strcpy vs strncpy: Key Differences in C

Strcpy and strncpy are both functions used to copy strings, but they have some differences between them.

1. The strcpy function copies the entire string until it encounters the string termination character ‘\0’, while the strncpy function specifies the number of characters to copy; if the length of the source string is less than the specified number, it will add the ‘\0’ termination character at the end of the target string.
2. When the length of the source string exceeds that of the target string, the strcpy function may cause a buffer overflow issue, while the strncpy function will limit the number of characters copied to prevent overflow.
3. When using the strcpy function to copy a string, it is not possible to determine the length of the source string, which can lead to memory access issues; however, using the strncpy function allows to specify the number of characters to copy, ensuring that it does not exceed the length of the destination string.