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Header File string.h Category Memory and String Manipulation Routines, Inline Routines, C++ Prototyped Routines Prototype char *strchr(const char *s, int c); /* C only */ const char *strchr(const char *s, int c); // C++ only char *strchr( char *s, int c); // C++ only wchar_t *wcschr(const wchar_t *s, int c); unsigned char * _mbschr(const unsigned char *s, unsigned int c); Description Scans a string for the first occurrence of a given character. strchr scans a string in the forward direction, looking for a specific character. strchr finds the first occurrence of the character c in the string s. The null-terminator is considered to be part of the string. For example: strchr(strs,0) returns a pointer to the terminating null character of the string strs. Return Value strchr returns a pointer to the first occurrence of the character c in s; if c does not occur in s, strchr returns null

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потом береш свой едит

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void __fastcall TForm1::Button1Click(TObject *Sender) { char *mas; char *pos; mas = Edit1->Text.c_str(); pos = strchr(mas, 'd'); Edit1->Text = pos; }