int exchangeValue(int *a,int *b);
- (void)viewDidLoad {
[super viewDidLoad];
pragma 值传递
int k = 100;
NSLog(@"1 %d %p",k,&k);
[self inputValue:k];
NSLog(@"3 %d %p",k,&k);
/**
* 1 100 0x7fff524b7abc
2 110 0x7fff524b7a5c
3 100 0x7fff524b7abc
*/
pragma mark 值传递
NSString *s = @"ABC";
NSLog(@"1 %@ %p",s,&s);
[self sInputValue:s];
NSLog(@"3 %@ %p",s,&s);
/**
* 1 ABC 0x7fff52c78ab0
2 BDC 0x7fff52c78a58
3 ABC 0x7fff52c78ab0
*/
pragma mark 地址传递
NSLog(@"1 %@ %p",s,&s);
[self sInputExchangeValue:&s];
NSLog(@"3 %@ %p",s,&s);
/**
* 1 ABC 0x7fff591feab0
2 LLLLLLLL 0x7fff591feaa8 // 地址传递,临时地址
3 LLLLLLLL 0x7fff591feab0
*/
pragma mark 地址传递
int a = 100;
int b = 99;
NSLog(@"1 %d %p %d %p" ,a,&a,b,&b);
exchangeValue(&a, &b);
NSLog(@"3 %d %p %d %p" ,a,&a,b,&b);
/**
1 100 0x7fff5e285aa4 99 0x7fff5e285aa0
2 99 0x7fff5e285a38 100 0x7fff5e285a30 // 地址传递,临时地址
3 99 0x7fff5e285aa4 100 0x7fff5e285aa0
*/
pragma mark ----- 地址传递 （对照前后对比地址对比准确的说是 函数指针的拷贝)
// (1)
NSMutableArray *array = [[NSMutableArray alloc] initWithObjects:@"1",@"2",@"3",@"4", nil];
NSLog(@"1 %p",&array);
[self exchangeArrayValue:array];
NSLog(@"3 %p",&array);
for (int i = 0; i < array.count; i++) {
NSLog(@"%@",[array objectAtIndex:i]);
}
/*
1 0x7fff5f82cab0
2 0x7fff5f82ca18
3 0x7fff5f82cab0
1
2
22
4
*/
// (2)
// NSArray pointArray = [[NSArray alloc] initWithObjects:@"1",@"2",@"3",@"4", nil];
// NSLog(@"1 point %p",&pointArray);
// [self exchangePointArrayValue:pointArray];
// NSLog(@"4 point %p",&pointArray);
//
// for (int i = 0; i < pointArray.count; i++) {
// NSLog(@"%@",[pointArray objectAtIndex:i]);
// }
// /
// 1 point 0x7fff5a963ab0
// 2 point 0x7fff5a9639f8
// inpoint 1
// inpoint 2
// inpoint 3
// inpoint 4
// 3 point 0x7fff5a9639f8
// in2 point 2
// in2 point 3
// in2 point rrr
// 4 point 0x7fff5a963ab0
// 1
// 2
// 3
// 4
// */
}
-(void)exchangeArrayValue:(NSMutableArray *)ary
{
NSLog(@"2 %p",&ary);
// NSMutableArray *muArray = [[NSMutableArray alloc] initWithObjects:@"ppp",@"ooo",@"lll",@"kkkk", nil];
// ary = muArray;
[ary replaceObjectAtIndex:2 withObject:@"22"];
NSMutableArray *muArray = [[NSMutableArray alloc] initWithObjects:@"ppp",@"ooo",@"lll",@"kkkk", nil];
ary = muArray;
}
-(void)exchangePointArrayValue:(NSArray *)ay
{
NSLog(@"2 point %p",&ay);
for (int i = 0; i < ay.count; i++) {
NSLog(@"inpoint %@",[ay objectAtIndex:i]);
}
NSArray *a = @[@"2",@"3",@"rrr"];
ay = a;
NSLog(@"3 point %p",&ay);
for (int i = 0; i < ay.count; i++) {
NSLog(@"in2 point %@",[ay objectAtIndex:i]);
}
}
-(int)inputValue:(int)k
{
k = k+10;
NSLog(@"2 %d %p",k,&k);
return k;
}
-(void )sInputExchangeValue:(NSString **)p
{
p = @"LLLLLLLL";
NSLog(@"2 %@ %p",p,p);
}
int exchangeValue(int *a,int *b){
int m = *b;
*b = a;
a = m;
NSLog(@"2 %d %p %d %p" ,a,&a,b,&b);
return 100;
}
-(NSString *)sInputValue:(NSString *)p
{
p = @"BDC";
NSLog(@"2 %@ %p",p,&p);
return p;
}
