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0x01-variables_if_else_while

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0x01. C - Variables, if, else, while

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Author Details

Project Description

  • Allowed editors: vi, vim, emacs
  • All your files will be compiled on Ubuntu 20.04 LTS using gcc, using the options -Wall -Werror -Wextra -pedantic -std=gnu89
  • All your files should end with a new line
  • A README.md file, at the root of the folder of the project
  • There should be no errors and no warnings during compilation
  • You are not allowed to use system
  • Your code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl

Tasks

0

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0. Positive anything is better than negative nothing

  • This program will assign a random number to the variable n each time it is executed. Complete the source code in order to print whether the number stored in the variable n is positive or negative.
    • You can find the source code here
    • The variable n will store a different value every time you will run this program
    • You don’t have to understand what rand, srand, RAND_MAX do. Please do not touch this code
    • The output of the program should be:
      • The number, followed by
        • if the number is greater than 0: is positive
        • if the number is 0: is zero
        • if the number is less than 0: is negative
      • followed by a new line 
        julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 0-positive_or_negative.c -o 0-positive_or_negative
julien@ubuntu:~/0x01$ ./0-positive_or_negative 
-520693284 is negative



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 0-positive_or_negative.c

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1. The last digit

  • This program will assign a random number to the variable n each time it is executed. Complete the source code in order to print the last digit of the number stored in the variable n.
    • You can find the source code here
    • The variable n will store a different value every time you run this program
    • You don’t have to understand what rand, srand, and RAND_MAX do. Please do not touch this code
    • The output of the program should be:

      • The string Last digit of, followed by

      • n, followed by

      • the string is, followed by

        • if the last digit of n is greater than 5: the string and is greater than 5
        • if the last digit of n is 0: the string and is 0
        • if the last digit of n is less than 6 and not 0: the string and is less than 6 and not 0

      • followed by a new line

        julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 1-last_digit.c -o 1-last_digit
julien@ubuntu:~/0x01$ ./1-last_digit 
Last digit of 629438752 is 2 and is less than 6 and not 0



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 1-last_digit.c

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2. I sometimes suffer from insomnia. And when I can't fall asleep, I play what I call the alphabet game

  • Write a program that prints the alphabet in lowercase, followed by a new line.
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • All your code should be in the main function
    • You can only use putchar twice in your code



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 2-print_alphabet.c

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3. alphABET

  • Write a program that prints the alphabet in lowercase, and then in uppercase, followed by a new line.
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • All your code should be in the main function
    • You can only use putchar three times in your code



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 3-print_alphabets.c

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4. When I was having that alphabet soup, I never thought that it would pay off

  • Write a program that prints the alphabet in lowercase, followed by a new line.
    • Print all the letters except q and e
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • All your code should be in the main function
    • You can only use putchar twice in your code



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 4-print_alphabt.c

5

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5. Numbers

  • Write a program that prints all single digit numbers of base 10 starting from 0, followed by a new line.
    • All your code should be in the main function



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 5-print_numbers.c

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6. Numberz

  • Write a program that prints all single digit numbers of base 10 starting from 0, followed by a new line.
    • You are not allowed to use any variable of type char
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • You can only use putchar twice in your code
    • All your code should be in the main function



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 6-print_numberz.c

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7. Smile in the mirror

  • Write a program that prints the lowercase alphabet in reverse, followed by a new line.
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • All your code should be in the main function
    • You can only use putchar twice in your code
julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 7-print_tebahpla.c -o 7-print_tebahpla
julien@ubuntu:~/0x01$ ./7-print_tebahpla
zyxwvutsrqponmlkjihgfedcba



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 7-print_tebahpla.c

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8. Hexadecimal

  • Write a program that prints all the numbers of base 16 in lowercase, followed by a new line.
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • All your code should be in the main function
    • You can only use putchar three times in your code
julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 8-print_base16.c -o 8-print_base16
julien@ubuntu:~/0x01$ ./8-print_base16
0123456789abcdef



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 8-print_base16.c

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9. Patience, persistence and perspiration make an unbeatable combination for success

  • Write a program that prints all possible combinations of single-digit numbers.
    • Numbers must be separated by ,, followed by a space
    • Numbers should be printed in ascending order
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • All your code should be in the main function
    • You can only use putchar four times maximum in your code
    • You are not allowed to use any variable of type char
julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 9-print_comb.c -o 9-print_comb
julien@ubuntu:~/0x01$ ./9-print_comb | cat -e
0, 1, 2, 3, 4, 5, 6, 7, 8, 9$



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 9-print_comb.c

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10. Inventing is a combination of brains and materials. The more brains you use, the less material you need

  • Write a program that prints all possible different combinations of two digits.

    • Numbers must be separated by ,, followed by a space
    • The two digits must be different
    • 01 and 10 are considered the same combination of the two digits 0 and 1
    • Print only the smallest combination of two digits
    • Numbers should be printed in ascending order, with two digits
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • You can only use putchar five times maximum in your code
    • You are not allowed to use any variable of type char
    • All your code should be in the main function
    julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 100-print_comb3.c -o 100-print_comb3
julien@ubuntu:~/0x01$ ./100-print_comb3
01, 02, 03, 04, 05, 06, 07, 08, 09, 12, 13, 14, 15, 16, 17, 18, 19, 23, 24, 25, 26, 27, 28, 29, 34, 35, 36, 37, 38, 39, 45, 46, 47, 48, 49, 56, 57, 58, 59, 67, 68, 69, 78, 79, 89



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 100-print_comb3.c

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11. The success combination in business is: Do what you do better... and: do more of what you do...

  • Write a program that prints all possible different combinations of three digits.

    • Numbers must be separated by ,, followed by a space
    • The three digits must be different
    • 012, 120, 102, 021, 201, 210 are considered the same combination of the three digits 0, 1 and 2
    • Print only the smallest combination of three digits
    • Numbers should be printed in ascending order, with three digits
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • You can only use putchar six times maximum in your code
    • You are not allowed to use any variable of type char
    • All your code should be in the main function
    julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 101-print_comb4.c -o 101-print_comb4
julien@ubuntu:~/0x01$ ./101-print_comb4
012, 013, 014, 015, 016, 017, 018, 019, 023, 024, 025, 026, 027, 028, 029, 034, 035, 036, 037, 038, 039, 045, 046, 047, 048, 049, 056, 057, 058, 059, 067, 068, 069, 078, 079, 089, 123, 124, 125, 126, 127, 128, 129, 134, 135, 136, 137, 138, 139, 145, 146, 147, 148, 149, 156, 157, 158, 159, 167, 168, 169, 178, 179, 189, 234, 235, 236, 237, 238, 239, 245, 246, 247, 248, 249, 256, 257, 258, 259, 267, 268, 269, 278, 279, 289, 345, 346, 347, 348, 349, 356, 357, 358, 359, 367, 368, 369, 378, 379, 389, 456, 457, 458, 459, 467, 468, 469, 478, 479, 489, 567, 568, 569, 578, 579, 589, 678, 679, 689, 789



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 101-print_comb4.c

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12. Software is eating the World

  • Write a program that prints all possible combinations of two two-digit numbers.

    • The numbers should range from 0 to 99
    • The two numbers should be separated by a space
    • All numbers should be printed with two digits. 1 should be printed as 01
    • The combination of numbers must be separated by comma, followed by a space
    • The combinations of numbers should be printed in ascending order
    • 00 01 and 01 00 are considered as the same combination of the numbers 0 and 1
    • You can only use the putchar function (every other function (printf, puts, etc…) is forbidden)
    • You can only use putchar eight times maximum in your code
    • You are not allowed to use any variable of type char
    • All your code should be in the main function
    julien@ubuntu:~/0x01$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 102-print_comb5.c -o 102-print_comb5
julien@ubuntu:~/0x01$ ./102-print_comb5
00 01, 00 02, 00 03, 00 04, 00 05, 00 06, 00 07, 00 08, 00 09, 00 10, 00 11, [...] 40 91, 40 92, 40 93, 40 94, 40 95, 40 96, 40 97, 40 98, 40 99, 41 42, 41 43, 41 44, 41 45, 41 46, 41 47, 41 48, 41 49, 41 50, 41 51, 41 52, 41 53 [...] 93 95, 93 96, 93 97, 93 98, 93 99, 94 95, 94 96, 94 97, 94 98, 94 99, 95 96, 95 97, 95 98, 95 99, 96 97, 96 98, 96 99, 97 98, 97 99, 98 99



  • Repo
    • GitHub repository: alx-low_level_programming
    • Directory: 0x01-variables_if_else_while
    • File: 102-print_comb5.c



Dean Robin Otsyeno - [email protected]