C Preprocessor - C Programming MCQ Questions and Answers Page-8 section-1

71.

What will be the output of the following C code?

#include<stdio.h>
#define max 100
main()
{
    #ifdef max
    printf("hello");
}

A. 100

B. hello

C. "hello"

D. error

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72.

What will be the output of the following C code?

#include<stdio.h>
#define hello 10
main()
{
    #ifdef hello
    #undef hello
    #define hello 100
    #else
    #define hello 200
    #endif
    printf("%d",hello);
}

A. Error

B. 10

C. 100

D. 200

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73.
Which of the following is not a preprocessor directive?

A. #error

B. #pragma

C. #if

D. #ifelse

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74.
The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define?

A. #ifdef

B. #undef

C. #ifndef

D. #def

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75.
The function of attribute((packed)); can also be performed using . . . . . . . .

A. #pragma pack(1);

B. #pragma pack(2);

C. #pragma pack(4);

D. #pragma pack(8);

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76.
The preprocessor directive which checks whether a constant expression results in a zero or non-zero value . . . . . . . .

A. #if

B. #ifdef

C. #undef

D. #ifndef

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77.

What will be the output of the following C code?

#include<stdio.h>
void f()
{
    #define sf 100
    printf("%d",sf);
}
int main()
{
    #define sf 99;
    f();
    printf("%d",sf);
}

A. error

B. 100

C. 99

D. 10099

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78.

What will be the output of the following C code?

#define HELLO(a) #a
main()
{
    printf(HELLO(good        morning)); 
}

A. good morning

B. HELLO good morning

C. good morning

D. error

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79.
The purpose of the preprocessor directive #error is that . . . . . . . .

A. It rectifies any error present in the code

B. It rectifies only the first error which occurs in the code

C. It causes the preprocessor to report a fatal error

D. It causes the preprocessor to ignore an error

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80.

What will be the output of the following C code?

#include<stdio.h>
#define ram 10
main()
{
    #ifdef ram
    #define ram 20
    #endif
    printf("%d",ram);
}

A. 10

B. 20

C. Error

D. 1020

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71.
What will be the output of the following C code?

`#include<stdio.h> #define max 100 main() { #ifdef max printf("hello"); }`

Answer & Solution

72.
What will be the output of the following C code?

`#include<stdio.h> #define hello 10 main() { #ifdef hello #undef hello #define hello 100 #else #define hello 200 #endif printf("%d",hello); }`

Answer & Solution

73.
Which of the following is not a preprocessor directive?

Answer & Solution

74.
The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define?

Answer & Solution

75.
The function of attribute((packed)); can also be performed using . . . . . . . .

Answer & Solution

76.
The preprocessor directive which checks whether a constant expression results in a zero or non-zero value . . . . . . . .

Answer & Solution

77.
What will be the output of the following C code?

`#include<stdio.h> void f() { #define sf 100 printf("%d",sf); } int main() { #define sf 99; f(); printf("%d",sf); }`

Answer & Solution

78.
What will be the output of the following C code?

`#define HELLO(a) #a main() { printf(HELLO(good morning)); }`

Answer & Solution

79.
The purpose of the preprocessor directive #error is that . . . . . . . .

Answer & Solution

80.
What will be the output of the following C code?

`#include<stdio.h> #define ram 10 main() { #ifdef ram #define ram 20 #endif printf("%d",ram); }`

Answer & Solution

C Preprocessor - C Programming MCQ Questions and Answers

71. What will be the output of the following C code? #include<stdio.h> #define max 100 main() { #ifdef max printf("hello"); }

Answer & Solution

72. What will be the output of the following C code? #include<stdio.h> #define hello 10 main() { #ifdef hello #undef hello #define hello 100 #else #define hello 200 #endif printf("%d",hello); }

Answer & Solution

73. Which of the following is not a preprocessor directive?

Answer & Solution

74. The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define?

Answer & Solution

75. The function of __attribute__((packed)); can also be performed using . . . . . . . .

Answer & Solution

76. The preprocessor directive which checks whether a constant expression results in a zero or non-zero value . . . . . . . .

Answer & Solution

77. What will be the output of the following C code? #include<stdio.h> void f() { #define sf 100 printf("%d",sf); } int main() { #define sf 99; f(); printf("%d",sf); }

Answer & Solution

78. What will be the output of the following C code? #define HELLO(a) #a main() { printf(HELLO(good morning)); }

Answer & Solution

79. The purpose of the preprocessor directive #error is that . . . . . . . .

Answer & Solution

80. What will be the output of the following C code? #include<stdio.h> #define ram 10 main() { #ifdef ram #define ram 20 #endif printf("%d",ram); }

Answer & Solution

71.
What will be the output of the following C code?

`#include<stdio.h> #define max 100 main() { #ifdef max printf("hello"); }`

72.
What will be the output of the following C code?

`#include<stdio.h> #define hello 10 main() { #ifdef hello #undef hello #define hello 100 #else #define hello 200 #endif printf("%d",hello); }`

73.
Which of the following is not a preprocessor directive?

74.
The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define?

75.
The function of attribute((packed)); can also be performed using . . . . . . . .

76.
The preprocessor directive which checks whether a constant expression results in a zero or non-zero value . . . . . . . .

77.
What will be the output of the following C code?

`#include<stdio.h> void f() { #define sf 100 printf("%d",sf); } int main() { #define sf 99; f(); printf("%d",sf); }`

78.
What will be the output of the following C code?

`#define HELLO(a) #a main() { printf(HELLO(good morning)); }`

79.
The purpose of the preprocessor directive #error is that . . . . . . . .

80.
What will be the output of the following C code?

`#include<stdio.h> #define ram 10 main() { #ifdef ram #define ram 20 #endif printf("%d",ram); }`