How does this encryption works?

Actually i am confused.. what does the following code does ??
what is ^ and %... What is control flow of the source code?
Please explain line by line.

Code:

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void encryptDecrypt(uint8_t *input, uint64_t size) {
    uint8_t key[] = {'A', 'B', 'C'}; //Can be any chars, and any size array
   
    for(int i = 0; i < size; i++) {
        input[i] = input[i] ^ key[i % (sizeof(key)/sizeof(uint8_t))];
    }
}

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Thanks

A simple Google will answer this question.
Operators in C

Quote:

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Originally Posted by G4143

A simple Google will answer this question.
Operators in C

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Could you please explain the source code in details?
Each line by line the control flow!

Here's a link(again Google'ing xor encryption)...
XOR Encryption Algorithm - 101 Computing