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Trắc nghiệm Ngôn Ngữ Lập Trình C++ - Bài 57

1-	What will be the output of the following program? #include<iostream.h> class IndiaBix { public: int x, y; IndiaBix(int xx = 10, int yy = 20) { x = xx; y = yy; } void Exchange(int , int ); }; int main() { IndiaBix objA(30, 40); IndiaBix objB(50); objA.Exchange(&objA.x, &objB.y); cout<< objA.x << " " << objB.y << endl; return 0; } void IndiaBix::Exchange(int x, int y) { int t; t = x; x = y; y = t ; }
	A -	20 10
	B -	30 20
	C -	20 30
	D -	30 40
2-	Which of the following statement is correct about the program given below? #include<iostream.h> class BixArray { int Matrix[3][3]; public: BixArray() { for(int i = 0; i<3; i++) for(int j = 0; j < 3; j++) Matrix[j][i] = i + j; } void Display(void) { for(int i = 0; i < 3; i++) for(int j = 0; j < 3; j++) cout<< Matrix[j][i] << " "; } }; int main() { BixArray objBix; objBix.Display(); return 0; }
	A -	The program will display the output 4 3 2 3 2 1 2 1 0.
	B -	The program will display the output 0 1 2 1 2 3 2 3 4.
	C -	The program will display the output 9 garbage values.
	D -	The program will report error on compilation.
3-	What will be the output of the following program? #include<iostream.h> class IndiaBix { int x, y, z; public: void Apply(int xx = 12, int yy = 21, int zz = 9) { x = xx; y = yy += 10; z = x -= 2; } void Display(void) { cout<< x << " " << y << endl; } void SetValue(int xx, int yy) { Apply(xx, 0, yy); } }; int main() { IndiaBix pBix= new IndiaBix; (pBix).SetValue(12, 20); pBix->Display(); delete pBix; return 0; }
	A -	10 10
	B -	12 10
	C -	12 21
	D -	The program will report compilation error.
4-	What will be the output of the following program? #include<iostream.h> #include<string.h> class IndiaBix { char txtMsg[50]; public: IndiaBix(char *str = NULL) { if(str != NULL) strcpy(txtMsg, str); } int BixFunction(char ch); }; int IndiaBix::BixFunction(char ch) { static int i = 0; if(txtMsg[i++] == ch) return strlen((txtMsg + i)) - i; else return BixFunction(ch); } int main() { IndiaBix objBix("Welcome to IndiaBix.com!"); cout<< objBix.BixFunction('t'); return 0; }
	A -	6
	B -	8
	C -	9
	D -	15
5-	Which of the following statement is correct about the program given below? #include<iostream.h> #include<string.h> #include<malloc.h> class BixString { char txtName[20]; public: BixString(char txtTemp = NULL) { if(txtTemp != NULL) strcpy(txtName, txtTemp); } void Display(void) { cout<<txtName; } }; int main() { char txtName = (char)malloc(10); strcpy(txtName, "IndiaBIX"); txtName = 48; BixString objTemp(txtName); cout<< sizeof(txtName); return 0; }
	A -	Above program will display IndiaBIX 8.
	B -	Above program will display IndiaBIX 9.
	C -	Above program will display size of integer.
	D -	Above program will display IndiaBIX and size of integer.
6-	Which of the following statement is correct about the program given below? #include<iostream.h> class IndiaBix { int x, y, z; public: IndiaBix(int x = 100, int y = 30, int z = 0) { this->x = x; this->y = y; this->z = z; Display(); } void Display() { cout<< x << " " << y << " " << z; } }; int main() { int a = 0, b = 1, c = 2; int &x = ++a; int &y = --b; int z = c + b - -c; IndiaBix objBix(x, y, z); return 0; }
	A -	The program will print the output 1 0 3.
	B -	The program will print the output 1 0 4.
	C -	The program will print the output 1 1 3.
	D -	The program will print the output 1 1 4.
7-	Which of the following statement is correct about the program given below? #include<iostream.h> class BixArray { int array[3][3]; public: BixArray(int arr[3][3] = NULL) { if(arr != NULL) for(int i = 0; i < 3; i++) for(int j = 0; j < 3; j++) array[i][j] = i+j; } void Display(void) { for(int i = 0; i < 3; i++) for(int j = 0; j < 3; j++) cout<< array[i][j] << " "; } }; int main() { BixArray objBA; objBA.Display(); return 0; }
	A -	The program will display NULL 9 times.
	B -	The program will report error on compilation.
	C -	The program will display 9 garbage values.
	D -	The program will display 0 1 2 1 2 3 2 3 4.
8-	What will be the output of the following program? #include<iostream.h> struct IndiaBix { int arr[5]; public: void BixFunction(void); void Display(void); }; void IndiaBix::Display(void) { for(int i = 0; i < 5; i++) cout<< arr[i] << " " ; } void IndiaBix::BixFunction(void) { static int i = 0, j = 4; int tmp = arr[i]; arr[i] = arr[j]; arr[j] = tmp ; i++; j--; if(j != i) BixFunction(); } int main() { IndiaBix objBix = {{ 5, 6, 3, 9, 0 }}; objBix.BixFunction(); objBix.Display(); return 0; }
	A -	0 9 3 6 5
	B -	9 3 6 5 0
	C -	5 6 3 9 0
	D -	5 9 3 6 0
9-	Which of the following statement is correct about the program given below? #include<iostream.h> class IndiaBix { int x; float y; public: IndiaBix(int x) { x = x; } IndiaBix(int p = 0, int q = 10) { x = p += 2; y = q * 1.0f; } void SetValue(int &y, float z) { x = y; y = (int)z; } void Display(void) { cout<< x; } }; int main() { int val = 12; IndiaBix objBix(val); IndiaBix objTmp(); objBix.SetValue(val, 3.14f); objBix.Display(); return 0; }
	A -	The program will print the output 2.
	B -	The program will print the output 12.
	C -	The program will report run time error.
	D -	The program will not compile successfully.
10-	What will be the output of the following program? #include<iostream.h> struct BixArray { int arr[5]; public: void BixFunction(); void Display(); }; void BixArray::BixFunction() { static int i = 0, j = 4; i++; j--; if(j > 0) BixFunction(); int tmp = arr[i]; arr[i] = arr[j]; arr[j] = tmp; i--; j++; } void BixArray::Display() { for(int i = 0; i < 5; i++) cout<< arr[i] << " "; } int main() { BixArray objArr = {{5, 6, 3, 9, 0}}; objArr.BixFunction(); objArr.Display(); return 0; }
	A -	0 9 3 6 5
	B -	0 5 6 3 9
	C -	0 6 3 9 5
	D -	None of these

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