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CS 240Computer

Programming 1

Variables

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Question 1 :

Which of the following is a correct C++ identifier:

SS N1a$total

2D_D s-3 _ds

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Question 2 :

Which of the following is correctly formed constant of

type integer?

145 4.0 12.3 34 ‘8’ “9” 12,5

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Question 3 :

Declare the following using one statement:

int x;int y;int z;

 

char a = ‘i’;char b;char c = ‘E;’

 

int x , y , z;

char a = ‘i’ , b , c = ‘E; ’

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Question 4 :

Write a C++ statement to do the following :

a) Declare two variables of type character, each one is in a separate declaration statement .

char a;

char b;

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Question 4 :

Write a C++ statement to do the following :

b) Declare two variables of type character and initialize them with the values $and ? respectively in the declaration. NOTE: use one declaration statement .

char c = ‘$’ , d ; ’?‘ =

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Question 5:

Write the following algebraic expressions as C+

+ expressions :

𝑏2−4𝑎𝑐

b * 2 – 4 * a * c

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Question 5:

Write the following algebraic expressions as C+

+ expressions :

𝑤𝑙𝑥2− 22 𝑤𝑥w * l * x * 2 – w * x * 22

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Question 6: Each of the following

assignment statement contains at least one error. Identify

them : D e l t a = x ( y + ( 3 x +

( z + 1 5 ) ) )

X = 5 = y + 4

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Question 7:Given the algebraic equation y=a +7 , which of the following, if andy are correct C++ statements

for this equation?

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;

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Question 8:Correct the errors in the

following programs:

#i n c lude< ios t ream>;us ing namespace s td ;

in t ma in ( ) ;{ i n t x ; y=2;

z= 4 ; x=y+z ;

cout<<”x ; ”/ /pr in t the in teger x

}

#i n c lude< ios t ream>us ing namespace s td ;

in t ma in ( ){ i n t x , y=2 , z=4 ; x=y+z ;

cout<<x ;/ / pr in t the in teger

x}

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Question 8:Correct the errors in the

following programs:

#include<iostream>using name space std;

int main{

char a=”$”; cout<<a; cin>>b; cout<<b, return o;

#include<iostream>using name space std;

int main ( ){ char a=‘$’ , b; cout<<a; cin>>b; cout<<b; return 0;}

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Question 9:What is the output by each of the following code fragment?

int x=1;

int main(){

int x=3;cout<<x<<endl;cout<<::x<<endl;return 0;

}

The output :

3

1

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Question 9:What is the output by each of the following code fragment?

int a=1;

int b=-3;

int c=2;

b=a++;

c+=--a+b++;

cout<<a<<" "<<b<<" " <<c;

The output :

1 2 4

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Problem 1

Question

Write a program that asks the user to input 2 numbers A and B, then exchange the values of A and B.

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Problem 1Answer

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Problem 1Answer

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Problem 2Question

Write a program that reads in the length and the width of a

rectangular yard. Your program should compute the time required (in minutes) to cut

the grass at the rate of 2.3 square meters per a second.

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Problem 2Answer

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Problem 2Answer

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Problem 3Question

Write a program that asks the user to type the price without tax of one kilogram of tomatoes, the number of kilograms you want to buy and the tax in percent units. The program must calculate the

total price including taxes.

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Problem 3Answer

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Problem 3Answer