+ 3

Why this code output nothing ?? Help plz

#include<stdlib.h> #include<stdio.h> #include<string.h> int main(){ char *str ="12345"; printf("%s",*str); return 0; } // output : nothing why ?

20th Mar 2022, 7:58 PM
Mik
Mik - avatar
4 Antworten
+ 8
Mik_RDC the %s format specifier needs a pointer. Remove the dereference and it will work. Change: printf("%s",*str); To: printf("%s",str);
20th Mar 2022, 8:17 PM
Brian
Brian - avatar
+ 3
Mik_RDC I'll give a short backgrounder that might clarify: The character string "12345" is stored at some location in memory. The location has a unique numeric address. If we store the address in a variable, p, then p is a pointer to the data. p has its own memory location just like an integer variable. If you print the contents of p as a numeric value, it shows the memory address of "12345". This is the pointer value that %s needs to locate the string. For other purposes use *p to access the data that p refers to. This is called "dereferencing the pointer". For instance, in printf("%c", *p), the specifier %c prints a single character. It expects a character value, not an address like %s does, so *p is appropriate. It prints the first character of the string, which is '1'.
21st Mar 2022, 5:03 AM
Brian
Brian - avatar
+ 3
Big thanks bro Brian
21st Mar 2022, 8:53 AM
Mik
Mik - avatar
+ 2
Brian * (asterix) is'nt use to access pointer value ?
21st Mar 2022, 12:40 AM
Mik
Mik - avatar