diff --git a/dana/programs/N_Queens.dana b/dana/programs/N_Queens.dana
index ac87ea7..a153f4f 100644
--- a/dana/programs/N_Queens.dana
+++ b/dana/programs/N_Queens.dana
@@ -64,10 +64,10 @@ def main
         loop:
             if col_util >= n_param :
                 break
-            if isSafe(board_param, row_param, col_util, n_param) :
+            if isSafe(board_param, row_param, col_util, n_param) = true:
                 if row_param < 20 and col_util < 20 : board_param[row_param][col_util] := true
 
-                if solveNQueensUtil(board_param, row_param + 1, n_param) :
+                if solveNQueensUtil(board_param, row_param + 1, n_param) = true:
                     return : true
                 
                 if row_param < 20 and col_util < 20 : board_param[row_param][col_util] := false
@@ -91,7 +91,7 @@ def main
                 j_snq := j_snq + 1
             i_snq := i_snq + 1
 
-        if solveNQueensUtil(board_snq, 0, n_param) :
+        if solveNQueensUtil(board_snq, 0, n_param) = true:
             skip
         else :
             writeString: "No solution exists.\n"
diff --git a/dana/programs/calculator.dana b/dana/programs/calculator.dana
index 239ce40..6e9eef4 100644
--- a/dana/programs/calculator.dana
+++ b/dana/programs/calculator.dana
@@ -59,7 +59,7 @@ def main
             if idx = len:
                 writeString: "Invalid\n"
                 continue: lines
-            elif is_digit(buf[idx]):
+            elif is_digit(buf[idx]) = true:
                 break: a_start
             idx := idx + 1
         start := idx
@@ -68,7 +68,7 @@ def main
             if idx = len:
                 p_end := idx
                 break: a_end
-            elif not is_digit(buf[idx]):
+            elif not is_digit(buf[idx]) = true:
                 p_end := idx
                 break: a_end
             idx := idx + 1
@@ -86,7 +86,7 @@ def main
             if idx = len:
                 writeString: "Invalid\n"
                 continue: lines
-            elif is_operator(buf[idx]):
+            elif is_operator(buf[idx]) = true:
                 op := buf[idx]
                 idx := idx + 1
                 break: op_detect
@@ -100,7 +100,7 @@ def main
             if idx = len:
                 writeString: "Invalid\n"
                 continue: lines
-            elif is_digit(buf[idx]):
+            elif is_digit(buf[idx]) = true:
                 break: b_start
             idx := idx + 1
         start := idx
@@ -109,7 +109,7 @@ def main
             if idx = len:
                 p_end := idx
                 break: b_end
-            elif not is_digit(buf[idx]):
+            elif not is_digit(buf[idx]) = true:
                 p_end := idx
                 break: b_end
             idx := idx + 1
diff --git a/dana/programs/sudoku.dana b/dana/programs/sudoku.dana
index c94635a..b4d3bd2 100644
--- a/dana/programs/sudoku.dana
+++ b/dana/programs/sudoku.dana
@@ -83,9 +83,9 @@ def main
         num := 1
         loop:
             if num <= 9:
-                if isSafe(b, row, col, num):
+                if isSafe(b, row, col, num) = true:
                     b[row][col] := num
-                    if solve(b):
+                    if solve(b) = true:
                         return: true
                     b[row][col] := 0   # backtrack
                 num := num + 1
@@ -107,7 +107,7 @@ def main
             i := i + 1
         else: break
 
-    if solve(board):
+    if solve(board) = true:
         printBoard: board
     else:
         writeString: "No solution\n"