[Solved] How to insert for loop in void function?

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result in main and result in decode are two different variables.

If you want decode to know about the result from main you should pass it as a parameter:

void decode(unsigned char* msg, int result[5])
{
    // Remove declaration of result 
    // Keep the rest of the code
}

int main()
{
  /* other code */
            decode (rxbuf, result); // calling decode funtion
  /* other code */
}

solved How to insert for loop in void function?