1. What is the output of this C code?
-
#include <stdio.h> -
#define SYSTEM 20 -
int main()
-
{ -
int a = 20;
-
#if SYSTEM == a -
printf("HELLO ");
-
#endif -
#if SYSTEM == 20 -
printf("WORLDn");
-
#endif -
}
a) HELLO
b) WORLD
c) HELLO WORLD
d) No Output
Answer
Answer: b [Reason:] None.
2. Comment on the following code?
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#include <stdio.h> -
#define Cprog -
int main()
-
{ -
int a = 2;
-
#ifdef Cprog -
a = 1;
-
printf("%d", Cprog);
-
}
a) No output on execution
b) Output as 1
c) Output as 2
d) Compile time error
Answer
Answer: d [Reason:] None.
3. The “else if” in conditional inclusion is written by?
a) #else if
b) #elseif
c) #elsif
d) #elif
Answer
Answer: d [Reason:] None.
4. What is the output of this C code?
-
#include <stdio.h> -
#define COLD -
int main()
-
{ -
#ifdef COLD -
printf("COLDt");
-
#undef COLD -
#endif -
#ifdef COLD -
printf("HOTt");
-
#endif -
}
a) HOT
b) COLD
c) COLD HOT
d) No Output
Answer
Answer: b [Reason:] None.
5. Which of the following sequences are unaccepted in C language?
a) #if
#else
#endif
b) #if
#elif
#endif
c) #if
#if
#endif
d) #if
#undef
#endif
Answer
Answer: c [Reason:] None.
6. In a conditional inclusion, if the condition that comes after the if holds.
a) Then the code up to the following #else or #elif or #endif is compiled
b) Then the code up to the following #endif is compiled even if #else or #elif is present
c) Then the code up to the following #eliif is compiled
d) None of the mentioned
Answer
Answer: a [Reason:] None.
7. Conditional inclusion can be used for
a) Preventing multiple declarations of a variable
b) Check for existence of a variable and doing something if it exists
c) Preventing multiple declarations of same function
d) All of the mentioned
Answer
Answer: d [Reason:] None.
8. The #elif directive cannot appear after the preprocessor #else directive.
a) True
b) False
c) None of the mentioned
d) Varies
Answer
Answer: a [Reason:] None.
