stripos — Find position of first occurrence of a case-
insensitive string
int stripos ( char* haystack, char* needle, int offset )
Returns the numeric position of the first occurrence of
needle in the haystack string. Note that the needle may be
a string of one or more characters. If needle is not found,
stripos() will return -1.
The function should not make use of any C library function
calls.
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Answer / Sampurnanand Tripathi
This is a function in C that returns the numeric position of the first occurrence of the 'needle' string within the 'haystack' string, ignoring case sensitivity. If 'needle' is not found, it will return -1. Here's an example implementation:
```c
#include <stdio.h>
#include <string.h>
int stripos(char *haystack, char *needle) {
int len_needle = strlen(needle);
int i;
for (i = 0; haystack[i] != ' '; ++i) {
if (strncasecmp(&haystack[i], needle, len_needle) == 0) {
return i;
}
}
return -1;
}
```
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C 
