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12/05/2021 09:20:44 AM

Câu hỏi trắc nghiệm ngôn ngữ lập trình C (tiếp theo)

153.

 What is the result of this function

    int foo(int j) {
        int x = 5 ;
        if( j == 0 ) {
            int x ;
            x = 3 ; }
        return x ;
    }

  1. 3
  2. 5
  3. 8
  4. 3 if j==0 and 0 otherwise

154.

 What value is returned from a call to subroutine f?

    int fred = 0;
    void g(int fred) {
        fred = 13 ;
    }
    int f() {
        int fred = 42 ;
        g( fred ) ;
        return fred ;
    }

  1. 0
  2. 13
  3. 42
  4. 5

155.

What value is returned from a call to subroutine f?

    int fred = 0;
    void g(int &frieda) { // This line is different from last time.
        frieda = 13 ;     // So is this one
    }
    int f() {
        int fred = 42 ;
        g( fred ) ;
        return fred ;
    }

  1. 0
  2. 13
  3. 42
  4. 5

156. What values are printed by this program?

#include
using namespace std ;

int nutsy(bool flag) {
    int fred ;
    if( flag ) fred = 42 ;
    return fred ; }

int main() {
    cout << nutsy( true ) << endl ;
    cout << nutsy( false ) << endl ; }

  1. 42 and 0
  2. 42 and 42
  3. 42 and who knows what
  4. 0 and 0

 

157.

What is printed by this program

#include
#include
using namespace std ;

int main() {
    int *p = new(nothrow) int ;
    if( p!=0 ) {
        *p = 99 ;
        int *q = p ;
        delete q ;
        cout << *p << endl ; }

}

  1. 99
  2. 0
  3. Unknown
  4. Unknown and the program may crash. 158.

Q 158. What is printed by this program

#include
#include
using namespace std ;

int main() {
    int *p = new(nothrow) int ;
    if( p!=0 ) {
        delete p ;
        *p = 99 ;
        cout << 12 << endl ; }
}

  1. 99
  2. 12
  3. Unknown and the program may crash
  4. The program will crash.

159.

What is printed by this program

#include
#include
using namespace std ;

int main() {
    int *p = new(nothrow) int ;
    if( p!=0 ) {
        *p = 99 ;
        int *q = p ;
        delete q ;
        cout << *p << endl ; }
}

  1. 99
  2. 0
  3. Unknown
  4. Unknown and the program may crash.

160.

What is printed by this program

#include
#include
using namespace std ;

int main() {
    int *p = new(nothrow) int ;
    if( p!=0 ) {
        delete p ;
        *p = 99 ;
        cout << 12 << endl ; }
}

  1. 99
  2. 12
  3. Unknown and the program may crash
  4. The program will crash.

 

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