C#•2y ago

Function that swap two numbers

Hi i need a function that swap 2 numbers I have written code below but it seems to doesn't work. Where am I wrong?

(int, int) Swap(int first, int second)
{
    int temp = first;
    first = second;
    second = temp;
    return (first, second);
}

int a = 5;
int b = 10;

Console.WriteLine(a);
Console.WriteLine(b);
Swap(a, b);
Console.WriteLine(a);
Console.WriteLine(b);

(int, int) Swap(int first, int second)
{
    int temp = first;
    first = second;
    second = temp;
    return (first, second);
}

int a = 5;
int b = 10;

Console.WriteLine(a);
Console.WriteLine(b);
Swap(a, b);
Console.WriteLine(a);
Console.WriteLine(b);

11 Replies

TheRanger•2y ago

you never used what the method returned

Thinker•2y ago

Swap returns a new tuple, it doesn't modify a nor b a and b will always be 5 and 10 respectively.

Aaron•2y ago

I wouldn't even make a function for this

TheRanger•2y ago

yeah (b, a) = (a,b)

MODiX•2y ago

Windows10CE#8553

REPL Result: Success

int a = 3;
int b = 5;
Console.WriteLine(a);
Console.WriteLine(b);
(a, b) = (b, a);
Console.WriteLine(a);
Console.WriteLine(b);

int a = 3;
int b = 5;
Console.WriteLine(a);
Console.WriteLine(b);
(a, b) = (b, a);
Console.WriteLine(a);
Console.WriteLine(b);

Console Output

Compile: 584.628ms | Execution: 36.117ms | React with ❌ to remove this embed.

rallez•2y ago

ohh okay so i can do it that way will it also works with arrays? to swap for example 1st elemant of array with 2nd

TheRanger•2y ago

alternatively u can do this

MODiX•2y ago

TheRanger#3357

REPL Result: Success

void Swap(ref int first, ref int second)
{
    int temp = first;
    first = second;
    second = temp;
}

int a = 5;
int b = 10;

Console.WriteLine(a);
Console.WriteLine(b);
Swap(ref a, ref b);
Console.WriteLine(a);
Console.WriteLine(b);

void Swap(ref int first, ref int second)
{
    int temp = first;
    first = second;
    second = temp;
}

int a = 5;
int b = 10;

Console.WriteLine(a);
Console.WriteLine(b);
Swap(ref a, ref b);
Console.WriteLine(a);
Console.WriteLine(b);

Console Output

Compile: 548.674ms | Execution: 33.201ms | React with ❌ to remove this embed.

MODiX•2y ago

Windows10CE#8553

REPL Result: Success

int[] arr = new int[] { 3, 5 };
Console.WriteLine(arr[0]);
Console.WriteLine(arr[1]);
(arr[0], arr[1]) = (arr[1], arr[0]);
Console.WriteLine(arr[0]);
Console.WriteLine(arr[1]);

int[] arr = new int[] { 3, 5 };
Console.WriteLine(arr[0]);
Console.WriteLine(arr[1]);
(arr[0], arr[1]) = (arr[1], arr[0]);
Console.WriteLine(arr[0]);
Console.WriteLine(arr[1]);

Console Output

Compile: 612.441ms | Execution: 40.498ms | React with ❌ to remove this embed.

Aaron•2y ago

yes, it does

rallez•2y ago

okay so it's that easy great thanks you guys! ❤️

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Function that swap two numbers