Texas Instruments TI89 Developer Guide - Page 1033

Appendix A: System Routines - Strings 991 strcmp Declaration: int strcmp (const char * s1, const char * s2) Category(ies): Strings Description: Lexicographically compares two strings. Inputs: s1 - Character string. s2 - Character string. Outputs: Returns zero if the strings are identical, a positive number if the string pointed to by s1 is greater than the string pointed to by s2, or a negative number if the string pointed to by s1 is less than the string pointed to by s2. If the strings differ, the value of the first nonmatching character in s2 subtracted from the corresponding character in s1 is returned. Assumptions: None Side Effects: None Availability: All versions of the TI-89 / TI-92 Plus. TI-89 / TI-92 Plus Differences: None See Also: strncmp, memcmp Example: BOOL isSolverVar( char *str ) /* Return TRUE if string str is one of the solver variables else return FALSE. */ { char eqnstr[] = "eqn"; char expstr[] = "exp"; if( (strcmp( str, eqnstr) == 0) || (strcmp( str, expstr) == 0) ) return TRUE; return FALSE; } TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001