Preprocessors
- The below two lines are equivalent to ________.
#define C_IO_HEADER <stdio.h>
#include C_IO_HEADER
-
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NA
Correct Option: A
Since C_IO_HEADER is defined to be <stdio.h>, the second line becomes #include<stdio.h>, since C_IO_HEADER is replaced with <stdio.h>
- What will be the output of the following C code?
#include <stdio.h>
#include "printf"
void main()
{
printf("Welcome");
}
-
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NA
Correct Option: A
Compilation Error
main.c:2:14: fatal error: printf: No such file or directory
#include "printf"
^~~~~~~~
compilation terminated.
- Which of the following file extensions are accepted with #include?
-
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NA
Correct Option: D
The preprocessor will include whatever file extension you specify in your #include statement. However, it is not a good practice as another person debugging it will find it difficulty in finding files you have included.
- Which of the following names for files not accepted?
-
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NA
Correct Option: E
All file names are accepted as for the execution to occur. There are no constraints on giving file names for inclusion.
- What will be the output of the following C code?
#include <stdio.h>
#define function(p, q) p ## q
int main()
{
printf("%s\n", function(a, b));
}
-
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NA
Correct Option: D
Compilation Error
main.c: In function ‘main’:
main.c:5:33: error: ‘ab’ undeclared (first use in this function)
printf("%s\n", function(a, b));
^
main.c:2:28: note: in definition of macro ‘function’
#define function(p, q) p ## q
^
main.c:5:33: note: each undeclared identifier is reported only once for each function it appears in
printf("%s\n", function(a, b));
^
main.c:2:28: note: in definition of macro ‘function’
#define function(p, q) p ## q
