C programming/string.h/strcspn

strcspn is the function from the C standard library (header file string.h). It searches the string for certain set of characters. The strcspn() function calculates the length of initial segment of string 1 which does not contain any character from string 2. Return Value This function returns the index of first character in string 1 that matches with any character of string2. Syntax #include <string.h> size_t strcspn( const char *str1, const char *str2 ); Example #include <stdio.h> #include <string.h> int main(){ char s[20] = "wikireader007", t[11] = "0123456789"; printf("The first decimal digit of s is at position: %d.\n", '''strcspn'''(s, t)); return 0; } Output: The first decimal digit of s is at position: 10 References opengroup.org External links strcspn at cplusplus.com strcspn at en.cppreference.com opengroup.org msdn.microsoft.com deep