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Variable naming rule questions in c
Following question are based on
variable naming rules
in c. If you have any doubt in the variable naming rules you can ask here.
Rules for identifiers in c language
1.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
goto
=5;
printf(
"%d"
,
goto
);
return
0;
}
(A)
5
(B)
**
(C)
**
(D)
Compilation error
(E)
None of these
Explanation:
Invalid variable name.
goto
is keyword in c. variable name cannot be any keyword of c language.
2.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
long
int
1a=5l;
printf(
"%ld"
,1a);
return
0;
}
(A)
5
(B)
51
(C)
6
(D)
Compilation error
(E)
None of these
Explanation:
Invalid variable name. Variable name must star from either alphabet or
underscore.
3.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
_=5;
int
__=10;
int
___;
___=_+__;
printf(
"%i"
,___);
return
0;
}
(A)
5
(B)
10
(C)
15
(D)
Compilation error
(E)
None of these
Explanation:
Variable name can have only underscore.
4.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
max-val=100;
int
min-val=10;
int
avg-val;
avg-val = max-val + min-val / 2;
printf(
"%d"
,avg-val);
return
0;
}
(A)
55
(B)
105
(C)
60
(D)
Compilation error
(E)
None of these
Explanation:
We cannot use special character – in the variable name.
5.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
class=150;
int
public=25;
int
private=30;
class = class >> private - public;
printf(
"%d"
,class);
return
0;
}
(A)
1
(B)
2
(C)
4
(D)
Compilation error
(E)
None of these
Explanation:
Variable name can be keyword of c++.
6.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
abcdefghijklmnopqrstuvwxyz123456789=10;
int
abcdefghijklmnopqrstuvwxyz123456=40;
printf(
"%d"
,abcdefghijklmnopqrstuvwxyz123456);
return
0;
}
(A)
10
(B)
40
(C)
50
(D)
Compilation error
(E)
None of these
Explanation:
Only first 32 characters are significant in variable name. So compiler will show error: Multiple declaration of identifier abcdefghijklmnopqrstuvwxyz123456.
7.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
register
xyz_123=91;
auto
pqr_123=991;
const
_1a1_=pqr_123+~xyz_123;
printf(
"%d"
,_1a1_);
return
0;
}
(A)
900
(B)
999
(C)
899
(D)
Compilation error
(E)
None of these
Explanation:
Variable name can have digits.
8.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
__SMALL__ = 11;
int
y;
y= __SMALL__ < 5;
printf(
"%d"
,y);
return
0;
}
(A)
11
(B)
5
(C)
0
(D)
Compilation error
(E)
None of these
Explanation:
Variable name cannot be global identifier.
9.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
__BIG__ = 32;
int
y;
y= __BIG__ && 8;
printf(
"%d"
,y);
return
0;
}
(A)
32
(B)
8
(C)
1
(D)
Compilation error
(E)
None of these
Explanation:
Variable name can be in the format: __NAME__. But it is bad practice since this format is used for global identifiers.
10.
What will be output of the following c program?
#include
<stdio.h>
static
num=5;
int
num;
extern
int
num;
int
main(){
printf(
"%d"
,num);
return
0;
}
(A)
5
(B)
10
(C)
0
(D)
Compilation error
(E)
None of these
Explanation:
Two or more global variables can have same name but we can initialize only one of them.
11.
What will be output of the following c program?
#include
<stdio.h>
static
num=5;
extern
int
num;
int
main(){
printf(
"%d"
,num);
return
0;
}
int
num =25;
(A)
0
(B)
5
(C)
25
(D)
Compilation error
(E)
None of these
Explanation:
Two or more global variables can have same name but we can initialize only one of them.
12.
What will be output of the following c program?
#include
<stdio.h>
static
num;
int
main(){
printf(
"%d"
,num);
return
0;
}
int
num =25;
(A)
0
(B)
1
(C)
25
(D)
Compilation error
(E)
None of these
Explanation:
Two or more global variables can have same name but we can initialize only one of them.
13.
What will be output of the following c program?
#include
<stdio.h>
int
xyz=10;
int
main(){
int
xyz=20;
printf(
"%d"
,xyz);
return
0;
}
(A)
10
(B)
20
(C)
30
(D)
Compilation error
(E)
None of these
Explanation:
Two variables can have same name in different scope.
14.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
xyz=20;
int
xyz;
printf(
"%d"
,xyz);
return
0;
}
(A)
20
(B)
0
(C)
Garbage
(D)
Compilation error
(E)
None of these
Explanation:
Two local variables cannot have same name in same scope.
15.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
xyz=20;{
int
xyz=40;
}
printf(
"%d"
,xyz);
return
0;
}
(A)
20
(B)
40
(C)
0
(D)
Compilation error
(E)
None of these
Explanation:
Two variables can have same name in different scope.
16.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
main = 80;
printf(
"%d"
,main);
return
0;
}
(A)
80
(B)
0
(C)
Garbage value
(D)
Compilation error
(E)
None of these
Explanation:
Variable name can be main.
17.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
struct
a{
int
a
;
};
struct
a b={10};
printf(
"%d"
,b.
a
);
return
0;
}
(A)
0
(B)
10
(C)
Garbage value
(D)
Compilation error
(E)
None of these
Explanation:
Two variables can have same name in different scope.
18.
What will be output of the following c program?
#include
<stdio.h>
int
main
(){
int
ABC=10;
printf(
"%d"
,abc);
return
0;
}
(A)
10
(B)
0
(C)
5
(D)
Compilation error
(E)
None of these
Explanation:
Variable name is case sensitive.
19.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
printf=12;
printf(
"%d"
,printf);
return
0;
}
(A)
12
(B)
0
(C)
5
(D)
Compilation error
(E)
None of these
Explanation:
Variable name cannot be pre defined function of included header file.
20.
What will be output of the following c program?
#include
<stdio.h>
int
main(){
int
EOF=12;
printf(
"%d"
,EOF);
return
0;
}
(A)
12
(B)
0
(C)
5
(D)
Compilation error
(E)
None of these
Explanation:
Variable name cannot be pre defined function of included header file.
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