Let us consider the below program.
Output of the program is str1 is geeks, str2 is forgeeks. So the above swap() function doesn’t swap strings. The function just changes local pointer variables and the changes are not reflected outside the function.
Let us see the correct ways for swapping strings:
Method 1(Swap Pointers)
If you are using character pointer for strings (not arrays) then change str1 and str2 to point each other’s data. i.e., swap pointers. In a function, if we want to change a pointer (and obviously we want changes to be reflected outside the function) then we need to pass a pointer to the pointer.
This method cannot be applied if strings are stored using character arrays.
Method 2(Swap Data)
If you are using character arrays to store strings then preferred way is to swap the data of both arrays.
This method cannot be applied for strings stored in read-only block of memory.
Please write comments if you find anything incorrect in the above article, or you want to share more information about the topic discussed above.
- Why "&" is not used for strings in scanf() function?
- Count of strings that become equal to one of the two strings after one removal
- Swap two variables in one line in C/C++, Python, PHP and Java
- Storage for Strings in C
- Program to check if two strings are same or not
- Converting Strings to Numbers in C/C++
- How to write long strings in Multi-lines C/C++?
- How to convert C style strings to std::string and vice versa?
- arc function in C
- fegetexceptflag() function in C/C++
- putchar() function in C
- vswprintf() function in C/C++
- Inline function in C
- clock() function in C/C++
- toupper() function in C