Pointer Arithmetic With Strings
Extend your knowledge about pointer arithmetic using strings.
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Introduction
Pointer arithmetic with strings works the same as pointer arithmetic with other array types.
However, keeping in mind that the size of char
is 1 byte, we can simply apply the pointer arithmetic rules.
For char *ptr;
, ptr + 5
will add 5 * sizeof(char)
, which is equal to 5
. Then, we can omit thinking about the size of the data type and doing multiplication because the size is 1
.
If we had an int
pointer, ptr + 5
will add 5 * sizeof(int) = 5 * 4 = 20
. We have to do one more multiplication step, which we can omit for char
arrays.
Pointer arithmetic example
Consider the following example:
char* str = "abcd";
str
points to the first element inside the string. It’s the character'a'