C Programming Questions and Answers – Type Conversions

C Programming Questions and Answers – Type Conversions

1.What is the output of this C code?

#include <stdio.h>

void main()

{

float x = 0.1;

if (x == 0.1)

printf(“studyhelpzone”);

else

printf(“Advanced C Classes”);

}

a) Advanced C Classes

b) studyhelpzone

c) Run time error

d) Compile time error

2.Comment on the output of this C code?

#include <stdio.h>

void main()

{

float x = 0.1;

printf(“%d, “, x);

printf(“%f”, x);

}

a) 0.100000, junk value

b) Junk value, 0.100000

c) 0, 0.100000

d) 0, 0.999999

3.What is the output of this C code?

(7 and 8 are entered)

#include <stdio.h>

void main()

{

float x;

int y;

printf(“enter two numbers \n”, x);

scanf(“%f %f”, &x, &y);

printf(“%f, %d”, x, y);

}

a) 7.000000, 7

b) Run time error

c) 7.000000, junk

d) Varies

4.What is the output of this C code?

#include <stdio.h>

void main()

{

double x = 123828749.66;

int y = x;

printf(“%d\n”, y);

printf(“%lf\n”, y);

}

a) 0, 0.0

b) 123828749, 123828749.66

c) 12382874, 12382874.0

d) 123828749, 0.000000

5.What is the output of this C code?

#include <stdio.h>

void main()

{

int x = 97;

char y = x;

printf(“%c\n”, y);

}

a) a

b) b

c) 97

d) Run time error

6.When double is converted to float, the value is?

a) Truncated

b) Rounded

c) Depends on the compiler

d) Depends on the standard

7.What is the output of this C code?

#include <stdio.h>

int main()

{

unsigned int i = 23;

signed char c = -23;

if (i > c)

printf(“Yes\n”);

else if (i < c)

printf(“No\n”);

}

a) Yes

b) No

c) Depends on the compiler

d) Depends on the operating system

8.What is the output of this C code?

#include <stdio.h>

int main()

{

int i = 23;

char c = -23;

if (i < c)

printf(“Yes\n”);

else

printf(“No\n”);

}

a) Yes

b) No

c) Depends on the compiler

d) Depends on the standard

9.function to lower(c) defined in library works for

a) Ascii character set

b) Unicode character set

c) Ascii and utf-8 but not EBSIDIC character set

d) Any character set

10.What is the output of the below code considering size of short int is 2, char is 1 and int is 4 bytes?

#include <stdio.h>

int main()

{

short int i = 20;

char c = 97;

printf(“%d, %d, %d\n”, sizeof(i), sizeof(c), sizeof(c + i));

return 0;

}

a) 2, 1, 2

b) 2, 1, 1

c) 2, 1, 4

d) 2, 2, 8

11.Which type conversion is NOT accepted?

a) From char to int

b) From float to char pointer

c) From negative int to char

d) From double to char

12.What will be the data type of the result of the following operation?

(float)a * (int)b / (long)c * (double)d

a) int

b) long

c) float

d) double

13.Which of the following type-casting have chances for wrap around?

a) From int to float

b) From int to char

c) From char to short

d) From char to int

14.Which of the following typecasting is accepted by C?

a) Widening conversions

b) Narrowing conversions

c) Both

d) None of the mentioned

15.When do you need to use type-conversions?

a) The value to be stored is beyond the max limit

b) The value to be stored is in a form not supported by that data type

c) To reduce the memory in use, relevant to the value

d) All of the mentioned