1) Here we have the part that allow to introduce data in our program. For example,  if we want to introduce some data in the form in an       array in java we use the following instruction:

char str1[] = {' P','l','e','a','s','e',' ','e','n','t','e','r',' ','a','... }

       We can declare the same array using the " .asciiz" command  in assembler after the command .data. Depending of the kind of data            we are using we have the following command s to introduce data:

.float     //float values
      .word    //integers types
.byte    //byte types
.asciiz    //text data

        An example of their use are

.float  1.23, 1.34, 1.2  # array of floats
.word  1, 2, 3, 4, 5, 6 #  array of integers

.data
str1:     .asciiz " Please enter a number >= 1 : "
str2:     .asciiz "\n\n The result is:"
          

2) It is always necessary to declare where the text file starts. For that, we use the command " .text". in addition is a good idea to declare       what  section is going to be our global main. For that, we use the command ".globl [name of main]"

            .text
            .globl main
main:
---------2.a---------
Here we have  a call to a macros that allows us to print text in the terminal

            li $v0, 4                            
            la $a0, str1                       
            syscall                              
----------------------

            li $v0, 5                           
            syscall                              
            move $t1, $v0                 

            addi $t3, $zero, 1            
            slti $t2, $t1, 1                  
            beq $t3, $t2, do_nothing  


            addi $t0, $t0, 0              

---------2.b---------
Here we have a really interesting structure that  represents the classical loops in our high level languages. Different Loops will have different structures in assembler.

loop:
            sge $t2, $t1, $t3            
            beq $t2, $zero, end       

            add $t0, $t0 , $t1           
            addi $t1, $t1 , -1          
            j loop

end:
----------------------

            li $v0, 4                       
            la $a0, str2                  
            syscall                          

            li $v0, 1                       
            move $a0, $t0            
            syscall

do_nothing:

---------2.c-----------
It is always a good idea to have this instructions to finish and return after our program finishes.

           li $v0, 10
           syscall
-----------------------