
- A Makefile is provided to compile all the tests.
- Usage:
make [test_name] - Example:
make 1will compile and run the test for task 1. - Example:
make check-allwill compile and run all tests. - Example:
make cleanwill remove all executable files. - Some test's output will not be displayed in the terminal only
SUCCESSorFAILURE. - To print the full output of the particular test, run the executable file directly using
./[test_name]. - All tests are in the tests directory.
- All tests are compiled with
gcc -Wall -Werror -Wextra -pedantic -std=gnu89 -g3 -o <name_of_test> <name_of_test>.c <name_of_file>.c - All tests are run with
./<name_of_test>
- Note for all these challenges we will not be using global variables and any standard library.
- We will be using function prototypes that will be included in our header file called, main.h.
- We are allowed to use the prototype funtion _putchar.
- All
*-main.cfiles will be located in the main directory
0. _putchar
- Below is the assembly code of the program with comments.
<main>: endbr64
<main+4>: push rbp ; \ standard function
<main+5>: mov rbp,rsp ; / prologue code
<main+8>: sub rsp,0x20 ; allocate space for stack array
<main+12>: mov rax,QWORD PTR fs:0x28 ; stack-guard moved to rax
<main+21>: mov QWORD PTR [rbp-0x8],rax ; stack-guard moved to rbp-0x8
<main+25>: xor eax,eax ; zeroing out eax
<main+27>: movabs rax,0x726168637475705f ; string '_putchar' moved to rax
<main+37>: mov QWORD PTR [rbp-0x11],rax ; string moved to rbp-0x11
<main+41>: mov BYTE PTR [rbp-0x9],0x0 ; rbp-0x9 = 0
<main+45>: mov DWORD PTR [rbp-0x18],0x0 ; rbp-0x18 (ch) = 0
<main+52>: jmp 0x5555555551e0 <main+78> ; jump
<main+54>: mov eax,DWORD PTR [rbp-0x18] ; move rbp-0x18 (ch) to eax
<main+57>: cdqe ; rax = eax (ch)
<main+59>: movzx eax,BYTE PTR [rbp+rax*1-0x11] ; eax = rbp-0x11[ch]
<main+64>: movsx eax,al ; mov 8-bit str chr value to eax
<main+67>: mov edi,eax ; mov str chr to edi (arg1)
<main+69>: call 0x555555555169 <_putchar> ; print character
<main+74>: add DWORD PTR [rbp-0x18],0x1 ; increament rbp-0x18 by 1
<main+78>: cmp DWORD PTR [rbp-0x18],0x8 ; is ch <= 8
<main+82>: jle 0x5555555551c8 <main+54> ; jump
<main+84>: mov edi,0xa ; mov char '\n' to edi (arg1)
<main+89>: call 0x555555555169 <_putchar> ; print new line char
<main+94>: mov eax,0x0 ; eax = 0
<main+99>: mov rdx,QWORD PTR [rbp-0x8] ; mv stack-guard to rdx
<main+103>: sub rdx,QWORD PTR fs:0x28 ; rdx should be 0
<main+112>: je 0x555555555209 <main+119> ; leave function when equal
<main+114>: call 0x555555555070 <__stack_chk_fail@plt>
<main+119>: leave
<main+120>: ret- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c 0-putchar.c -o 0-putchar
1. I sometimes suffer from insomnia. And when I can't fall asleep, I play what I call the alphabet game
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/1-main.c 1-alphabet.c -o 1-alphabet
2. 10 x alphabet
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/2-main.c 2-print_alphabet_x10.c -o 2-alphabet_x10
3. islower
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/3-main.c 3-islower.c -o 3-islower
4. isalpha
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/4-main.c 4-isalpha.c -o 4-isalpha
5. Sign
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/5-main.c 5-sign.c -o 5-sign
6. There is no such thing as absolute value in this world. You can only estimate what a thing is worth to you
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/6-main.c 6-abs.c -o 6-abs
7. There are only 3 colors, 10 digits, and 7 notes; it's what we do with them that's important
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/7-main.c 7-print_last_digit.c -o 7-last_digit
8. I'm federal agent Jack Bauer, and today is the longest day of my life
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/8-main.c 8-24_hours.c -o 8-24
9. Learn your times table
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/9-main.c 9-times_table.c -o 9-times_table
10. a+b
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/10-main.c 10-add.c -o 10-add
11. 98 Battery Street, the OG
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/11-main.c 11-print_to_98.c -o 11-98
12. The World looks like a multiplication-table, or a mathematical equation, which, turn it how you will, balances itself
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 _putchar.c main/100-main.c 100-times_table.c -o 100-times_table
13. Nature made the natural numbers; All else is the work of women
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 101-natural.c -o 101-natural
14. In computer class, the first assignment was to write a program to print the first 100 Fibonacci numbers. Instead, I wrote a program that would steal passwords of students. My teacher gave me an A
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 102-fibonacci.c -o 102-fibonacci
15. Even Liber Abbaci
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 103-fibonacci.c -o 103-fibonacci
16. In computer class, the first assignment was to write a program to print the first 100 Fibonacci numbers. Instead, I wrote a program that would steal passwords of students. My teacher gave me an A+
- Compile this way:
gcc -Wall -pedantic -Werror -Wextra -std=gnu89 104-fibonacci.c -o 104-fibonacci