C Programming - Const - Discussion
Discussion Forum : Const - Find Output of Program (Q.No. 6)
6.
What will be the output of the program?
#include<stdio.h>
int main()
{
const char *s = "";
char str[] = "Hello";
s = str;
while(*s)
printf("%c", *s++);
return 0;
}
Answer: Option
Explanation:
Step 1: const char *s = ""; The constant variable s is declared as an pointer to an array of characters type and initialized with an empty string.
Step 2: char str[] = "Hello"; The variable str is declared as an array of charactrers type and initialized with a string "Hello".
Step 3: s = str; The value of the variable str is assigned to the variable s. Therefore str contains the text "Hello".
Step 4: while(*s){ printf("%c", *s++); } Here the while loop got executed untill the value of the variable s is available and it prints the each character of the variable s.
Hence the output of the program is "Hello".
Discussion:
23 comments Page 1 of 3.
Ckbrave13 said:
2 decades ago
Here 'str' points to location of 'H'.When s = str ,'s' contains location of 'H'.'*s' points to 'H' and each time it increments it prints "HELLO".
Mohini said:
1 decade ago
while(*s)
this condition says that while loop will get executed till there is no NULL,i.e end of string.
so it will go on printing each character till the end of string.
thus whole string gets printed
this condition says that while loop will get executed till there is no NULL,i.e end of string.
so it will go on printing each character till the end of string.
thus whole string gets printed
Madhu said:
1 decade ago
Here *s is a constant pointer how can it's value be changed from 'NULL' to 'str' .
Am12cs said:
1 decade ago
Mohini concept is correct, while loop be excuted untill its value comes to null.
Pallavi said:
1 decade ago
Here s points to the empty string and it is a constant pointer, then how can we assign string 'str' to 's'?
Chandu said:
1 decade ago
Here they are allocating location address of characters but till it is constant pointer we can't change its values.
Khushi said:
1 decade ago
Can anyone explain this in detail? how can we assign a const pointer different values each time?
Nuzhat memon said:
1 decade ago
Const pointer can change its value not an address.
Mahesh napte said:
1 decade ago
Pointer can not be constant but it can store address af constant datatypes.
Suresh Kumar said:
1 decade ago
Yes, s is a pointer to a constant character, and is initialized by "", thus the location to which s points can be changed, but the location cannot be changed using s, the while loop simply iterates over the string to give output "hello".
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