C Questions and Answers – Diagnostics – 2

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Diagnostics – 2”.

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

1. The following message is displayed in stderr.
Assertion failed: expression, file filenum, line nmn
a) true
b) false
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2. The source filename and line number come from the preprocessor macros ________ and ______
a) _ _FILE_ _ and _ _LINE_ _
b) _ _NAME_ _ and _ _NUMBER_ _
c) _ _FILENAME_ _ and _ _NMN_ _
d) _ _FILE_ _ and _ _NUM_ _
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3. The function abort() is defined in which of the following header file?
a) stdio.h
b) stdarg.h
c) stdlib.h
d) assert.h
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4. Correct code to turn assertions ON at various places throughout a source file is _________
a)

#undef NDEBUG 
#include <assert.h>

b)

#define NDEBUG 
#include <assert.h>

c)

#define NDEBUG 
#include <stdlib.h>

d)

#undef NDEBUG 
#include <stdlib.h>

#undef NDEBUG 
#include <assert.h>

5. Correct code to turn assertions OFF at various places throughout a source file is _________
a)

#undef NDEBUG 
#include <assert.h>

b)

#define NDEBUG 
#include <assert.h>

c)

#define NDEBUG 
#include <stdlib.h>

d)

#undef NDEBUG 
#include <stdlib.h>

#define NDEBUG 
#include <assert.h>

6. Which line from the given code is the passive form?

#undef assert 
#ifdef NDEBUG 
#define assert (test) ( (void) 0) 
#else 
#define assert (test)  
#endif

a) #define assert(test)
b) #define assert(test) ((void)0)
c) #ifdef NDEBUG
d) #undef assert
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7. What will be the output of the following C code?

#include <assert.h> 
#include <stdio.h>
#include <stdlib.h> 
void Assert (char *mesg) 
{
   fputs (mesg, stderr); 
   fputs (" -- assertion failed\n" , stderr); 
   abort () ; 
}

a) prints only assertion message
b) program is just aborted
c) prints assertion message and aborts
d) no action takes place
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8. Which macro can be used to detect and report exceptional conditions?
a) extern
b) edom
c) assert
d) lbdl_min 1e-37
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9. What will be the output of the following C code?

#include <assert.h> 
#include <stdio.h>  
void main() 
{ 
   int n=11; 
   char str[50]="program";
   assert(n >= 10); 
   printf(" output: %d\n", n); 
   assert(str != NULL); 
   printf("output: %s\n", str); 
}

a) output: 11
b) error message
c)

output: 11
output: program

d) output: program
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10. What will be the output of the following C code?

#include <assert.h> 
#include <stdio.h>  
void main() 
{ 
   int n=12; 
   char str[50]="";
   assert(n >= 10); 
   printf(" output: %d\n", n); 
   assert(str != NULL); 
   printf("output: %s\n", str); 
}

a)

   output: 12
   output: 

b) output: 12
c)

  output: 12
  assertion error

d) error
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