M

5

c

Magic

Code Understanding

const char *c=”Magic”;
Here c is a pointer type variable that has been initialised with a string literal. The const specifier is needed because from c++ 2003 version on wards string literals are immutable (constant values)

cout<<c[0]<<endl;
This will print M as value at 0th address is M treating as if string literal is a read only array.

int len=strlen(c);
Pointer variables allow string functions.

cout<<len<<endl;
This will print length as 5.

cout<<c[len-1]<<endl;
This will print the last character as last character is denoted by len-1.

//c[4]=’x’;
This has been commented as this can create problems in c++ 2003 version on wards. In previous version this can be done.

cout<<c<<endl;
Pointer variable can be used directly to print whole string, treating them as null terminated string.

Notes

• Documentation of most string functions will depict parameter to be passed as pointer variable only.

Suggested Filename(s): charptr.cpp, ptr2slit.cpp