Pointers<\/p>\n
\nint* pnum1 = NULL;
\nint num1 = 10;
\npnum1 = & num1;
\n++*pnum1;
\n*pnum1 += 10
\ncout << \"num1 is now: \" << num1 << endl;
\n\/\/ num1 should be 21
\n<\/code><\/ul>\n<\/li>\n- Pointers to char\n
\n- char* can be initialized with a string literal<\/li>\n
- char* pproverb = “A miss is as good as a mile”;\n
\n- Ends with \\0<\/li>\n
- \/\/ Print out the string<\/li>\n
- cout << pprover << endl;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
References<\/p>\n
\n- A reference is an alias for another variable\n
\n- so the variable it’s referencing needs to be declared first<\/li>\n
- a reference can’t be reassigned to another variable<\/li>\n<\/ul>\n<\/li>\n
- Declare and initialize\n
\n- long number = 0;<\/li>\n
- long& rnumber = number; \/\/ rnumber is an alias to number now<\/li>\n
- rnumber += 10; \/\/ same as number += 10;<\/li>\n<\/ul>\n<\/li>\n
- If we use pointer then\n
\n- long number = 0;<\/li>\n
- long* pnumber = &number; \/\/ pnumber stores the address of number variable<\/li>\n
- *pnumber += 10; \/\/ pnumber has to be de-referenced<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
Pointers Why pointers Faster array operation Access large blocks of data out of functions Allocate memory space dynamically at runtime Declare and initialize a pointer long* pnumber = NULL; long* pnumber2 = &number2; Assign memory address to a pointer Using … Continue reading