What is the usage of strstr function in C language?

The "strstr(str1,str2)" function in the C language is used to determine whether the string "str2" is a substring of "str1"; if so, the function returns "str2" in "str1" The address of the first occurrence; otherwise NULL is returned. Its syntax is "* strstr(str1,str2)".

strstr(str1,str2) function is used to determine whether the string str2 is a substring of str1. If so, the function returns the address of the first occurrence of str2 in str1; otherwise, NULL is returned.

C Language

Included file: string.h

Function name: strstr

Function prototype:

extern char *strstr(char *str1, const char *str2);

Syntax:

* strstr(str1,str2)

str1: The target to be searched string expression to search.

str2: The object to be searched The string expression to find.

Return value: If str2 is a substring of str1, return the address of the first occurrence of str2 in str1; if str2 is not a substring of str1, return NULL.

Example:

char str[]="1234xyz";
char *str1=strstr(str,"34");
cout << str1 << endl;

displays: 34xyz

Recommended tutorial: "C Language"

The above is the detailed content of What is the usage of strstr function in C language?. For more information, please follow other related articles on the PHP Chinese website!