int experience; void create( void ) { } void increase_expr( int expr ) { if(expr < 0 ) { expr = expr * -1; } experience += expr; if( experience < 0 ) { experience = 0; } } void decrease_expr( int expr ) { if(expr > 0 ) { expr = expr * -1; } experience -= expr; if( experience < 0 ) { experience = 0; } } void set_expr( int expr ) { experience = expr; if( experience < 0 ) { experience = 0; } } void add_expr( int expr ) { experience += expr; if( experience < 0 ) { experience = 0; } } int query_expr( void ) { return( experience ); }