C Preprocessor — Part 2 MCQs with Explanations

I, II, III and IV is the correct answer to “Choose the correct statement. I. The scope of a macro definition need not be the entire program. II. The scope of a macro definition extends from the point of definition to the end of the file. III. New line is a macro definition delimiter. IV. A macro definition may go beyond a line.”. This question is standard in competitive examination syllabi for C Preprocessor.

During Preprocessing is the correct answer to “In which stage the following code #include<stdio.h> gets replaced by the contents of the file stdio.h”. This question is standard in competitive examination syllabi for C Preprocessor.

10..10 is the correct answer to “What will be output after executing following code? #include<stdio.h> # define a 10 void main() { printf("%d..", a); foo(); printf("%d", a); } void foo() { #undef a #define a 50 }”. This question is standard in competitive examination syllabi for C Preprocessor.

30 is the correct answer to “What will be the output of the following C code? #include<stdio.h> #define max 20 main() { #ifndef max #define min 10 #else #define min 30 #endif printf("%d",min); }”. This question is standard in competitive examination syllabi for C Preprocessor.

$hello world is the correct answer to “What will be the output of the following C code? #define display(text) "$" #text main() { printf(display(hello world)); }”. This question is standard in competitive examination syllabi for C Preprocessor.

value of marks=100 is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define Shyam(x) #x int main() { int marks=100; printf("value of %s is = %d\n",Shyam(marks),marks); return 0; }”. This question is standard in competitive examination syllabi for C Preprocessor.

Veda is the correct answer to “What will be the output of the following C code? #include<stdio.h> #define max 100 void main() { #if(max%10) printf("Exam"); #endif printf("Veda"); }”. This question is standard in competitive examination syllabi for C Preprocessor.

#endif is the correct answer to “. . . . . . . . is the preprocessor directive which is used to end the scope of #ifdef.”. This question is standard in competitive examination syllabi for C Preprocessor.

Ignores the pragma statement and executes the program is the correct answer to “In the directive #pragma pack(n), if the value of 'n' is given to be 5, then what happens”. This question is standard in competitive examination syllabi for C Preprocessor.

Dollar is the correct answer to “What will be the output of the following C code? #include<stdio.h> #define INDIA 1 #define US 2 #define CC US main() { #if CC==INDIA printf("Rupee"); #elif CC==US printf("Dollar"); #else printf("Euro"); #endif }”. This question is standard in competitive examination syllabi for C Preprocessor.

8 is the correct answer to “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)); }”. This question is standard in competitive examination syllabi for C Preprocessor.

t*ram=tram is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define p( m ) printf( "t*" #m " = %s", t##m ) char tram[]="tram"; int main() { int x; x=p(ram); }”. This question is standard in competitive examination syllabi for C Preprocessor.

error is the correct answer to “What will be the output of the following C code? #include<stdio.h> #define sf 10 main() { if(sf==100) printf("good"); else { printf("bad"); sf=100; } printf("%d",sf); }”. This question is standard in competitive examination syllabi for C Preprocessor.

hellohi is the correct answer to “What will be the output of the following C code? #include<stdio.h> void main() { #ifndef max printf("hello"); #endif printf("hi"); }”. This question is standard in competitive examination syllabi for C Preprocessor.

False is the correct answer to “The following C code results in an error. #include <stdio.h> #define world( n ) printf( "t^^" #n" = %c", t##n ) int t3=1; int main() { world(3); }”. This question is standard in competitive examination syllabi for C Preprocessor.

F B is the correct answer to “What will be the output of the following C code? #define F abc #define B def #define FB(arg) #arg #define FB1(arg) FB(arg) main() { printf(FB(F B)); FB1(F B); }”. This question is standard in competitive examination syllabi for C Preprocessor.

43 is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define p( n,m ) printf( "%d", m##n ) int main() { p(3,4); }”. This question is standard in competitive examination syllabi for C Preprocessor.

helloworld is the correct answer to “What will be the output of the following C code? #define example(s,n) #s #n main() { printf(example(hello,world)); }”. This question is standard in competitive examination syllabi for C Preprocessor.

good is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define hello( n ) a##n int a3; int main() { int x; x=hello(3); if(x!=0) printf("hi"); else printf("good"); }”. This question is standard in competitive examination syllabi for C Preprocessor.

4 is the correct answer to “What will be the output of the following C code? #include<stdio.h> #define hello main() { #ifdef hello #define hi 4 #else #define hi 5 #endif printf("%d",hi); }”. This question is standard in competitive examination syllabi for C Preprocessor.

hello.@good morning!@ is the correct answer to “What will be the output of the following C code? #define display(text) printf(#text "@") main() { display(hello.); display(good morning!); }”. This question is standard in competitive examination syllabi for C Preprocessor.

t% 3=10 is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define p( n ) printf( "t%%\n" #n " = %d", t##n ) int t3=10; int main() { int x; x=p(3); }”. This question is standard in competitive examination syllabi for C Preprocessor.

4356 is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define p( n,m ) printf( "%d", m##n ) #define q(a,b) printf("%d",a##b) main() { p(3,4); q(5,6); }”. This question is standard in competitive examination syllabi for C Preprocessor.

error is the correct answer to “What will be the output of the following C code? #include<stdio.h> #define hello 10 void main() { printf("%d",hello); #undef hello printf("%d",hello); }”. This question is standard in competitive examination syllabi for C Preprocessor.

error is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define display( n ) printf( "a" #n " = %d", a##n ) int main() { display(3); }”. This question is standard in competitive examination syllabi for C Preprocessor.

#pragma is the correct answer to “The preprocessor directive used to give additional information to the compiler, beyond which is conveyed in the language . . . . . . . .”. This question is standard in competitive examination syllabi for C Preprocessor.

## is the correct answer to “Which of the following operators is used to concatenate two strings without space”. This question is standard in competitive examination syllabi for C Preprocessor.

invalid is the correct answer to “#pragma GCC poison should be followed by a list of identifiers that are . . . . . . . .”. This question is standard in competitive examination syllabi for C Preprocessor.

3 is the correct answer to “In the directive, #pragma pack(n), which of the following is not a valid value of n”. This question is standard in competitive examination syllabi for C Preprocessor.

10 is the correct answer to “What will be the output of the following C code? #include <stdio.h> #define a 2 main() { int r; #define a 5 r=a*2; printf("%d",r); }”. This question is standard in competitive examination syllabi for C Preprocessor.

error is the correct answer to “What will be the output of the following C code? #include<stdio.h> #define max 100 main() { #ifdef max printf("hello"); }”. This question is standard in competitive examination syllabi for C Preprocessor.

100 is the correct answer to “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); }”. This question is standard in competitive examination syllabi for C Preprocessor.

#ifelse is the correct answer to “Which of the following is not a preprocessor directive”. This question is standard in competitive examination syllabi for C Preprocessor.

#undef is the correct answer to “The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define”. This question is standard in competitive examination syllabi for C Preprocessor.

#pragma pack(1) is the correct answer to “The function of __attribute__((packed)); can also be performed using . . . . . . . .”. This question is standard in competitive examination syllabi for C Preprocessor.

#if is the correct answer to “The preprocessor directive which checks whether a constant expression results in a zero or non-zero value . . . . . . . .”. This question is standard in competitive examination syllabi for C Preprocessor.

error is the correct answer to “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); }”. This question is standard in competitive examination syllabi for C Preprocessor.

error is the correct answer to “What will be the output of the following C code? #define HELLO(a) #a main() { printf(HELLO(good morning)); }”. This question is standard in competitive examination syllabi for C Preprocessor.

It causes the preprocessor to report a fatal error is the correct answer to “The purpose of the preprocessor directive #error is that . . . . . . . .”. This question is standard in competitive examination syllabi for C Preprocessor.

20 is the correct answer to “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); }”. This question is standard in competitive examination syllabi for C Preprocessor.