objective c - Why can't I increment the variable one by one? -


whenever click button flipbutton once, variable curpage added 4. want increment one. tell me wrong? thanks

- (void)viewdidload {     [super viewdidload];     // additional setup after loading view.     curpage = 0 ;     nsstring * dic = nil;     if ((nsinteger)tempindex == 0) {         type = @"fire_";         dic = [nsstring stringwithformat:@"%@%d",type,0];     }     nsstring *htmlfile = [[nsbundle mainbundle] pathforresource:dic oftype:@"htm"];     nsstring* htmlstring = [nsstring stringwithcontentsoffile:htmlfile  encoding:nsutf8stringencoding error:nil];     [contentwebview loadhtmlstring:htmlstring baseurl:nil];     uibarbuttonitem *flipbutton = [[uibarbuttonitem alloc]                                    initwithtitle:@"flip"                                    style:uibarbuttonitemstylebordered                                    target:self                                    action:@selector(flipview)];     self.navigationitem.rightbarbuttonitem = flipbutton; }  -(ibaction)flipview{     curpage = curpage + 1;     nsstring *path = [nsstring stringwithformat:@"%@%d",type,(int)curpage];     nsstring *htmlfile = [[nsbundle mainbundle] pathforresource:path oftype:@"htm"];     nsstring* htmlstring = [nsstring stringwithcontentsoffile:htmlfile encoding:nsutf8stringencoding error:nil];     [contentwebview loadhtmlstring:htmlstring baseurl:nil];     nslog(path); }

my guess because put asterisk after int when declaring curpage:

int *curpage;

that's reason why compiler insisted on adding (int) in front of curpage when passing stringwithformat:

this declares integer pointer, not integer. pointers increment size of whatever point to, on platforms 32-bit ints increment 4 (the number of bytes taken 32 bits). not need asterisks when declaring variables of primitive types.


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