I can’t believe how many times I forget this trick! so I am writing it down so I won’t forget it!
Normally when you use printf function with “%s” formatting to print a string (char *) you rely on C convention of terminating a string with a NULL character (i.e. value 0).
So if you want to print small part of longer string, you copy the part you need to a new buffer and terminate it will NULL.
A better way is to use printf format for string i.e. “%s” with a precision which indicates how many characters will be used:
char *s = "Hi my name is Rayed, nice to meet you!"; printf("Hello, %.5s!\n", s+14);
If the length is not known in advance you can provide it as an argument to printf too:
char *s = "Hi my name is Rayed, nice to meet you!"; printf("Hello, %.*s!\n", 5, s+14);
Notice the “%.*s” and the extra “5” argument.