How to allocate memory to a string in C?

Applications Programming
1

hi
I want to take string as a input from user and the string is very very length. From the lengthy string i have to substring take first 16 letters, then next 8 letters,................... Please guide me how to write program to take lengthy string from user and sub string it.
Thanks

2

The string is what? I don't understand.

How is this different from taking the first 24 letters?

3

Your question is not clear. Try to post your code. So that we can see what is wrong in that and then correct it.

4

check this website
Substring(start, end, str) in c - Dev Shed

5

hi
Here is the working code
/* This method takes String, Start Length and End Length as input parameters, sub string the string and returns it */

char* getsubstring(const char* urstr, size_t beginL, size_t len)
{
if (urstr == 0 || strlen(urstr) == 0 || strlen(urstr) < begin || strlen(urstr) < (beginL+len))
return 0;
return strndup(urstr + beginL, len);
}

Thanks