vu cs504 Mid Term Subjective Solved Past Paper No.2

vu cs504 Software Engineering - I Solved Past Papers

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Question 1: What steps we must follow to design good program?

Answer:

Hence to design a program properly, we must:

Analyze a problem statement, typically expressed as a word problem.

Express its essence, abstractly and with examples.

Formulate statements and comments in a precise language.

Evaluate and revise the activities in light of checks and tests and Pay attention to detail.

--or--

Details

We must check very details of any program. It is very important aspect of any program. We must pay complete attention to calculation.

We must give attention to logic and its flow should be smooth.

Reusable

We must write program in such a way that we can reuse them in other program. Like we define function in such a way that in future if we need any similar kind of function is requires in that case we can easily modify or reuse it.

Comments

We write the details of important steps in the form of comments. We should use comments in such a way if any body else wanted to reuse or debug or codes he can easily understand it.

Code readability

We should use Tab and spaces so codes are easily readable.

User interface

We make interface user friendly. Use polite prompts for user while take input.

Question 2: What will be the output of following code, if user input a number 123?
int input ;
cin >> oct >> input;
cout << hex << input ;

Answer:

Rational: it will take 123 as octal and print it in hex form which is 53.

Question 3: What will be the output of following code segment
int x[5] = {2, 4, 5, 7, 1} ;
int *ptr =&x[2];
cout << (*ptr)++ <<" " ;
cout << *ptr++ ;

Answer:

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Question 4: What will be the output of following code segment?
void func(int [], int);
main(){
int arr[5] = {2, 3, 5, 6, 7} ;
func(arr, 5) ;
for (int i = 0; i<5; i++)
cout << arr[i] << " ";
}
void func(int a[], int size){
for (int i = 0; i<size; i++)
a[i] = 2*a[i];
}

Answer:

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Question 5: What will be the output of following function if we call this function by passing int 5?
template T reciprocal(T x) {return (1/x); }

Answer:

The output will zero as 1/5 and its .05 but conversion to int make it zero. Above is prototype of template class so assume passing an int and returning an int

Question 6: What will be the output of following functions if we call these functions three times?
void func1(){
int x = 0;
x++;
cout << x << endl;
}
void func2(){
static int x = 0 ;
x++;
cout << x << endl ;
}

Answer:

First Function Output
1
1
1
Second Function Output
1

Question 7: What will be the output of the following code segment
int x= 6;
int y;
x = x << 1;
y = x >> 1;
cout << "x = " << x << " ";
cout << "y = " << y;

Answer:

x=12 and y=6

Question 8: When a pointer is incremented then how many bytes will it move to change its address

Answer:

If an integer occupies four bytes in the memory, then the yptr++; will increment its value by four. when we increment the yptr, it points to the next integer in the memory (page 160)

Question 9: When does an object get destroyed?

Answer:

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Question 10: Which arithmetic operators cannot have a floating point operand?

Answer: