Thread: Help trying to implement strcpy

Code:

void StrCpy(char * Dest , char* Src )
{
 
  while(*Src){
    *Dest = *Src++;
    cout << *Dest ++;    
    
  }
}

void main()
{  

char* string1 = "\0";
char * string2 = "EL";

StrCpy(string1, string2);
//cout << string1; //must output EL
}

Im trying to output EL after its copied to string1 but nothing its printed

Ummmmmmm you cannot just do this with string literals my friend. Elysia will **** a brick when she catches wind of this code.

Code:

char string1[3];

it works!! .. and I heard of that before but got confused cuz the thing I did was to Initialize char * string1 = "longer than string2" and evrything else the same and it didnt work either so I thought that wasnt the problem as I thought there was a solution without need to "mix" char[] and char *
Could you tell me why using a longer string than string2 to initialize char* pointer wouldnt work in my method
I thought I would get something like this:

char* string 1 = "longer than string2"
char* string 2 = "NONSENSE"

func(string1 string2)//same as before
cout << string1 ; //I was expecting it to print changed string1 as
"NONSENSEhan string2"
in other words overwritting

If you do char *string1 = "it doesn't matter what this is", you CANNOT write to the characters pointed to by string1. It will always and forever be "it doesn't matter what this is", provided an attempt to change these characters does not shut down your program. A pointer to a string literal is just that -- a pointer to a string literal; it is not a pointer to memory that you own.

Ironically, you have to use strcpy to initialize a string. So you would need this:

Code:

char string1[some_size], string2[some_size];
strcpy(strin1, "\0");
strcpy(string2, "EL");

that is the correct way to do what you thought your code does. The reason is what tabstop said. You use a char to a string literal (what you have) when you want to use that string literal and don't want to change it.
Like:

Code:

char* phrase = "Hey, dude!";
printf("%s", phrase);
strcpy(string1, phrase);
strcpy(string2, phrase);
strcpy(phrase, other_phrase); //this is wrong!