OC string intercept convert variable string case

////main.m//string////Created by MAC on 15/12/9.//copyright©2015 year MAC. All rights reserved.//#import<Foundation/Foundation.h>#import<string.h>intMainintargcConst Char*argv[]) {@autoreleasepool {nsstring*name =@"Xiaoren"; intAge = -; NSString*name1 = [NSString stringWithFormat:@"name=%@ age=%d", Name,age]; NSLog (@"%@", name1); Nsuinteger Len=[name1 length]; NSLog (@"%lu", Len); Charc = [name1 Characteratindex:4];//get the 4th index characterNSLog (@"%c", c);  for(intI=0; i<len; i++) {NSLog (@"%c", [name1 characteratindex:i]); } NSData*date = [name1 datausingencoding:nsutf8stringencoding];//convert to 16-binary charactersNSLog (@"%@", date); NSString*name3 = [[NSString alloc]initwithdata:date encoding:nsutf8stringencoding];//Convert hex code to stringNSLog (@"%@", Name3); //Write a fileNSString *str =@"Hello World"; NSString*path =@"/users/mac/desktop/test.txt"; BOOL result= [str writetofile:path atomically:yes encoding:nsutf8stringencoding Error:nil];//Write FileNSLog (@"result=%d", result); NSString*newstring =[NSString Stringwithcontentsoffile:path encoding:nsutf8stringencoding Error:nil]; NSLog (@"%@", newstring); NSLog (@"%@", name1); NSLog (@"%@", [name1 Substringfromindex:5]);//intercept all characters from the fifth postNSLog (@"%@", [name1 Substringtoindex:5]);//intercept the first five charactersNsrange range = Nsmakerange (4,8);//RangeNSLog (@"%@", [name1 Substringwithrange:range]);//intercept strings by range//Character ConversionsNSString *age2 =@" -";//0 If it is not of type intNSString *name2 =@"3.14"; NSString*name5 =@"false"; intA =[Age2 Intvalue]; floatb =[name2 Floatvalue]; NSLog (@"%d", a); NSLog (@"%f", B); BOOL cc=[Name5 Boolvalue]; NSLog (@"%d", CC); //String Case ConversionNSString *STR3 =@"Hello World"; NSLog (@"%@", [STR3 uppercasestring]);//convert to uppercase output HELLO worldNSLog (@"%@", [STR3 lowercasestring]);//Convert to lowercase output Hello worldNSLog (@"%@", [STR3 capitalizedstring]);//Convert to first letter uppercase output Hello world//string comparisonNSString *STR6 =@"a"; NSString*STR7 =@"b"; Nscomparisonresult R=[STR6 COMPARE:STR7]; NSLog (@"%ld",(Long) r);//0 means equal//variable String//variable strings are inherited NSString, and method properties in NSString can be used in nsmutablestring//1. Generally initializes a class with a static method so that no management of memory is the direct access to the method through the class name does not require Alloc//direct access through the class name method does not require management memorynsmutablestring *strr1 = [[nsmutablestring alloc]initwithcapacity:5]; //direct access through the class name method does not require management memorynsmutablestring *MSTR2 = [nsmutablestring stringwithcapacity:Ten]; //Direct Assignment variable string C methodnsmutablestring *MSTR3 = [nsmutablestring stringwithstring:@"Xiaowang"]; //2. Append the length of the string beyond the initialization length will be added automatically[MStr2 appendString:@"Xiaoren"]; [MStr2 appendString:@"20222"]; NSLog (@"%@", MSTR2); //3. Delete charactersNsrange len1 = Nsmakerange (2,4);        [MStr2 Deletecharactersinrange:len1]; NSLog (@"%@", MSTR2); //4. Inserting characters[MStr2 insertstring:@"yy"Atindex:4]; NSLog (@"%@", MSTR2); //5. Replace all replace strings[MStr2 setString:@"Tihuan"]; NSLog (@"%@", MSTR2); }    return 0;}

OC string intercept convert variable string case