Implemented read/write

Tested the implementation, it seemed to work.
windschaser · Jul 13, 2015 · 125cc42 · 125cc42
1 parent 5c5868b
commit 125cc42
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Showing 4 changed files with 61 additions and 6 deletions.
diff --git a/Driver2/Module3.zip b/Driver2/Module3.zip
diff --git a/Driver2/input.txt b/Driver2/input.txt
@@ -1,7 +1,8 @@
 var a, b;
 begin
-   a := 1;
-   b := 2;
-   if a > 2 then
-      b := a;
+   read a;
+   b := a + 1;
+   if a >= 2 then
+      b := b - a;
+   write b;
 end.                                    
diff --git a/Driver2/parserwithcodegen.c b/Driver2/parserwithcodegen.c
@@ -436,6 +436,60 @@ void STATEMENT()
         printToFile(7,0,jumpBackLine);
         lines++;
     }
+    else if(TOKEN == readsym)
+    {
+        GETTOKEN();
+        if(TOKEN != identsym)
+        {
+            ERROR("Error number 28, identifier expected after read.");
+        }
+
+        symbol current = getSymbol(IDENTIFIER);
+
+        if(current.kind != 2)
+        {
+            ERROR("Error number 29, writing to a constant or procedure is not allowed.");
+        }
+
+        //SIO 0 1
+        //STO 0 M
+        printToFile(9, 0, 1);
+        printToFile(4,current.level,current.addr);
+        lines += 2;
+
+        GETTOKEN();
+    }
+    else if(TOKEN == writesym)
+    {
+        GETTOKEN();
+        if(TOKEN != identsym)
+        {
+            ERROR("Error number 30, identifier expected after write.");
+        }
+
+        symbol current = getSymbol(IDENTIFIER);
+
+        if(current.kind == 3)
+        {
+            ERROR("Error number 31, cannot write a procedure.");
+        }
+
+        if(current.kind == 2)
+        {
+            //LOD L M
+            printToFile(3, current.level, current.addr);
+        }
+        if(current.kind == 1)
+        {
+            //LIT 0 val
+            printToFile(1, 0, current.val);
+        }
+        //SIO 0 0
+        printToFile(9, 0, 0);
+        lines +=2;
+
+        GETTOKEN();
+    }
 }
 
 void BLOCK()

diff --git a/Driver2/pmachine.c b/Driver2/pmachine.c
@@ -156,12 +156,12 @@ void execute(void)
       case 9:        //SIO - pop & print, read & push, halt
          if( ir->m == 0)
          {
-            printf("\n%d\n",stack[sp]);
+            printf("Output: %d\n\n",stack[sp]);
             sp--;
          }else if(ir-> m == 1)
          {
             sp++;
-            printf("\nEnter value to push to stack: ");
+            printf("Enter value to push to stack: ");
             scanf("%d",&stack[sp]);
             printf("\n");
          }else if(ir->m == 2)