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Structures & Unions
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[Q001] What
will be the output of the following program
:
struct
{
int
i;
float
f;
}var;
int
main()
{
var.i=5;
var.f=9.76723;
printf("%d
%.2f",var.i,var.f);
return(0);
}
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(a)Compile-Time Error
(b)5
9.76723
(c)5 9.76
(d)5
9.77
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[Q002] What will be the output of the
following program :
int
main()
{
int
val=1234;
int*
ptr=&val;
printf("%d
%d",val,*ptr++);
return(0);
}
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(a)Compile-Time Error
(b)5
9.76723
(c)5 9.76
(d)5
9.77
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[Q003] What will be the output of the
following program :
struct values
{
int i;
float
f;
};
int main()
{
struct values var={555,67.05501};
printf("%2d %.2f",var.i,var.f);
return(0);
}
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(a)1234
1234
(b)1235 1235
(c)1234
1235
(d)1235 1234
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[Q004] What will be the output of the
following program :
typedef struct
{
int i;
float
f;
}values;
int
main()
{
static values
var={555,67.05501};
printf("%2d %.2f",var.i,var.f);
return(0);
}
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(a)Compile-Time Error
(b)55
67.05
(c)555 67.06
(d)555
67.05
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[Q005] What will be the output of the
following program :
struct my_struct
{
int i=7;
float
f=999.99;
}var;
int
main()
{
var.i=5;
printf("%d
%.2f",var.i,var.f);
return(0);
}
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(a)Compile-Time
Error
(b)7 999.99
(c)5
999.99
(d)None of these
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[Q006] What will be the output of the
following program :
struct first
{
int
a;
float
b;
}s1={32760,12345.12345};
typedef struct
{
char
a;
int
b;
}second;
struct my_struct
{
float
a;
unsigned int
b;
};
typedef struct my_struct third;
int
main()
{
static
second s2={'A',- -4};
third
s3;
s3.a=~(s1.a-32760);
s3.b=-++s2.b;
printf("%d
%.2f\n%c %d\n%.2f
%u",(s1.a)--,s1.b+0.005,s2.a+32,s2.b,++(s3.a),--s3.b);
return(0);
}
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(a)Compile-Time
Error
(b)32760
12345.12
A
4
1 -5
(c)32760
12345.13
a
-5
0.00
65531
(d)32760
12345.13
a
5
0.00
65530
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[Q007] What will be the output of the
following program :
struct {
int
i,val[25];
}var={1,2,3,4,5,6,7,8,9},*vptr=&var;
int
main()
{
printf("%d
%d %d\n",var.i,vptr->i,(*vptr).i);
printf("%d %d %d %d %d
%d",var.val[4],*(var.val+4),vptr->val[4],*(vptr->val+4),(*vptr).val[4],*((*vptr).val+4));
return(0);
}
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(a)Compile-Time
Error
(b)1 1 1
6 6
6 6 6 6
(c)1 1 1
5
5 5 5 5 5
(d)None of these
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[Q008] What will be the output of the
following program :
typedef struct
{
int i;
float
f;
}temp;
void alter(temp *ptr,int x,float
y)
{
ptr->i=x;
ptr->f=y;
}
int
main()
{
temp
a={111,777.007};
printf("%d
%.2f\n",a.i,a.f);
alter(&a,222,666.006);
printf("%d %.2f",a.i,a.f);
return(0);
}
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(a)Compile-Time
error
(b)111
777.007
222
666.006
(c)111
777.01
222
666.01
(d)None of these
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[Q009] What will be the output of the
following program :
typedef struct
{
int i;
float
f;
}temp;
temp alter(temp tmp,int x,float
y)
{
tmp.i=x;
tmp.f=y;
return tmp;
}
int
main()
{
temp
a={111,777.007};
printf("%d
%.3f\n",a.i,a.f);
a=alter(a,222,666.006);
printf("%d %.3f",a.i,a.f);
return(0);
}
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(a)Compile-Time
error
(b)111
777.007
222
666.006
(c)111
777.01
222
666.01
(d)None of these
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[Q010] What will be the output of the
following program :
typedef struct
{
int
i;
float
f;
}temp;
temp alter(temp *ptr,int x,float
y)
{
temp
tmp=*ptr;
printf("%d
%.2f\n",tmp.i,tmp.f);
tmp.i=x;
tmp.f=y;
return
tmp;
}
int
main()
{
temp
a={65535,777.777};
a=alter(&a,-1,666.666);
printf("%d %.2f",a.i,a.f);
return(0);
}
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(a)Compile-Time error
(b)65535
777.777
-1
666.666
(c)65535
777.78
-1
666.67
(d)-1 777.78
-1 666.67
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[Q011] What will be the
output of the following program :
struct my_struct1
{
int
arr[2][2];
};
typedef struct my_struct1
record;
struct my_struct2
{
record
temp;
}list[2]={1,2,3,4,5,6,7,8};
int
main()
{
int
i,j,k;
for (i=1; i>=0;
i--)
for (j=0; j<2;
j++)
for (k=1; k>=0;
k--)
printf("%d",list[i].temp.arr[j][k]);
return(0);
}
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(a)Compile-Time
Error
(b)Run-Time
Error
(c)65872143
(d)56781243
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[Q012] What will be the output of the
following program :
struct my_struct
{
int i;
unsigned int
j;
};
int
main()
{
struct
my_struct
temp1={-32769,-1},temp2;
temp2=temp1;
printf("%d
%u",temp2.i,temp2.j);
return(0);
}
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(a)32767
-1
(b)-32769 -1
(c)-32769
65535
(d)32767 65535
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[Q013] What will be the output of the
following program :
struct names
{
char
str[25];
struct names
*next;
};
typedef struct names slist;
int
main()
{
slist
*list,*temp;
list=(slist *)malloc(sizeof(slist)); // Dynamic Memory
Allocation
strcpy(list->str,"Hai");
list->next=NULL;
temp=(slist
*)malloc(sizeof(slist)); // Dynamic Memory
Allocation
strcpy(temp->str,"Friends");
temp->next=list;
list=temp;
while (temp !=
NULL)
{
printf("%s",temp->str);
temp=temp->next;
}
return(0);
}
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(a)Compile-Time
Error
(b)HaiFriends
(c)FriendsHai
(d)None
of these
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[Q014] What will be the output of the
following program :
(i)
struct A
{
int
a;
struct B
{
int
b;
struct B
*next;
}tempB;
struct A
*next;
}tempA;
(ii) struct B
{
int
b;
struct B
*next;
};
struct A
{
int
a;
struct B tempB;
struct A
*next;
};
(iii) struct B
{
int
b;
}tempB;
struct
{
int
a;
struct B *nextB;
};
(iv) struct B
{
int
b;
struct B
{
int
b;
struct B *nextB;
}tempB;
struct B *nextB;
}tempB;
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(a)
(iv) Only
(b) (iii) Only
(c)All of the
these
(d)None of these
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[Q015] What will be the output of the
following program :
union A
{
char
ch;
int
i;
float
f;
}tempA;
int
main()
{
tempA.ch='A';
tempA.i=777;
tempA.f=12345.12345;
printf("%d",tempA.i);
return(0);
}
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(a)Compile-Time
Error
(b)12345
(c)Erroneous
output
(d)777
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[Q016] What will be the output of the
following program :
struct A
{
int i;
float
f;
union B
{
char ch;
int
j;
}temp;
}temp1;
int
main()
{
struct A
temp2[5];
printf("%d %d",sizeof temp1,sizeof(temp2));
return(0);
}
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(a)6
30
(b)8 40
(c)9 45
(d)None of
these
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[Q017] What will be the output of the following
program :
int
main()
{
static
struct my_struct
{
unsigned
a:1;
unsigned
b:2;
unsigned
c:3;
unsigned
d:4;
unsigned :6; // Fill out first
word
}v={1,2,7,12};
printf("%d %d
%d %d",v.a,v.b,v.c,v.d);
printf("\nSize=%d bytes",sizeof
v);
return(0);
}
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(a)Compile-Time
Error
(b)1 2 7 12
Size=2 bytes
(c)1 2 7
12
Size=4
bytes
(d)None of these
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[Q018] What are the largest values that
can be assigned to each of the bit fields defined in
[Q017] above.
(a)a=0 b=2 c=3 d=4
(b)a=1 b=2
c=7 d=15
(c)a=1 b=3 c=7 d=15
(d)None
of these
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[Q019] What will be the output of the
following program :
int
main()
{
struct sample
{
unsigned
a:1;
unsigned
b:4;
}v={0,15};
unsigned *vptr=&v.b;
printf("%d
%d",v.b,*vptr);
return(0);
}
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(a)Compile-Time
Error
(b)0 0
(c)15 15
(d)None
of these
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[Q020] What will be the output of the
following program :
int
main()
{
static
struct my_struct
{
unsigned
a:1;
int
i;
unsigned
b:4;
unsigned
c:10;
}v={1,10000,15,555};
printf("%d %d %d
%d",v.i,v.a,v.b,v.c);
printf("\nSize=%d bytes",sizeof
v);
return(0);
}
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(a)Compile-Time
Error
(b)1 10000 15
555
Size=4
bytes
(c)10000 1 15
555
Size=4
bytes
(d)10000 1 15
555
Size=5
bytes
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Solutions for the above
queries.
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