There are numerous functions available in C to achieve the purpose of finding different positions of a substring with a string.
strstr():
To obtain the first occurrence of substring in a string the function used is strstr().
The syntax for this function is
char *strstr( const char *str1, const char *str2 );
The header file that must be included while using this function strstr() is <string.h>
In the above the function strstr() returns a pointer to the first occurrence of str2 in str1. If no match is found then NULL is returned.
strrstr():
This function is used to obtain the last occurrence of substring in a string.
The syntax for this function is
strrstr(const char *s, const char *subs );
The header file that must be included while using the function strrstr() is <sdgstd.h>
This returns a pointer which points to the last occurrence of a substring within another string. If the substring is not found, this will be the NULL pointer.
How to determine different positions of substrings within a string in C?
There are numerous functions available in C to achieve the purpose of finding different positions of a substring with a string.
To obtain the first occurrence of substring in a string the function used is strstr().
The syntax for this function is
The header file that must be included while using this function strstr() is <string.h>
In the above the function strstr() returns a pointer to the first occurrence of str2 in str1. If no match is found then NULL is returned.
This function is used to obtain the last occurrence of substring in a string.
The syntax for this function is
The header file that must be included while using the function strrstr() is <sdgstd.h>
This returns a pointer which points to the last occurrence of a substring within another string. If the substring is not found, this will be the NULL pointer.
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