String reassembly, string insertion, substitution, deletion, stitching

/* <span style= "White-space:pre" ></span>1> multiple data stitching into a string 2> the end of the string appends a new character 3> inserts a string in the specified range 4> Replace the original character with the new character 5> remove certain characters from the string 6> the space in the string */#import <foundation/foundation.h>int main (int argc, const        char * argv[]) {@autoreleasepool {int year = 2015;        int month = 07;        int day = 20;        NSString * address = @ "Beijing";        NSString * dateandaddress = [[NSString alloc] initwithformat:@ "%d%d months%d days address:%@", year,month,day,address];                      NSLog (@ "%@", dateandaddress);        NSString * str2 = @ "Qianfeng";        qianfeng.com nsstring *STR3 = [str2 stringbyappendingstring:@ ". com"];                        NSLog (@ "STR3%@ str2%@", STR3,STR2);        NSString * STR4 = @ "www..com";        www.baidu.com Nsrange range = {3,2};        NSString * STR5 = [STR4 stringbyreplacingcharactersinrange:range withstring:@ "-baidu-"];                        NSLog (@ "STR5%@", STR5); NSString * STR6 = @ "www.baidu.coM ";        NSString * STR7 = [STR6 stringbyreplacingoccurrencesofstring:@ "." withstring:@ "-"];                NSLog (@ "Str7%@", STR7);              5> remove certain characters in the string NSString * str8 = @ "www..baidu..com";        NSString * STR9 = [str8 stringbyreplacingoccurrencesofstring:@ "." withstring:@ ""];                       NSLog (@ "STR9%@ str8%@", str9,str8);        NSString * str10 = @ "www baidu com";        NSString * Str11 = [Str10 stringbyreplacingoccurrencesofstring:@ "" withstring:@ ""];    NSLog (@ "Str11%@", Str11); } return 0;}

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String reassembly, string insertion, substitution, deletion, stitching