C Questions and Answers – Pragma

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Pragma”.

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

1. The preprocessor directive used to give additional information to the compiler, beyond which is conveyed in the language _____________
a) #include
b) #define
c) #pragma
d) #elif
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2. What will be the output of the following C code, if it is run on a 32 bit platform?

#include<stdio.h>
#pragma(1)
struct test
{
    int i;
    char j;
};
main()
{
    printf("%d",sizeof(struct test));
}

a) Error
b) 1
c) 4
d) 8
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3. In the directive, #pragma pack(n), which of the following is not a valid value of n?
a) 1
b) 2
c) 3
d) 4
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4. Which of the following attributes is used to specify that the minimum required memory to be used to represent the types?
a) packed
b) aligned
c) unused
d) deprecated
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5. In the directive #pragma pack(n), if the value of ‘n’ is given to be 5, then what happens?
a) Error
b) Warning but no error
c) Executes the pragma statement
d) Ignores the pragma statement and executes the program
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6. The correct syntax of the attribute packed is _________
a) __attribute__((packed));
b) _attribute(packed);
c) _attribute_((packed));
d) __attribute__(packed);
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7. The pragma ___________________ is used to remove an identifier completely from a program.
a) GNU piston
b) GCC poison
c) GNU poison
d) GCC piston
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8. 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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9. #pragma GCC poison should be followed by a list of identifiers that are _________
a) even in number
b) odd in number
c) valid
d) invalid
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10. What will be the output of the following C code?

#include<stdio.h>
#pragma GCC poison printf
main()
{
    printf("sanfoundry");
    return 0;
}

a) error is thrown
b) sanfoundry is printed
c) warning but no error
d) yrdnoufnas is printed
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