5. (20 points) Write a program in MIPS assembly language to convert a positive integer decimal string to an integer. Your program should expect register $a0 to hold the address of a null-terminated string containing some combination of the digits 0 though 9. Your program should compute the integer value equivalent to this string of digits, then place the number in register $vO. If a nondigit character appears anywhere in the string, your program should stop with the value 1 in register $v0 6. (20 points) Repeat problem 5 with convert a string of hexadecimal digits to an integer