for loop

examples/euler1.zr

@@ -1,9 +1,7 @@
 func main[] : I64
     let sum: I64 = 0
 
-    let i: I64 = 0
-    while i < 1000
+    for i in 0:1000
         if i % 5 == 0 || i % 3 == 0
             sum = sum + i
-        i = i + 1
     print_i64(sum)

examples/euler10.zr

@@ -1,9 +1,7 @@
 func main[] : I64
     let sum: I64 = 0
 
-    let i: I64 = 0
-    while i < 2000000
+    for i in 0:2000000
         if Math.is_prime(i)
             sum = sum + i
-        i = i + 1
     print_i64(sum)

examples/euler12.zr

@@ -2,11 +2,9 @@ func num_divisors[n: I64] : I64
     let end: I64 = isqrt(n)
 
     let result: I64 = 0
-    let i: I64 = 1
-    while i < end + 1
+    for i in 1:end+1
         if n % i == 0
             result = result + 2
-        i = i + 1
 
     if end * end == n
         result = result - 1

examples/euler14.zr

@@ -14,11 +14,9 @@ func main[] : I64
     let max: I64 = 0
     let max_index: I64 = 0
 
-    let i: I64 = 1
-    while i < 1000000
+    for i in 1:1000000
         let seq: I64 = collatz_seq(i)
         if seq > max
             max = seq
             max_index = i
-        i = i + 1
     print_i64(max_index)

examples/euler15.zr

@@ -3,9 +3,7 @@ func main[] : I64
     let r: I64 = 20
     let out: I64 = 1
 
-    let i: I64 = 1
-    while i < r + 1
+    for i in 1:r+1
         out = out * (n - (r - i)) / i
-        i = i + 1
 
     print_i64(out)

examples/euler4.zr

@@ -1,15 +1,13 @@
 func main[] : I64
     let out: I64 = 0
 
-    let a: I64 = 500
-    while a < 1000
-        let b: I64 = 500
-        while b < 1000
+    for a in 500:1000
+        for b in 500:1000
             if a * b > out
                 let s: String = I64.to_string(a * b)
                 let s_rev: String = strrev(s)
                 if strcmp(s, s_rev) == 0
                     out = a * b
-            b = b + 1
-        a = a + 1
+                free(s)
+                free(s_rev)
     print_i64(out)

examples/euler5.zr

@@ -1,8 +1,6 @@
 func main[] : I64
     let out: I64 = 1
 
-    let i: I64 = 1
-    while i < 21
+    for i in 1:21
         out = Math.lcm(out, i)
-        i = i + 1
     print_i64(out)

examples/euler6.zr

@@ -1,15 +1,11 @@
 func main[] : I64
     let sum_of_squares: I64 = 0
-    let i: I64 = 1
-    while i < 101
+    for i in 1:101
         sum_of_squares = sum_of_squares + i * i
-        i = i + 1
 
     let square_of_sum: I64 = 0
-    i = 1
-    while i < 101
+    for i in 1:101
         square_of_sum = square_of_sum + i
-        i = i + 1
     square_of_sum = square_of_sum * square_of_sum
 
     print_i64(square_of_sum - sum_of_squares)

examples/euler8.zr

@@ -2,9 +2,8 @@ func main[] : I64
     let n: String = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"
 
     let out: I64 = 0
-    let i: I64 = 0
     let max: I64 = strlen(n) - 13
-    while i < max
+    for i in 0:max
         let s: I64 = 1
         let j: I64 = 0
         while j < 13
@@ -12,5 +11,4 @@ func main[] : I64
             j = j + 1
         if s > out
             out = s
-        i = i + 1
     print_i64(out)

examples/euler9.zr

@@ -1,11 +1,7 @@
 func main[] : I64
-    let a: I64 = 1
-    while a < 1000
-        let b: I64 = 1
-        while b < 1000
+    for a in 1:1000
+        for b in 1:1000
             let c: I64 = 1000 - b - a
             if a * a + b * b == c * c
                 print_i64(a * b * c)
-                return 0
-            b = b + 1
-        a = a + 1
+                return 0