0x01-variables_if_else_while

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

What you should learn from this project

At the end of this project you are expected to be able to explain to anyone, without the help of Google:

• 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 affect 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_or_negative.c

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

1-last_digit.c

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 n is greater than 5: the string and is greater than 5 if n is 0: the string and is 0 if n is less than 6 and not 0: the string and is less than 6 and not 0 followed by a new line

2-print_alphabet.c

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-print_alphabets.c

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-print_alphabt.c

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-print_numbers.c

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-print_numberz.c

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-print_tebahpla.c

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-print_base16.c

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-print_comb.c

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

100-print_comb2.c

Write a program that prints the numbers from 00 to 99.

• Numbers must be separated by ,, followed by a space
• 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

101-print_comb4.c

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)

102-print_comb5.c

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 coma, 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

Rev. 1:17, 18