diff --git a/2ano/1semestre/ac1/aula03/AC1-P-Aula3.pdf b/2ano/1semestre/ac1/aula03/AC1-P-Aula3.pdf
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Binary files /dev/null and b/2ano/1semestre/ac1/aula03/AC1-P-Aula3.pdf differ
diff --git a/2ano/1semestre/ac1/aula03/ex1.asm b/2ano/1semestre/ac1/aula03/ex1.asm
new file mode 100644
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--- /dev/null
+++ b/2ano/1semestre/ac1/aula03/ex1.asm
@@ -0,0 +1,44 @@
+        .data
+str1:   .asciiz "Introduza um numero: "
+str2:   .asciiz "Valor ignorado\n"
+str3:   .asciiz "A soma dos positivos e: "
+	.eqv print_string,4
+	.eqv read_int,5
+	.eqv print_int,1
+        .text
+        .globl main
+# Mapa de registos:
+# soma: $t0
+# valor: $t1
+# i: $t2
+main:   li      $t2,0           # i=0
+        li      $t0,0           # soma=0
+for:    bge     $t2,5,endfor    # while (i<5) do {
+
+        li      $v0,print_string
+        la      $a0,str1
+        syscall                 # printf("Introduza um numero: ")
+
+        li      $v0,read_int
+        syscall                 # scanf("%d",&valor)
+        move    $t1,$v0         # valor=scanf("%d",&valor)
+
+if:     ble     $t1,0,else      # if (valor<0) then {
+        add     $t0,$t0,$t1     # soma+=valor
+	    addi    $t2,$t2,1       # i+=1
+
+        j       endif
+else:   li      $v0,print_string
+        la      $a0,str2
+        syscall                 # printf("Valor ignorado\n")
+endif:  j       for             # }
+
+endfor: li      $v0,print_string
+        la      $a0,str3
+        syscall                 # printf("A soma dos positivos e: %d\n",soma")
+        
+        li      $v0,print_int
+        move    $a0,$t0
+        syscall                 # printf("%d\n",soma)
+
+        jr      $ra             # }
diff --git a/2ano/1semestre/ac1/aula03/ex2.asm b/2ano/1semestre/ac1/aula03/ex2.asm
new file mode 100644
index 0000000..664d701
--- /dev/null
+++ b/2ano/1semestre/ac1/aula03/ex2.asm
@@ -0,0 +1,46 @@
+        .data
+str1:   .asciiz "Introduza um numero: "
+str2:   .asciiz "O numero em binario e: "
+        .eqv print_string, 4
+        .eqv read_int, 5
+        .eqv print_int, 1
+        .text
+        .globl main
+
+# Mapa de registos:
+# valor: $t0
+# bit: $t1
+# i: $t2
+
+main:	la      $a0, str1
+        li      $v0, print_string
+        syscall                             # Imprime a mensagem "Introduza um numero: "
+
+        li      $v0, read_int
+        syscall                             # Le o numero introduzido pelo utilizador
+        move    $t0, $v0                    # Guarda o numero introduzido em $t0
+
+        li      $v0, print_string
+        la      $a0, str2
+        syscall                             # Imprime a mensagem "O numero em binario e: "
+
+        li      $t2, 0                      # Inicializa o contador i a 0
+
+for:    bge     $t2, 32, endfor             # Se i >= 32, termina o ciclo
+	li	$t3,0x80000000
+        and 	$t1, $t0, $t3		    # bit = valor & 0x80000000
+
+if:     beq     $t1, 0, else                # Se bit == 0, salta para else
+        li      $a0, 1                      # Caso contrario, imprime 1
+        j       endif
+
+else:   li      $a0, 0                      # Imprime 0
+
+endif:  li      $v0, print_int
+        syscall                             # Imprime o valor de a0
+        
+        sll     $t0, $t0, 1                 # valor = valor << 1
+
+        addi    $t2,$t2,1                   # i+=1
+        j       for
+endfor: jr      $ra                         # Salta para o endereco de retorno