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int main() {
    const char constant = 'A';
 
/* Pointer itself is modifiable, referenced value is immutable */
    const char *ptr1 = &constant;
    *ptr1 = 'B';
 
/* Pointer itself is immutable, referenced value is modifiable */
    char * const ptr2 = &constant;
    *ptr2 = 'C';
 
/* Alternate form for case 2 */
    typedef char* PChar;
    const PChar ptr3 = &constant;
    *ptr3 = 'D';
 
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6: error: assignment of read-only location ‘* ptr1’
prog.cpp:9: error: invalid conversion from ‘const char*’ to ‘char*’
prog.cpp:14: error: invalid conversion from ‘const char*’ to ‘char*’

Standard output is empty