String h C Tutorial

Item Value
Header filestring.h
Declarationsize_t strspn(const char *str1, const char *str2);
Returnreturns the index of the first character in *str1 that does not match any of the characters in *str2.

#include 
  #include 
  int main(void)
  {
    int len;
    len = strspn("this is a test", "hi");
    printf("%d", len);
    return 0;
  }
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