Dept. of Computer Engineering Final Exam, Second Semester: 2008/2009

Transcription

1 Philadelphia University Faculty of Engineering Student Name: Student Number: Dept. of Computer Engineering Final Exam, Second Semester: 2008/2009 Course Title: C++ Programming Date: 28/5/2009 Course No: (630203) Time Allowed: 2 Hours No. of Pages: 7 Lecturer: Dr. Ali Khawaldeh Eng. Salah Al-Din Badran Eng. Anis Nazer Question 1: True or False Answer the following questions with true or false (0.5 point each): The size of the array can be changed during program execution Any "for" loop can be written as a "while" loop The default case is optional in the switch statement. A variable must be declared before being used In C++, a function must return a value. (2.5 points) Question 2: Write C++ statement(s) to implement the following: (5 points) 1. declare a string and initialize it to your name 2. a loop that prints the odd numbers between 0 and increment the last element in an array of 10 integers A function prototype for a function that takes: - a one dimension array - and the address of a variable, and returns nothing. Print the address where a variable is stored in memory. 1

2 Question 3: Multiple choice Circle the correct answer in the following questions: (5 points) 1) A recursive function is a function that: a) has two different definitions b) calls itself c) is defined in <iostream.h> d) is defined before the function main( ) e) there is no such thing as a recursive function f) None of the above 2) Assuming the variable p is a pointer variable, the statement cout<< p[3]; is equivalent to: a) cout << *p; b) cout << *p + 3; c) cout << &(p + 3); d) cout << *(p+3) e) cout << (p + 3) f) None of the above 3) The function prototype of a function that takes a 9x10 array "B" is written as: a) void func(int B[ ][10] ); b) void func(int B[ 9][ ] ); c) void func(int B[10][9] ); d) void func(int B[ ][ ] ); e) void func(int B[8][9] ); f) None of the above 4) The condition if( (!(x==2)) && ( y > 2 ) ) is true when: a) x=2, y=-1 b) x=2, y=1 c) x=1, y=1 d) x=1, y=3 e) x=2, y=2 f) None of the above 5) The value of x after executing the code is: int x=4; x -= -2; a) 6 b) 2 c) 4 d) 0 e) -2 f) None of the above 2

3 Question 4: Write the output of the following programs: (11 points) The code The output The code The output a) g) int x=20, y=3, z; z= (x / y) * y; cout << z; char *s="this Exam is Easy"; cout << s[5]; b) void A(); int c = 13; A(); A(); c = c * 2; cout << c <<endl; void A() c = c + 2; c) int t=2; switch(t) case 0: case 1: t++; break; case 2: t--; break; case 3: t+=10; break; default: t *= 9; cout << t; h) double g(double a, double b); int main() cout<<g(500,400)<<endl; double g(double a, double b) return (b / a)*100; i) double F[5]=5,-3,-9,1,-4; int i; for (i=1; i < 4 ; i ++ ) F[i] = F[i] * i; for (i=0; i < 5 ; i ++ ) cout << F[i] << endl; d) // assume that the address // of p is 023fc3 double p=5; double *q = &p; *q = 22; cout << "p=" << p <<endl; e) int x=3,c=3; do x = c * 2; c++; while( c < 7); cout << c << endl << x; j) void KKK(float R[], int y); float F[7]=2, -7, 0, 5, -3, 9, -4; KKK(F,4); cout << F[4]; void KKK(float R[], int y) R[y] += 5; k) float F[7]=2, -7, 0, 5, -3, 9,-4; float *mu2asher; mu2asher = &F[0]; cout << *(mu2asher + 2); f) int qesmi(int x, int y); cout << qesmi(8,3); int qesmi(int x, int y) if ( x < y) else return 1 + qesmi(x-y,y); 3

4 Question 5: Rewrite each of the following code in other way, as required, to get the same results: (7.5 points) 1) The Given Code int i=0; while(i<3) i++; cout<<"loop Me"<<endl; The corresponding required Code: Using one for loop only: 2) Using SWITCH statement only: if (course = = 1) cout<<"term1"; else if (course = = 2) cout<<"term2"; else if (course = = 3) cout<<"summer"; else cout<<"error"; 3) if( i < 20) if(x = = 5) if( y!= 0) cout<<"help"; Using one if statement only: 4) for(int i=0 ; i < (1- i) ; i++) cout<<n[i] ; Using one statement only: 5) Using do/while only: while(a<5) cout<<++a; 4

5 Question 6: Write a complete C++ program to calculate the following sum: n 1 3 z = f ( t + i t ). i= 1 2 t, and n to be entered by the user. Let f ( t) 2t ln( t ) function call to calculate f ( t ) (7 points) =, use a loop to calculate the sum, and a 5

6 Question 7: (5 points) Write a complete program that allows the user to enter his/her real numbers in a 3x3 two dimensional array. Find the average and minimum, of the diagonal elements. 6

7 Question 8: (7 points) Write a complete program that let the user search a required key value in the following matrix, the key value is entered by the user. Z=3.5, 1.5, -9, 8, 2, 34, 0, 0, -1, 4, 5.4, 2.1, 4.2 7