Summary of swap problems in C Language

# Include <stdlib. h>
# Include <stdio. h>

Void swap1 (int x, int y)

{

Int temp;

Temp = x;

X = y;

Y = temp;

}

Void swap2 (int * x, int * y)

{

Int * temp;

Temp = x;

X = y;

Y = temp;

}

Void swap3 (int * x, int * y)

{

Int temp;

Temp = * x;

* X = * y;

* Y = temp;

}

Void swid (int a [], int B [])

{

Int temp;

Temp = a [0];

A [0] = B [0];

B [0] = temp;

}

Void swap5 (int a [], int B [])

{

Int temp;

Temp = *;

* A = * B;

* B = temp;

}

Int main ()

{

Int x, y;

X = 4;

Y = 3;

Swap1 (x, y );

Printf ("swap1: x: % d, y: % d \ n", x, y); // The parameter value cannot be exchanged, in the past, it was a copy without changing x, y in the main function.

Swap2 (& x, & y );

Printf ("swap2: x: % d, y: % d \ n", x, y); // cannot be exchanged. The function only switches the address, the content pointed to by the address is not exchanged

Swap3 (& x, & y );

Printf ("swap3: x: % d, y: % d \ n", x, y); // You can exchange the content pointed to by the address.

Swap4 (& x, & y );

Printf ("swap4: x: % d, y: % d \ n", x, y); // exchange the content pointed to by the address

Swap5 (& x, & y );

Printf ("swap5: x: % d, y: % d \ n", x, y); // exchange the content pointed to by the address

Return 0;

}

Swap1: x: 4, y: 3

Swap2: x: 4, y: 3

Swap3: x: 3, y: 4

Swap4: x: 4, y: 3

Swap5: x: 3, y: 4

 

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