LAB 1 Binary Numbers/ Introduction to C. Rajesh Rajamani. ME 4231 Department of Mechanical Engineering University Of Minnesota
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1 LAB 1 Binary Numbers/ Introduction to C Rajesh Rajamani ME 431 Department of Mechanical Engineering University Of Minnesota OVERVIEW What is feedback control? Binary and Hexadecimal Numbers Working with the C Language Tasks in Lab 1 1
2 FEEDBACK CONTROL Automatic control: Ensuring that one or more variables of interest are controlled to desired values Examples Cruise control Temperature control Elevator control The variables of interest are called outputs Control inputs are utilized for achieving automatic control Disturbance inputs might act on the system The power of feedback Explain Sensors and actuators BINARY TO DECIMAL CONVERSION Binary Decimal x 0 x x 1x x 0 x 1x 5 MSB LSB
3 BINARY NUMBERS Why are binary numbers needed in programming with data acquisition systems? The digital electronics in computers inherently store data as binary numbers Counters, analog-to-digital-converters, and other systems on a data acquisition card measure electrical signals and convert them to binary numbers Low cost embedded processors and microcontrollers do not have floating point units It is computationally efficient to deal entirely with data in binary format DECIMAL TO BINARY CONVERSION Convert decimal number 104 to binary 104 Integer Remainder 104/ 5 0 5/ 6 0 6/ / 6 1 6/ 3 0 3/ 1 1 1/ 0 1 Answer: x 6 1x 5 1x
4 HEXADECIMAL TO DECIMAL CONVERSION Hexadecimal numbers: Representation in terms of powers of Decimal A B C D E F Hexadecimal Hexadecimal Decimal 10 1 x F x 16 1x 16 B x 16 11x 16 1x 16 DECIMAL TO HEXADECIMAL CONVERSION Convert decimal number 104 to hexadecimal 104 Integer Remainder 104/ / Answer: x 16 8 x
5 HEXADECIMAL TO BINARY One hexadecimal digit gets replaced by 4 binary digits Decimal: 104 Hexadecimal: 68 6: : 1000 Binary: ADDITION OF BINARY NUMBERS Rules: = = = 10 i.e. 0 + carry = 11 i.e. 1 + carry 1 5
6 ADDITION: EXAMPLE Example = 33 14: : x 5 0 1x SUBTRACTION OF BINARY NUMBERS Rules: 0-0 = = = = borrow = 1 + borrow 6
7 SUBTRACTION: EXAMPLE Example 7-14 = 13 7: : x 3 1x 1x SIGNED NUMBERS A positive number has 0 as the most significant bit A negative number has 1 as the most significant bit + 15: :?? ????? NO
8 SIGNED NUMBERS Need to use the s complement to represent a negative number s complement First take 1 s complement +15: s complement: Then add Hence -15: SIGNED NUMBERS Check +15: : OK! 8
9 INTERPRETING SIGNED NUMBERS What is ? Answer: From the MSB, it is clear that it is a negative number Therefore, first subtract Then take 1 s complement Hence the number is -15! SIGNED NUMBERS: EXAMPLE Find in hexadecimal Step 1: First find in hexadecimal Integer Remainder 18435/ / / / Hence the hexadecimal equivalent of is
10 SIGNED NUMBERS: EXAMPLE Step : Convert to binary 4803 in binary is Step 3: Take 1 s complement SIGNED NUMBERS: EXAMPLE Step 4: Add Step 5: Convert back to hexadecimal B 7 F D Final answer: B7FD 10
11 INTRODUCTION TO C Example Program #include <stdio.h> void main() { float x, y; printf("\nenter number"); scanf("%f",&x); printf("\n%f\n",x); y = x*x; printf("\nhere is the square of the number:%f\n\n",y); } printf("enter the number whose square you wish to find (q to quit)\n"); while(scanf("%f",&x) == 1) { printf("\nx=%f",x); y = x*x; printf("\ny=%f",y); printf("\nenter the number whose square you wish to find (q to quit)\n"); } FOR LOOPS Syntax for (k=0; k<5; k++) { printf( %d\n,k); } While loop syntax Covered last week while(..) {. } 11
12 ARRAYS Example: Declaration of an array The line int count[10]; declares count to be an integer array of size 10. In C, all arrays start with slot 0 (rather than slot 1) Hence, the first element in the array count is called count[0] The last element in the array count is called count[9] ARRAYS An array can be declared with no initial values Then its initial values are unpredictable If an initializer is given, then array length may be omitted from the square brackets in the declaration statement Example: int count[] = {3,18,4,7,6,5,9,1,,3}; Note that the size of the array count is not explicitly declared. However, because of the initializer, count will be an array of size 10 1
13 ARRAYS The elements of an array can be accessed in ways Using subscripts Using pointers We will use subscripts in this lab. Pointers will be covered in the next lab. Example: Write a program to reverse order the elements of an array Note: Task in lab is to arrange the elements of an array in ascending order ORDER ARRAY ELEMENTS Determine i th element, i =0,1,,.,n =0 =1 i i Find smallest number among elements i, i +1, i+,.,n Place the smallest number in the i th element This can be done using for loops i =0,1,,3,..,n j =i+1,i+,i+3,..,n i j =i+1,i+,.,n Compare i th element with j th element and swap if j th element is smaller 13
14 TASKS IN LAB Tasks are described in detail in handout Task 1 Hello World example Task Check addition of hexadecimal numbers from pre-lab Task 3 Write a program to take in user input temperature and convert temperature in Fahrenheit to Celsius Task 4 Sorting elements in an array Task 5 Introduction to Matlab, plotting Important: Pre-labs, Post-labs 14
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