C String Concatenation: strcat, strncat & More

In C language, strings can be concatenated using the following methods:

1. The strcat() function is used to concatenate one string at the end of another string. Its function prototype is:

char *strcat(char *dest, const char *src);

dest is the target string, while src is the source string to be appended. It is important to ensure that the target string has enough space to accommodate the source string.

1. The strncat() function is also used to concatenate one string to the end of another, but it allows for specifying the maximum number of characters to concatenate. Its function prototype is:

char *strncat(char *dest, const char *src, size_t n);

dest and src have the same meaning as above, while n represents the maximum number of characters to be concatenated.

1. The sprintf() function can concatenate multiple strings into one string and store the result in a target string. Its function prototype is:

int sprintf(char *str, const char *format, ...);

In this case, str is the target string, and format is the formatting string used to specify the format of the strings to be concatenated.

1. Manual concatenation: It is possible to manually concatenate strings using loops and pointers, although this method can be cumbersome, it is also an effective way of concatenating strings.

Above are several common methods for concatenating strings in C language, choose the appropriate method based on the actual situation to achieve string concatenation.