How can I do summation fields of soap web service in ios? -

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i want summation fields of web service.

i have 4 label.it show me fields of soap web service.my 3 labels ok dont know how collect total ??

label1(amountx)=100,label2(amounty)=200,label3(amountz)=300,total(amountx+amounty+amountz) = (it must 600)

didstart

-(void)parser:(nsxmlparser *)parser didstartelement:(nsstring *)elementname namespaceuri: (nsstring *)namespaceuri qualifiedname:(nsstring *)qname attributes:(nsdictionary     *)attributedict{   if ( [elementname isequaltostring:@"amountx"] ) {    if (!soapresults) {   soapresults = [[nsmutablestring alloc] init];     }    recordresults = yes;     }   if ( [elementname isequaltostring:@"amounty"] ) {   if (!soapresults) {    soapresults = [[nsmutablestring alloc] init];      }     recordresults = yes;    }   if ( [elementname isequaltostring:@"amountz"] ) {   if (!soapresults) {    soapresults = [[nsmutablestring alloc] init];     }     recordresults = yes;    }       if ( [elementname isequaltostring:@"total"] ) {   if (!soapresults) {    soapresults = [[nsmutablestring alloc] init];     }     recordresults = yes;        }

didend

 - (void)parser:(nsxmlparser *)parser didendelement:(nsstring *)elementname namespaceuri:       (nsstring *)namespaceuri qualifiedname:(nsstring *)qname{      if ( [elementname isequaltostring:@"amountx"] ) {      label1.text = soapresults ;      soapresults = nil;       recordresults = no;       }       if ( [elementname isequaltostring:@"amounty"] ) {      label2.text = soapresults ;       soapresults = nil;    recordresults = no;       }        if ( [elementname isequaltostring:@"amountz"] ) {      label3.text = soapresults ;       soapresults = nil;    recordresults = no;       }           //  total ???      if ( [elementname isequaltostring:@"total"] ) {      total.text = soapresults ;       soapresults = nil;    recordresults = no;       }


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