In this exercise, you will be asked to write an MIPS assembly program that converts strings into the number format as speciied in the table.

Write a program in MIPS assembly language to convert an ASCII number string with the conditions listed in the table above, 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 through 9. Your program should compute the integer value equivalent to this string of digits, then place the number in register $v0. If a non-digit character appears anywhere in the string, your program should stop with the value -1 in register $v0. For example, if register $a0 points to a sequence of three bytes 50_ten, 52_ten, 0_ten (the null-terminated string "24"), then when the program stops, register $v0 should contain the value 24_ten.

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a. positive and negative integer decimal strings b. positive hexadecimal integers