C Questions and Answers – Implementation-Defined Limits – 1

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Implementation-Defined Limits – 1”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. The maximum value of a signed char is not the same as the maximum value of an unsigned char.
a) True
b) False
View Answer

Answer: a
Explanation: The maximum value of a signed char is 127 and that the maximum value of an unsigned char is 255. Thus it is clear that the maximum value of a signed char is not the same as the maximum value of an unsigned char.

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

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#include <stdio.h>
#include <limits.h>
int main() 
{
    printf("The minimum value of LONG = %lf\n", LONG_MIN);
    return 0;
}

a) -2147483648 (The minimum value of LONG)
b) 0.000000
c) 0
d) error
View Answer

Answer: b
Explanation: Since the format specifier %lf is used, 0.000000 is given as the output. If we want the output to be the minimum value of LONG, we should use the format specifier %ld is used.

3. The macro __________ defines the number of bits in a byte, which is equal to _______
a) CHAR_BIT, 4
b) CHAR_BYTE, 8
c) CHAR_BIT, 8
d) CHAR_BYTE, 4
View Answer

Answer: c
Explanation: The macro CHAR_BIT defines the number of bits in a byte, which is equal to 8.

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

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#include<stdio.h>
#include<limits.h>
main()
{
    printf("%f",FLT_MIN);
}

a) Minimum negative value of float
b) Maximum positive value of float
c) Error
d) Minimum positive value of float
View Answer

Answer: c
Explanation: The macro FLT_MIN is not defined under the header file limits.h. To use any macro relate to a floating point value or a double value, we should include the header file float.h. Since this header file is not included in the code shown above, it will result in an error.
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5. The macro MB_LEN_MAX is used to find _________
a) Maximum number of bytes in a multi-byte character
b) Whether the given function is valid or not
c) The maximum time taken for the execution of a particular function
d) Maximum number of bits in a multi-byte character
View Answer

Answer: a
Explanation: The macro MB_LEN_MAX is defined under the header file limits.h and is used to find the maximum number of bytes in a multi-byte character.

6. The value of CHAR_MAX will be equal to SCHAR_MAX when _________
a) char represents positive value
b) char represents value equal to 0
c) char represents negative value
d) char represents an exponential value
View Answer

Answer: c
Explanation: The macro CHAR_MAX defines the maximum value for type char and its value is equal to SCHAR_MAX is char represents negative value, otherwise UCHAR_MAX.

7. What will be the output of the following C code, given that the maximum value of signed char is 127 and that of unsigned char is 255.

#include<stdio.h>
#include<limits.h>
#define SCHAR_MAX
main()
{
    printf("%d",SCHAR_MAX+1);
}

a) 256
b) Error
c) 1
d) 128
View Answer

Answer: c
Explanation: The output of the code shown above will be equal to 1. This is because we have used the macro define to define a variable known as SCHAR_MAX (assigned a value of zero). Had this line not been a part of the above code, the output would be 128.

8. The macro which is used to find the maximum value of an unsigned integer is _________
a) UNINT_MAX
b) UNSINT_MAX
c) UINT_MAX
d) UNIT_MAX
View Answer

Answer: c
Explanation: The macro which is used to define the maximum value on an unsigned integer is: UINT_MAX. To find the maximum value on a signed integer, we use the macro: SINT_MAX.

9. To find the maximum value of an object of type unsigned long long int, we use the macro _________
a) ULINT_MAX
b) ULLINT_MAX
c) ULONG_MAX
d) ULLONG_MAX
View Answer

Answer: d
Explanation: The macro ULLONG_MAX is used to find the maximum value of unsigned long long int type. The macro ULONG_MAX is used to find the maximum value of unsigned long type.

10. Which of the following macros is defined under the header limits.h?
a) FLT_ROUNDS
b) USHRT_MAX
c) DBL_MAX
d) DECIMAL_DIG
View Answer

Answer: b
Explanation: the macros FLT_ROUNDS, DBL_MAX and DECIMAL_DIG are defined under the header float.h. The macro USHRT_MAX is defined under the header limits.h.

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