strcat() function in C/C++ with Example
In C/C++, strcat() is a predefined function used for string handling, under string library (string.h in C, and cstring in C++).
This function appends the string pointed to by src to the end of the string pointed to by dest. It will append a copy of the source string in the destination string. plus a terminating Null character. The initial character of the string(src) overwrites the Null-character present at the end of the string(dest).
The behavior is undefined if:
- the destination array is not large enough for the contents of both src and dest and the terminating null character
- if the string overlaps.
- if either dest or src is not a pointer to a null-terminated byte string.
char *strcat(char *dest, const char *src)
Parameters: The method accepts the following parameters:
- dest: This is a pointer to the destination array, which should contain a C string, and should be large enough to contain the concatenated resulting string.
- src: This is the string to be appended. This should not overlap the destination.
Return value: The strcat() function returns dest, the pointer to the destination string.
Application: Given two strings src and dest in C++, we need to append string pointed by src to the end of the string pointed by dest.
Input: src = "ForGeeks" dest = "Geeks" Output: "GeeksForGeeks" Input: src = "World" dest = "Hello " Output: "Hello World"
Below is the C program to implement the above approach:
The target string should be made big enough to hold the final string.