C Programming - Pointers - Discussion
Discussion Forum : Pointers - Find Output of Program (Q.No. 4)
4.
What will be the output of the program ?
#include<stdio.h>
int main()
{
char str[20] = "Hello";
char *const p=str;
*p='M';
printf("%s\n", str);
return 0;
}
Discussion:
69 comments Page 4 of 7.
Prasad said:
1 decade ago
Guys a pointer variable whose address never changed is called pointer constant. So here we can't change the address but we can change the value at that address
int x=10;
int *const p=&x;
int y=50;
p=&y;// wrong
And constant pointer means whose value can never be changed
const int *p;
int x=10;
p=&x;
*p=20;// can't modify the existing value..
int x=10;
int *const p=&x;
int y=50;
p=&y;// wrong
And constant pointer means whose value can never be changed
const int *p;
int x=10;
p=&x;
*p=20;// can't modify the existing value..
M.Bhagya said:
1 decade ago
Here p contains the base address and that value H is replaced by M.
Tulshiram said:
1 decade ago
As given example
char*const t="Hello";
in this statement we have see pointer is constant but String t is not that why next statement
*t='M';
it is a String pointer which point base address is nothing but 'H'
so it will replace with it and give output: "Mello"
char*const t="Hello";
in this statement we have see pointer is constant but String t is not that why next statement
*t='M';
it is a String pointer which point base address is nothing but 'H'
so it will replace with it and give output: "Mello"
M@c said:
1 decade ago
If I change , Then what will be the o/p ?
char str[20] = "Hello";
char *const p=str;
// 1)
*p='Ma';
// 2)
*p='Mah';
Tell me for both the cases.
char str[20] = "Hello";
char *const p=str;
// 1)
*p='Ma';
// 2)
*p='Mah';
Tell me for both the cases.
Jagadish said:
1 decade ago
As p is a constant pointer how we can change the value when it is assigned?
Dragon said:
1 decade ago
If we put *p=bye then answer is eello.
Can any one explain how?
Can any one explain how?
Sushama said:
1 decade ago
Here p is the base address of str, we only modify the base address to m &then str becomes "mello".
Seema said:
1 decade ago
Here p is constant pointer and not pointer to constant.
So we can change the value of str using p but we can't assign new address to p.
So we can change the value of str using p but we can't assign new address to p.
Karthi said:
1 decade ago
char const*p is represent a constant pointer p not the value it holds so you can change the value but in const char*p is vice versa.
Himanshu said:
1 decade ago
We are not modifying the string of str ,
Then how it can change.
char str[20] = "Hello";
char *const p=str;
*p='M';
printf("%s\n", str);
Here we have not change the str[20] = "Hello".
I didn't get,
Please Tell me the reason.
Then how it can change.
char str[20] = "Hello";
char *const p=str;
*p='M';
printf("%s\n", str);
Here we have not change the str[20] = "Hello".
I didn't get,
Please Tell me the reason.
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