C Programming Questions and Answers – Data Types and Sizes – 2

C Programming Questions and Answers – Data Types and Sizes – 2

Here is a listing of C language programming interview questions on “Data Types and Sizes” along with answers, explanations and/or solutions:

1. What will be the output of the following C code?

#include <stdio.h>
int main()
{
float f1 = 0.1;
if (f1 == 0.1)
printf(“equal\n”);
else
printf(“not equal\n”);
}

a) equal
b) not equal
c) output depends on the compiler
d) error

Answer: b
Explanation: 0.1 by default is of type double which has different representation than float resulting in inequality even after conversion.
Output:
$ cc pgm4.c
$ a.out
not equal

2. What will be the output of the following C code?

#include <stdio.h>
int main()
{
float f1 = 0.1;
if (f1 == 0.1f)
printf(“equal\n”);
else
printf(“not equal\n”);
}

a) equal
b) not equal
c) output depends on compiler
d) error

Answer: a
Explanation: 0.1f results in 0.1 to be stored in floating point representations.
Output:
$ cc pgm5.c
$ a.out
equal

3. What will be the output of the following C code on a 32-bit machine?

#include <stdio.h>
int main()
{
int x = 10000;
double y = 56;
int *p = &x;
double *q = &y;
printf(“p and q are %d and %d”, sizeof(p), sizeof(q));
return 0;
}

a) p and q are 4 and 4
b) p and q are 4 and 8
c) compiler error
d) p and q are 2 and 8

Answer: a
Explanation: Size of any type of pointer is 4 on a 32-bit machine.
Output:
$ cc pgm6.c
$ a.out
p and q are 4 and 4

4. Which is correct with respect to the size of the data types?
a) char > int > float
b) int > char > float
c) char < int < double
d) double > char > int

Answer: c
Explanation: char has less bytes than int and int has less bytes than double in any system

5. What will be the output of the following C code on a 64 bit machine?

#include <stdio.h>
union Sti
{
int nu;
char m;
};
int main()
{
union Sti s;
printf(“%d”, sizeof(s));
return 0;
}

a) 8
b) 5
c) 9
d) 4

Answer: d
Explanation: Since the size of a union is the size of its maximum data type, here int is the largest data type. Hence the size of the union is 4.
Output:
$ cc pgm7.c
$ a.out
4

6. What will be the output of the following C code?

#include <stdio.h>
int main()
{
float x = ‘a’;
printf(“%f”, x);
return 0;
}

a) a
b) run time error
c) a.0000000
d) 97.000000

Answer: d
Explanation: Since the ASCII value of a is 97, the same is assigned to the float variable and printed.
Output:
$ cc pgm8.c
$ a.out
97.000000

7. Which of the data types has the size that is variable?
a) int
b) struct
c) float
d) double

Answer: b
Explanation: Since the size of the structure depends on its fields, it has a variable size.

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