How to add a char/int to an char array in C?

Question

How can I add \'.\' to the char Array := \"Hello World\" in C, so I get a char Array: \"Hello World.\" The Question seems simple but I\'m struggling.

Tried the follo

Answer 1

Suggest replacing this:

char str[1024];
char tmp = '.';

strcat(str, tmp);

with this:

char str[1024] = {'\0'}; // set array to initial all NUL bytes
char tmp[] = "."; // create a string for the call to strcat()

strcat(str, tmp); //