Replace the string (replace the string content you want to replace directly)/delete (delete the specified location/delete the location you want to delete)/

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {

@autoreleasepool {

Nsmutablestring *mustr1=[[nsmutablestring Alloc]init];

Nsmutablestring *mustr2=[nsmutablestring stringwithformat:@ "Hello"];

Nsmutablestring *mustr3=[[nsmutablestring Alloc]init];

NSString *[email protected] "welcom to OC";

nsmutablestring *[email protected] "welcom to OC"; This is wrong--you cannot assign a string constant directly to Nsmutablestring

Assign value

Mustr1=[nsmutablestring STRINGWITHSTRING:STR];

NSLog (@ "mustr1=%@", MUSTR1);

Replace string

Nsrange rang2=[mustr1 rangeofstring:@ "OC"];

[Mustr1 replacecharactersinrange:rang2 withstring:@ "IOS"];

NSLog (@ "mustr1=%@", MUSTR1);

Insert

[Mustr1 insertstring:@ "student" atindex:6]; Specify position 6 Insert string

[Mustr2 appendstring:@ "teacher!"]; Insert string at end

[Mustr3 appendformat:@ "hey!%@", str]; Formatting the insertion string

NSLog (@ "mustr1=%@", MUSTR1);

NSLog (@ "mustr2=%@", MUSTR2);

NSLog (@ "mustr3=%@", MUSTR3);

Specify location Delete

[Mustr1 Deletecharactersinrange:nsmakerange (7, 8)]; Remove 8 characters at position 7

NSLog (@ "mustr1=%@", MUSTR1);

Find Delete

Nsrange rang1=[mustr2 rangeofstring:@ "Teacher"];

if (rang1.location!=nsnotfound) {

[Mustr2 deletecharactersinrange:rang1];

}

NSLog (@ "mustr2=%@", MUSTR2);

Re-assign Value

[Mustr2 SETSTRING:STR];

NSLog (@ "mustr2=%@", MUSTR2);

}

return 0;

}

Replace the string (replace the string content you want to replace directly)/delete (delete the specified location/delete the location you want to delete)/