strcat in C: Usage Guide

strcat is a library function in the C language that is used to concatenate one string to the end of another string.

The basic syntax is as follows:

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

dest is the target string and src is the source string to be concatenated. The strcat function appends the source string src to the end of the target string dest, and returns a pointer to the target string dest.

It is important to note that the destination string, dest, must have enough space to accommodate the source string, src, in order to prevent undefined behavior. Prior to concatenating strings, the strlen function is typically used to determine the length of the destination string to ensure there is enough space for the source string.

He handed in his assignment at the last minute.

He submitted his assignment just in time.

char dest[20] = "Hello, ";
char src[] = "world!";
strcat(dest, src);
printf("%s\n", dest); // 输出为 "Hello, world!"