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

Learning Objectives

General

What are the arithmetic operators and how to use them
What are the logical operators (sometimes called boolean operators) and how to use them
What the the relational operators and how to use them
What values are considered TRUE and FALSE in C
What are the boolean operators and how to use them
How to use the if, if ... else statements
How to use comments
How to declare variables of types char, int, unsigned int
How to assign values to variables
How to print the values of variables of type char, int, unsigned int with printf
How to use the while loop
How to use variables with the while loop
How to print variables using printf
What is the ASCII character set
What are the purpose of the gcc flags -m32 and -m64

Tasks

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.

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.

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

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

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

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

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

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

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

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

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

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

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