ya,, i think..
first we have declared an pointer variable *p and
assigned a value 20.... but we know that pointers are those
which can hold only the address of another variable..... so
surely in the memory P it wont have 20... so 20 will be
stored in some other unbknown variable in the memory which
wont be visible to user in thesr cases...... that unknown
memory address will be getting stored in this pointer
variable.... so when we give only p or *p it will print 20
and not the address of the unknown location containing
20........... because it will be directly accessible
We are assigning 20 to *p. Which means we are assigning the
address 20 to p. when you want to print the address of the
pointer variable we have to print just p not *p. if you want
to print the value stored in the particular address we need
to print like *p. in this case we are printing p so it will
give the address 20 to it.
this will result in error.... pointer itself cant point to
any value... we, the users must make an explict assignment
for the pointer to point to an value .....
int *p=20;
means
int *p;
p=20;
so the address of p is 20
printf("%d",p);
it prints 20 because now the base address of p is 20
even if we print as
printf("%u",p);
the o/p will be 20
correct ans is
int *p ; // creating a pointer of integer type
*p=20; // we are creating memory for 20 and p is pointing to
it .
printf("%d",p); // prints p 's address
printf("%d",*p); // prints value pointed by p . i.e 20
wrong declarations
we
ERRORS 1.int *p=20;
Study the code:
void show()
main()
{
show();
}
void show (char *s)
{
printf("%sn",s);
}
What will happen if it is compiled & run on an ANSI C
Compiler?
A)It will compile & nothing will be printed when it is
executed
B)it will compile but not link
C)the compiler will generate an error
D)the compiler will generate a warning
24.what is a void pointer?
25.why arithmetic operation can’t be performed on a void
pointer?
26.differentiate between const char *a; char *const a;
and char const *a;
27.compare array with pointer?
28.what is a NULL pointer?
29.what does ‘segmentation violation’ mean?
30.what does ‘Bus Error’ mean?
31.Define function pointers?
32.How do you initialize function pointers? Give an example?
33.where can function pointers be used?
Determine the code below, tell me exactly how many times is
the operation sum++ performed ?
for ( i = 0; i < 100; i++ )
for ( j = 100; j > 100 - i; j--)
sum++;
What is the output for the following program
#include<stdio.h>
main()
{
char a[5][5],flag;
a[0][0]='A';
flag=((a==*a)&&(*a==a[0]));
printf("%d\n",flag);
}
I use turbo C which allocates 2 bytes for integers and 4
bytes for long. I tried to declare array of size 500000 of
long type using the following code...
long *arr;
arr=(long *)(malloc)(500000 * sizeof(long));
It gives a warning that "Conversion may lose significant
digits in function main"...
And the resulting array size was very less around 8400 as
compared to 500000. Any suggestions will be welcomed....
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