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Added files from first programming course at OSU
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Corwin Perren
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ECE 151 Section 10
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931759527
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1 - What does a comment in C look like? Give some examples.
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/** This is what the majority of block comments in C look like. Once it is
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* recognized as a comment, the block color will change for easier
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* readability.
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*/
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// This is an example of a single line comment. It's useful for commenting on
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// the same line as actual code.
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2 - How does one open a file in vi? Save a file? Quit?
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a. To open a file, you type "vi filename" at the linux command line.
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To save a file, enter vi command mode and type ":w"
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To quit, enter vi command mode and type ":q" or press shift-z-z
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3 - (3.1) Write the octal, decimal, and hexadecimal equivalents of these numbers.
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Answers in form "Original: octal, decimal, hexadecimal"
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a. 00110011 = 63, 51, 33
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b. 01101100 = 154, 108, 3C
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c. 01110111 = 167, 119, 77
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d. 00111101 = 75, 61, 3D
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e. 11111011 = -5, -5, -5
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f. 11111111 = -1, -1, -1
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g. 00100010001011010 = 42132, 17498, 445A
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h. 10100010001011010 = -135646, -48038, -BBA6
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4 - (3.5) Find the errors in each of the following segments.
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a. printf("%s\n", 'Happy Birthday');
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Fixed: printf("%s\n", "Happy Birthday");
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b. printf("\%c\n", 'Hello');
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Fixed: printf("%s\n", "Hello");
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c. printf("%c\n", "This is a string);
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Fixed: printf("%s\n", "This is a string");
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d. printf(""%s"", 'Good Bye');
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Fixed: printf("%s", "\"Good Bye\"\n");
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e. char c = 'a';
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printf("%s\n", c);
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Fixed: char c = 'a';
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printf("%c\n", c);
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f. printf('Enter your name: ");
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Fixed: printf("Enter your name: ");
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g. printf( %f, 123.456);
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Fixed: printf("%f", 123.456);
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h. printf("%s%s\n", 'O', 'K');
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Fixed: printf "%s%s\n, "O", "K");
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i. char c;
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scanf("%c", c);
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Fixed: char c;
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scanf("%c", &c);
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j. double d;
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scanf("%f", &d);
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printf("%f", d);
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Fixed: double d;
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scanf("%lf", &d);
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printf("%lf", d);
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k. int d;
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scanf("%f", &d);
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printf("%f", d);
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Fixed: int d;
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scanf("%d", &d);
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printf("%d", d);
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l. double x = 123.45678, y;
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int d;
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d = x;
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y = d;
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printf("%f\n", y);
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Fixed: double x = 123.45678
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double d;
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d = x;
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y = d;
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printf("%f\n", y);
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5 - (3.6) How many digits are after the decimal point for floating point values
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printed with printf? Does printf round or truncate values?
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a. There are six values after the decimal point by default. Yes,
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printf will always truncate to this number unless otherwise specified, and
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while doing so, it rounds the answer.
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6 - (3.17) Signed and unisgned representation problems
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a. Signed - 256
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Unsigned - 128
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b. Signed - 65536
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Unsigned - 32768
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c. Signed - 4294967296
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Unsigned - 2147483648
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d. Signed - 64
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Unsigned - 32
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e. Signed - 1024
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Unsigned - 512
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7 - (4.1) State whether the following are true or false?
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a. False. Operators in C are evaluated from right to left. The
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compiler reads down the code, the evaluates coming back up in the opposite
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direction.
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b. False. The || operator is an inclusive or, meaning that if either
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or both of the operator statements are true, the expression will evaluate as
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true.
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8 - (4.12) - Write C Expressions
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a. (x + 4) / (y + 5)
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b. 9 + (5*((x + 4) / (y + 5)))
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c. (4 / 3) * 3.14 * r pow(r, 3)
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d. x < y
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e. (x >= y) & (y <= z)
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f. (x >= y) & (x >= 0)
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g. (x <= 1) | (x > 20)
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h. (x > 1) & (x <= 20)
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i. ( (x > 1) & (x <= 20) ) | ( (y <= 3) & (y >= 1) )
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9 - (5.3) Correct errors in each of the code blocks
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a. if(age >= 65);
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printf("Age is greater than or equal to 65\n");
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else
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printf("Age is less than 65\n")
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a fixed: if(age >= 65){
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printf("Age is greater than or equal to 65\n");
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}else{
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printf("Age is less than 65\n");
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}
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b. if(i = 2)
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printf("i is 2\n");
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else
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printf("i is not equal to 2\n");
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b fixed: if(i == 2){
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printf("i is 2\n");
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}else{
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printf("i is not equal to 2\n");
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}
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c. for(x = 999; x >= 1; x +=2)
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printf("%d\n", n);
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c fixed: for(int x = 999; x >= 1; x -=2){
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printf("%d\n", x);
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}
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d. counter = 2;
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Do {
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if(counter % 2 == 0)
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printf("%d\n", counter);
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counter += 2;
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}While(counter < 100)
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d fixed: counter = 2;
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while(counter < 100){
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if((counter % 2) == 0){
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printf("%d\n", counter);
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counter += 2;
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}
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}
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e. total = 1;
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for(x = 100; x <= 150; x++);
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total += x;
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e fixed: total = 0;
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for(int x = 100; x <= 150; x++){
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total += x;
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}
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/** Pseudocode for question 6, homework 1, in ece151
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* Made by Corwin Perren
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*/
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create integer x
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create integer t
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create integer sum
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create integer a and set to 0
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create integer b and set to 1
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print "Enter the step of the Fibonacci sequence you want to calculate:"
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print a new line
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set integer t from user input
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while
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t is greater than x
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print a
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sum a and b
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set a = b
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set b = sum
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increment x by 1
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when false print new line
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/** Pseudocode for question 7, homework 1, in ece151
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* Made by Corwin Perren
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*/
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create integer x
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print "Enter a number between 0 and 255"
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print a new line
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receive an integer "x" from user
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if
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1: x is less than 0 and greater than 255
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and
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2: x is not -1
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print "The value you entered was improper or out or range"
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print a new line
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else if
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1: x is greater than or equal to 0
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and
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2: x is less than or equal to 255
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print corresponding ASCII character from value of x
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