sol1 - 1.124J Foundations of Software Engineering Problem...

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1.124J Foundations of Software Engineering Problem Set 1- Solution Due Date: Tuesday 9/19/00 Problem 1:[15%] Questions 1-3: Consider the following code: #include <iostream.h> extern int x; // Statement a int main() { int a, b; // Statement b double d = 9; // Statement c a = 1; // Statement d b = 5; // Statement e cout << x+ a/b + d/10 << endl; } 1. Which line of the above code is both a definition and an initialization? -> C 2. Which line of the above code declares a variable without allocating memory for it? -> a 3. Which lines of the above code are assignments? -> d & e 4. According to the following statement: const *int p; b. the value of the integer that p points to cannot change
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5. When the following logical test is true? ( x>=y && ! x && x* y < 0 && y==0) e. never 6. Which of the following cases of mixed expressions is/are correct (circle the correct one(s)), considering the following definition: double d; float f; int i; char c; c. ’f’ - ’d’ is an int 7. What is the result of the statement following the definitions given below? char c='b'; char *pc=&c; char *&rc=pc ; (*rc)++; c. it increases *rc 8. Considering the following definitions, which of the provided statements (if any) are invalid? double x= 0.5, y=4.9; double *px, *py, &rx=x; a. px =&x; double &rx = *px ; d. px = px = rx; e. px = py = *x; 9. Considering the following definitions, which of the provided statements (if any), would give the value of x , assuming that x is a double that has been properly defined and initialized to a value? void *pp = &x;
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double *px=&x; double **ppx=&px; a. **ppx b. *(static_cast <double*>(pp)) d. *(*(&px)) e. *( (double*)pp) 10. Which of the following expressions give(s) as result an int equal to 6? a. ’z’ - ’t’ b. 13 % 7 e. 55 % 7 11. What will be the value of x after the execution of the following line? int x = (7>6 ? 1+8 : 8) e. 9 12. Which of the following is a valid function declaration (i.e. prototype)? a. void func(int x);
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sol1 - 1.124J Foundations of Software Engineering Problem...

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