1 #pragma mark buffer string create 2 void stringCreate() 3 { 4     NSMutableString *mutStr = [[NSMutableString alloc] initWithCapacity:10]; 5     [mutStr setString:@"Go!"]; 6     NSLog(@"%@", mutStr); 7     [mutStr appendString:@"Hello"]; 8     [mutStr appendFormat:@",age is %i and height is %.2f", 12, 1.54]; 9     NSLog(@"%@", mutStr);10    11     //Replace string12     NSRange r = [mutStr rangeOfString:@"age"];13     [mutStr replaceCharactersInRange:r withString:@"number"];14     NSLog(@"%@", mutStr);15    16     //Insert string17     [mutStr insertString:@"insert" atIndex:2];18     NSLog(@"%@", mutStr);19    20     //Delete string21     NSRange r2 = [mutStr rangeOfString:@"height"];22     [mutStr deleteCharactersInRange: r2];23     NSLog(@"%@", mutStr);24 }