指向指针的指针

- (void)test {      NSString *name = @"111";     NSLog(@"name:%@", name);          BOOL success1 = [self changeValue1:name];     if (!success1) {         NSLog(@"name:%@", name);     }          BOOL success2 = [self changeValue2:&name];     if (!success2) {         NSLog(@"name:%@", name);     }          NSInteger age = 10;     NSLog(@"name:%ld", age);          BOOL success3 = [self changeAge1:age];     if (!success3) {         NSLog(@"name:%ld", age);     }          BOOL success4 = [self changeAge2:&age];     if (!success4) {         NSLog(@"name:%ld", age);     }          NSInteger *p_age = &age;     BOOL success5 = [self changeAge3:&p_age];     if (!success5) {         NSLog(@"name:%ld", age);     }      }  - (BOOL)changeValue1:(NSString *)name {          name = @"222";     return NO; }  - (BOOL)changeValue2:(NSString **)name {          *name = @"333";     return NO; }  - (BOOL)changeAge1:(NSInteger)age {     age = 20;     return NO; }  - (BOOL)changeAge2:(NSInteger *)age {     *age = 30;     return NO; }  - (BOOL)changeAge3:(NSInteger **)age {     **age = 40;     return NO; }

打印结果为：

2021-08-05 15:25:20.451119+0800 OCTestLine[11790:311160] name:111 2021-08-05 15:25:20.451173+0800 OCTestLine[11790:311160] name:111 2021-08-05 15:25:20.451212+0800 OCTestLine[11790:311160] name:333 2021-08-05 15:25:20.451243+0800 OCTestLine[11790:311160] name:10 2021-08-05 15:25:20.451274+0800 OCTestLine[11790:311160] name:10 2021-08-05 15:25:20.451299+0800 OCTestLine[11790:311160] name:30 2021-08-05 15:25:20.451324+0800 OCTestLine[11790:311160] name:40 Program ended with exit code: 0