Why Does MIPS Show a Negative Result for Large Factorials?

[rictor]

when I try to compile the MIPS instruction in order to compute the factorial of n number? i get the following error in the console as:
Enter the factorial number: 20
factorial of given number: -2102132736
The output which I am getting as negative integer of a given factorial instead of positive integer.
The program for the given MIPS instructions is seen in the link below:
https://gist.github.com/dcalacci/3747521

 

[BvU]

Looks like a size or a formatting problem:
2102132736 is 31 bits and -2102132736 is 32 bits interpreted as a 4 byte integer (first bit a sign bit)

For 20! you need more than 62 bits

 

[rbelli1]

20! truncated to 32 bits is -2102132736. It looks like you are calculating to 64 bits then displaying 32 bits.

BoB