Mips Assembly porting from C

[kharri5]

I was curious if anyone knows how the shit I port this C code over to MIPS assembly.

first i take input from a user as a string. I want to parse the string into two chars and take those and plug em into a vaiable input: I don't know how to do that, and I don't know how to make this code below port over to MIPS assembly:

//the following is in C++

    if(input[0] == 'x')
    {
        cout<< "Exiting...";
        exit(0);
    }

    origNum1 = 0;
    origNum2 = 0;

    //for first character
    if(input[0] == 'A' || input[0] == 'B' || input[0] == 'C'
       || input[0] == 'D' || input[0] == 'E' || input[0] == 'F')
    {
        origNum1 = (int)input[0] - 55;               
    }
    else
    {
        origNum1 = (int)input[0] - 48;
    }
    //for second character
    if(input[1] == 'A' || input[1] == 'B' || input[1] == 'C'
       || input[1] == 'D' || input[1] == 'E' || input[1] == 'F')
    {
        origNum2 = (int)input[1] - 55;               
    }
    else
    {
        origNum2 = (int)input[1] - 48;
    }

If anyone could help it would be much appreciated. Thanks.