Question On Datatypes.docx

Question 1 Suppose a C program has floating constant 1.414, what's the best way to convert this as "float" data type? A

(float)1.414

B

float(1.414)

C

1.414f or 1.414F

D

1.414 itself of "float" data type i.e. nothing else required.

The correct answer is C. Question 2

What will be output when you will execute following c code? #include<stdio.h> int main(){ volatile int a=11; printf("%d",a); return 0; } Choose all that apply: 11 (B) Garbage (C) -2 (D) We cannot predict (E) Compilation error (A)

The correct answer is D. Question 3 “typedef” in C basically works as an alias. Which of the following is correct for “typedef”? A

typedef can be used to alias compound data types such as struct and union.

B

typedef can be used to alias both compound data types and pointer to these compound types.

C

typedef can be used to alias a function pointer.

D

typedef can be used to alias an array.

E

All of the above.

The correct answer is E.

Question4 In a C program snippet, followings are used for definition of Integer variables? signed s; unsigned u; long l; long long ll; Run on IDE Pick the best statement for these. A All of the above variable definitions are incorrect because basic data type int is missing. B All of the above variable definitions are correct because int is implicitly assumed in all of these. C Only “long l;” and “long long ll;” are valid definitions of variables. D Only “unsigned u;” is valid definition of variable. The correct answer is B.

Question5 Predict the output of following program. Assume that the numbers are stored in 2's complement form. #include<stdio.h> int main() { unsigned int x = -1; int y = ~0; if (x == y) printf("same"); else printf("not same"); return 0; }

A

Same

not same B The correct answer is A.

Question 6 Which of the following is not a valid declaration in C? 1. short int x; Run on IDE 2. signed short x; Run on IDE 3. short x; Run on IDE 4. unsigned short x; THE OPTIONS ARE: A

3 and 4

B

2

C

1

D

All are valid

The correct answer is D. Question 7 Predict the output #include <stdio.h>

int main() { float c = 5.0; printf ("Temperature in Fahrenheit is %.2f", (9/5)*c + 32); return 0; } THE OPTIONS ARE: A

Temperature in Fahrenheit is 41.00

B

Temperature in Fahrenheit is 37.00

C

Temperature in Fahrenheit is 0.00 Compiler Error

D The correct answer is B

Question 8 Predict the output of following C program #include <stdio.h> int main() { char a = '12';

printf("%d", a);

return 0; } Run on IDE A

Compiler Error

B

12

C

10

D

Empty

The correct answer is C. Question 9 In C, sizes of an integer and a pointer must be same. A

True

B

False

The correct answer is false Question 10 Output?

int main() { void *vptr, v; v = 0; vptr = &v; printf("%v", *vptr); getchar(); return 0; } Run on IDE A

0

B

Compiler Error

C

Garbage Value

The correct answer is B. Question 11 Assume that the size of char is 1 byte and negatives are stored in 2's complement form #include<stdio.h> int main() { char c = 125; c = c+10; printf("%d", c); return 0; } Run on IDE A

135

B

+INF

C

-121

D

-8

Tha correct answer is C.

Question 12 #include <stdio.h> int main() { if (sizeof(int) > -1) printf("Yes"); else printf("No"); return 0; } Run on IDE A

Yes

B

No

C

Compiler Error

D

Runtime Error

The correct answer is B. Question 13 Suppose n and p are unsigned int variables in a C program. We wish to set p to nC3. If n is large, which of the following statements is most likely to set p correctly? A

p = n * (n-1) * (n-2) / 6;

B

p = n * (n-1) / 2 * (n-2) / 3;

C

p = n * (n-1) / 3 * (n-2) / 2;

D

p = n * (n-1) * (n-2) / 6.0;

The correct answer is B. Question 14 Output of following program? #include<stdio.h> int main() {

float x = 0.1; if ( x == 0.1 ) printf("IF"); else if (x == 0.1f) printf("ELSE IF"); else printf("ELSE"); }

A

ELSE IF

B

IF ELSE

C The correct answer is A. 15. What is the size of an int data type? ● ● ● ●

A. 4 Bytes B. 8 Bytes C. Depends on the system/compiler D. Cannot be determined.

The correct answer is C. 16. Which data type is most suitable for storing a number 65000 in a 32-bit system? ● ● ● ●

A. short B. int C. long D. double

The correct answer is A. 17. Which of the following is a User-defined data type? ● ● ● ●

A. typedef int Boolean; B. typedef enum {Mon, Tue, Wed, Thu, Fri} Workdays; C. struct {char name[10], int age}; D. All of the mentioned

The correct answer is D. 18. 1. Comment on the output of this C code? int main() {

int a[5] = {1, 2, 3, 4, 5}; int i; for (i = 0; i < 5; i++) if ((char)a[i] == '5') printf("%d\n", a[i]); else printf("FAIL\n"); } ● ● ● ●

A. The compiler will flag an error B. Program will compile and print the output 5 C. Program will compile and print the ASCII value of 5 D. Program will compile and print FAIL for 5 times

Answer: Option D Explanation: The ASCII value of 5 is 53, the char type-casted integral value 5 is 5 only. Output: $ cc pgm1.c $ a.out FAILED FAILED FAILED FAILED FAILED

What will be output when you will execute following c code? 19.

#include<stdio.h> int main(){ int a= sizeof(signed) +sizeof(unsigned); int b=sizeof(const)+sizeof(volatile); printf("%d",a+++b); return 0; } Choose all that apply: 10 (B) 9 (C) 8 (D) Error: Cannot find size of modifiers (E) Error: Undefined operator +++ (A)

The correct answer is C.

What will be output when you will execute following c code?

#include<stdio.h> int main(){ signed x,a; unsigned y,b; a=(signed)10u; b=(unsigned)-10; y = (signed)10u + (unsigned)-10; x = y; printf("%d %u\t",a,b); if(x==y) printf("%d %d",x,y); else if(x!=y) printf("%u %u",x,y); return 0; } Choose all that apply: 10 -10 0 0 10 -10 65516 -10 (C) 10 -10 10 -10 (D) 10 65526 0 0 (E) Compilation error (A) (B)

The correct answer is D.