Test by Bikram | Programming | Test 2 | Question: 3

Question

What is the output of this program?

#include <stdio.h>
#include <string.h>
int main()
{
    char string[] = "Hello";
    printf("%lu %lu", sizeof(string), strlen(string));
    return 0;
}

• A. $5 \ 6$
• B. $5 \ 5$
• C. $6 \ 5$
• D. $6 \ 6$

Answer 1

C.  6 5

• sizeof() counts the number of characters in the string, including the null character. (It actually tells you how much memory an object takes. Since each charachter in C++ takes one byte, a string takes as much memory as the number of characters in it, including the null character.)
  
  https://en.cppreference.com/w/cpp/language/sizeof
   
• strlen() computes the number of characters in the string, ignoring the null character.
  
  https://en.cppreference.com/w/cpp/string/byte/strlen

 

sizeof("Hello") = 6.

strlen("Hello") = 5. 

 

https://ideone.com/oi9ANE

Comments

i am confused with strlen() here mentioned strlen compute the number of character in the string ignoring the null character .but i saw a question on go( programming in c:gate 2004-23) where  null character is also included to count the lenth of string.

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https://gateoverflow.in/?qa=blob&qa_blobid=15045614339529561886

please see this question.

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strlen() will return length as 6 and p[0]=s[6-0] will print nothing.