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Constants Online Exam Quiz

Important questions about Constants. Constants MCQ questions with answers. Constants exam questions and answers for students and interviews.

1. Point out the error in the program. #include<stdio.h> #include<stdlib.h> union employee { char name[15]; int age; float salary; }; const union employee e1; int main() { strcpy(e1.name, "K"); printf("%s", e1.name); e1.age=85; printf("%d", e1.age); printf("%f", e1.salary); return 0; }

Options

A : Error: RValue required

B : Error: cannot modify const object

C : Error: LValue required in strcpy

D : No error

2. Point out the error in the program. #include<stdio.h> const char *fun(); int main() { char *ptr = fun(); return 0; } const char *fun() { return "Hello"; }

Options

A : Error: Lvalue required

B : Error: cannot convert ' const char * ' to ' char * '.

C : No error and No output

D : None of above

3. Point out the error in the program (in Turbo-C). #include<stdio.h> #define MAX 128 int main() { const int max=128; char array[max]; char string[MAX]; array[0] = string[0] = 'A'; printf("%c %c\n", array[0], string[0]); return 0; }

Options

A : Error: unknown max in declaration/Constant expression required

B : Error: invalid array string

C : None of above

D : No error. It prints A A

4. Point out the error in the program. #include<stdio.h> const char *fun(); int main() { *fun() = 'A'; return 0; } const char *fun() { return "Hello"; }

Options

A : Error: RValue required

B : Error: Lvalue required

C : Error: fun() returns a pointer const character which cannot be modified

D : No error

5. Point out the error in the program. #include<stdio.h> #define MAX 128 int main() { char mybuf[] = "India"; char yourbuf[] = "CURIOUSTAB"; char const *ptr = mybuf; *ptr = 'a'; ptr = yourbuf; return 0; }

Options

A : Error: cannot convert ptr const value

B : Error: unknown pointer conversion

C : No error

D : None of above

6. Point out the error in the program. #include<stdio.h> int main() { const int x; x=128; printf("%d\n", x); return 0; }

Options

A : Error: unknown data type const int

B : Error: const variable have been initialised when declared.

C : Error: stack overflow in x

D : No error

7. Point out the error in the program. #include<stdio.h> int main() { const int k=7; int *const q=&k; printf("%d", *q); return 0; }

Options

A : Error: RValue required

B : Error: Lvalue required

C : Error: cannot convert from ' const int * ' to ' int *const '

D : No error

8. Point out the error in the program. #include<stdio.h> #define MAX 128 int main() { char mybuf[] = "India"; char yourbuf[] = "CURIOUSTAB"; char *const ptr = mybuf; *ptr = 'a'; ptr = yourbuf; return 0; }

Options

A : Error: unknown pointer conversion

B : Error: cannot convert ptr const value

C : No error

D : None of above

1. What will be the output of the program? #include<stdio.h> int fun(int **ptr); int main() { int i=10; const int *ptr = &i; fun(&ptr); return 0; } int fun(int **ptr) { int j = 223; int *temp = &j; printf("Before changing ptr = %5x\n", *ptr); const *ptr = temp; printf("After changing ptr = %5x\n", *ptr); return 0; }

Options

A : Address of i Address of j

B : 10 223

C : Error: cannot convert parameter 1 from ' const int ** ' to ' int ** '

D : Garbage value

2. What will be the output of the program (in Turbo C)? #include<stdio.h> int fun(int *f) { *f = 10; return 0; } int main() { const int arr[5] = {1, 2, 3, 4, 5}; printf("Before modification arr[3] = %d", arr[3]); fun(&arr[3]); printf("\nAfter modification arr[3] = %d", arr[3]); return 0; }

Options

A : Before modification arr[3] = 4 After modification arr[3] = 10

B : Error: cannot convert parameter 1 from const int * to int *

C : Error: Invalid parameter

D : Before modification arr[3] = 4 After modification arr[3] = 4

3. What will be the output of the program? #include<stdio.h> int get(); int main() { const int x = get(); printf("%d", x); return 0; } int get() { return 20; }

Options

A : Garbage value

B : Error

C : 20

D : 0

4. What will be the output of the program? #include<stdio.h> int main() { int y=128; const int x=y; printf("%d\n", x); return 0; }

Options

A : 128

B : Garbage value

C : Error

D : 0

5. What will be the output of the program? #include<stdio.h> int main() { const int i=0; printf("%d\n", i++); return 0; }

Options

A : 10

B : 11

C : No output

D : Error: ++needs a value

6. What will be the output of the program in TurboC? #include<stdio.h> int fun(int **ptr); int main() { int i=10, j=20; const int *ptr = &i; printf(" i = %5X", ptr); printf(" ptr = %d", *ptr); ptr = &j; printf(" j = %5X", ptr); printf(" ptr = %d", *ptr); return 0; }

Options

A : i= FFE2 ptr=12 j=FFE4 ptr=24

B : i= FFE4 ptr=10 j=FFE2 ptr=20

C : i= FFE0 ptr=20 j=FFE1 ptr=30

D : Garbage value

7. What will be the output of the program? #include<stdio.h> int main() { const char *s = ""; char str[] = "Hello"; s = str; while(*s) printf("%c", *s++); return 0; }

Options

A : Error

B : H

C : Hello

D : Hel

8. What will be the output of the program? #include<stdio.h> #include<stdlib.h> union employee { char name[15]; int age; float salary; }; const union employee e1; int main() { strcpy(e1.name, "K"); printf("%s %d %f", e1.name, e1.age, e1.salary); return 0; }

Options

A : Error: RValue required

B : Error: cannot convert from ' const int * ' to ' int *const '

C : Error: LValue required in strcpy

D : No error

9. What will be the output of the program? #include<stdio.h> int main() { const int x=5; const int *ptrx; ptrx = &x; *ptrx = 10; printf("%d\n", x); return 0; }

Options

A : 5

B : 10

C : Error

D : Garbage value

10. What will be the output of the program? #include<stdio.h> int main() { const c = -11; const int d = 34; printf("%d, %d\n", c, d); return 0; }

Options

A : Error

B : -11, 34

C : 11, 34

D : None of these

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