How to write data to file in C?

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# 1  
Old 06-05-2011
How to write data to file in C?

I want to open a file and write data in the following manner.
String 1 String 2
String 3 String 4
String 5 String 6

How to write in this way? I have a lengthy string and am substring it according to my requirement. Whenever i substring it i have to write it to file in the above manner? How?
# 2  
Old 06-06-2011
This is a very vague question. Please show us
1. some sample data - the starting data, what you expect for output
2. show us the code you have so far.
# 3  
Old 06-07-2011
It's a very simple question and just need of good understanding. This is the code how i got it.
fprintf(fp,"\nString1:%s \t\t\t\t\t\tString2:%s", str1,str2);
That's it.
# 4  
Old 06-07-2011
I have a lengthy string and am substring it according to my requirement.  Whenever i substring it i have to write it to file in the above

We don't understand this part, show us an example.
# 5  
Old 06-07-2011
am using the below code to get substring
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);

/* Main Program */

fprintf(fp,"\nString1:%s \t\t\t\t\t\tString2:%s", getsubstring(str1,10,2), getsubstring(str2,20,2);

That's it.
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