一个简单的程序要求用c语言递归循环写，写不出来求帮助

这还递归啥啊
array.indexof(x)

用这个

// InternalFindNLSStringEx parameters is not exactly matching kernel32::FindNLSStringEx parameters.
        // Call through to NewApis::FindNLSStringEx so we can get the right behavior
        [System.Security.SecurityCritical]  // auto-generated
        [ResourceExposure(ResourceScope.None)]
        [DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
        [SuppressUnmanagedCodeSecurity]
        private static extern int InternalFindNLSStringEx(IntPtr handle, IntPtr handleOrigin, String localeName, int flags, String source, int sourceCount, int startIndex, string target, int targetCount);