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Homework 4a and 4b - PowerPoint PPT Presentation

Homework 4a and 4b. Topics Go over Homework 4a Problems 2.7 - 2.15, Problems 3.11 - 3.13 Go over Homework 4a Problems 4.5 - 4.8. Homework 4a. 2.7 Identify and correct errors: scanf( “d”, value) ; Printf( “The product of %d and %d is %d”\n, x, y ) ;. Homework 4a.

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Topics

• Go over Homework 4aProblems 2.7 - 2.15, Problems 3.11 - 3.13

• Go over Homework 4aProblems 4.5 - 4.8

2.7 Identify and correct errors:

• scanf( “d”, value) ;

• Printf( “The product of %d and %d is %d”\n, x, y ) ;

2.7 Identify and correct errors:

c. firstNumber + secondNumber = sumOfNumbers

d. If ( number => largest ) largest == number ;

2.7 Identify and correct errors:

e. */ Program to determine the largest of three integers /*

f. Scanf(“%d”, anInteger);

2.7 Identify and correct errors:

g. printf( “Remainder of %d divided by %d is\n”, x, y, x % y);

h. If ( x = y );

printf( %d is equal to %d\n”, x, y );

2.7 Identify and correct errors:

i. print( “The sum is %d\n,” x + y );

j. Printf( “The value you enter is: %d\n, &value );

2.8 Fill in the blanks:

a) _________ are used to document a program and improve its readability.

b) The function used to print information on the screen is __________.

c) A C statement that makes a decision is ___.

d) Calculations are normally performed by _______________ statements.

e) The ____________ function inputs values from the keyboard.

2.9 Write a single C statement;

a) Print the message “Enter two numbers.”

b) Assign the product of variables b and c to variable a

2.9 Write a single C statement;

c) State that a program performs a sample payroll calculation (i.e., use text that helps to document a program).

d) Input three integer values from the keyboard and place these values in integer variables a, b, and c.

2.10 True or False.

a) C operators are evaluated from left to right.

b) The following are all valid variable names:

_under_bar_, m928134, t5, j7, her_sales, his_account_total, a, b, c, z, z2

2.10 True or False.

c) The statement printf(“a = 5;”); is a typical example of an assignment statement.

d) A valid C arithmetic expression containing no parentheses is evaluated from left to right.

2.10 True or False.

e) The following are all invalid variables names: 3g, 87, 67h2, h22, 2h

2.11 Fill in the blanks.

a) What arithmetic operations are on the same level of precedence as multiplication?

b) When parentheses are nested, which set of parentheses is evaluated first in an arithmetic expression?

2.11 Fill in the blanks.

c) A location in the computer’s memory that may contain different values at various times throughout the execution of a program is called a ___________.

2.12 Assume x = 2 and y = 3. Output?

a) printf( “%d”, x);

b) printf( “%d”, x + x);

c) printf( “x=“ );

d) printf( “x=%d”, x);

2.12 Assume x = 2 and y = 3. Output?

e) printf( “%d = %d”, x + y, y + x);

f) z = x + y ;

g) scanf( “%d%d”, &x, &y );

h) /* printf( “x + y = %d”, x + y); */

i) printf( “\n” );

a) scanf( “%d%d%d%d%d”, &b,&c,&d,&e,&f);

b) P = I + j + k + 7 ;

d) printf( “a = 5”);

2.14 Given y = ax3 + 7 ; Which are correct?

a) y = a * x * x * x + 7 ;

b) y = a * x * x * (x + 7) ;

c) y = (a * x) * x * (x + 7) ;

d) y = (a * x) * x * x + 7 ;

e) y = a * (x * x * x) + 7 ;

f) y = a * x * x * x + 7 ;

2.15 State the order of evaluation and find x.

a) x = y + 3 * 6 / 2 - 1;

2.15 State the order of evaluation and find x.

b) x = 2 % 2 + 2 * 2 - 2 / 2 ;

2.15 State the order of evaluation and find x.

c) x = ( 3 * 9 * ( 3 + ( 9 * 3 / ( 3 ) ) ) );

3.11 Identify and correct errors.

d) while ( y > 0 ) {

printf (“%d\n”, y );

++y;

}

3.12 Fill in blanks.

a) The solution to any problem involves performing a series of actions in a specific ___________.

b) A synonym for procedure is ___________.

c) A variable that accumulates the sum of several number is a __________.

d) The process of setting certain variables to specific values at the beginning of a program is called ________________.

3.12 Fill in blanks.

e) A special value used to indicate “end of data entry” is called a __________________, a __________________, a __________________, or a __________________ value.

3.12 Fill in blanks.

f) A _________________ is a graphical representation of an algorithm.

g) In a flowchart, the order in which the steps should be preformed is indicated by _____________________ symbols.

h) The termination symbol indicates the _____________ and ___________ of every algorithm.

3.12 Fill in blanks.

i) Rectangle symbols correspond to calculations that are normally performed by ________________ statements and input/output operations that are normally by calls to the ____________ and _________ standard library functions.

j) The item written inside a decision symbol is called a ________________.

3.13 Output of this program?

#include <stdio.h>

int main () {

int x = 1, total = 0, y;

while ( x <= 10 ) {

y = x * x;

printf(“%d\n”, y);

total += y;

++x;

}

printf(“Total is %d\n”, total);

return 0;

}

4.5 Identify and correct errors.

a) for ( x = 100, x >= 1, x++ )

printf( “%d\n”, x );

4.5 Identify and correct errors.

c) Input is “100 A” and print the input.

scanf( “%d”, &intVal );

charVal = getchar();

printf( “Integer: %d\nCharacter: %c\n”, intVal, charVal );

4.5 Identify and correct errors.

d) for ( x = .000001; x <= .0001; x += .000001) printf( “%.7f\n”, x);

4.5 Identify and correct errors.

e) Output the odd integers from 999 to 1.

for ( x = 999; x >= 1; x += 2) printf( “%.d\n”, x);

4.5 Identify and correct errors.

f) Output even integers from 2 to 100.

counter = 2;

Do {

if ( counter % 2 == 0)

printf( “%.d\n”, counter);

counter += 2;

} While (counter < 100) ;

4.5 Identify and correct errors.

g) Sum from 100 to 150.

for ( x = 100; x <= 150; x ++) ;

total += x;

4.6 Output?

a) for ( x = 2; x <= 13; x += 2)

printf( “%d\n”, x);

b) for ( x = 5; x <= 22; x += 7)

printf( “%d\n”, x);

c) for ( x = 3; x <= 15; x += 3)

printf( “%d\n”, x);

4.6 Output?

d) for ( x = 1; x <= 5; x += 7)

printf( “%d\n”, x);

e) for ( x = 12; x >= 2; x -= 3)

printf( “%d\n”, x);

4.7 Write for statements.

a) 1,2,3,4,5,6,7

b) 3,8,13,18,23

4.7 Write for statements.

c) 20,14,8,2,-4,-10

d) 19,27,35,43,51

4.8 Output?printf( "Enter two integers in the range 1-20:\n");

scanf("%d%d", &x, &y) ;

for ( i = 1; i <= y; i ++) {

for (j = 1; j <= x; j++ )

printf( "@");

printf( "\n");

}

• Read Sections 3.9 – 3.10

Next:

• Exam 2 on Wednesday, 11/06.

• Project 2 due Sudany, 11/10, midnight.