Improve code

C/p051.c

@@ -30,7 +30,11 @@ int main(int argc, char **argv)
    clock_gettime(CLOCK_MONOTONIC, &start);
 
    /* N set to 1000000 as a reasonable limit, which turns out to be enough.*/
-   primes = sieve(N);
+   if((primes = sieve(N)) == NULL)
+   {
+      fprintf(stderr, "Error! Sieve function returned NULL\n");
+      return 1;
+   }
 
    /* Checking only odd numbers with at least 4 digits.*/
    for(i = 1001; i < N; i += 2)

C/p060.c

@@ -24,7 +24,11 @@ int main(int argc, char **argv)
 
    clock_gettime(CLOCK_MONOTONIC, &start);
 
-   primes = sieve(N);
+   if((primes = sieve(N)) == NULL)
+   {
+      fprintf(stderr, "Error! Sieve function returned NULL\n");
+      return 1;
+   }
 
    /* Straightforward brute force approach.*/
    for(p1 = 3; p1 < N && !found; p1 += 2)

Python/p003.py

@@ -26,7 +26,7 @@ def max_prime_factor(num):
 
 #       If num is divisible by i and i is prime, find largest
 #       prime factor of num/i.
-        while 1:
+        while True:
             if num % i == 0:
                 if is_prime(i):
                     return max_prime_factor(num//i)

Python/p038.py

@@ -33,7 +33,7 @@ def main():
         n = 0
         j = 1
 
-        while 1:
+        while True:
             tmp = i * j
             n = n + tmp
             j = j + 1

Python/p041.py

@@ -8,15 +8,6 @@
 from timeit import default_timer
 from projecteuler import is_pandigital, is_prime
 
-def count_digits(n):
-    i = 0
-
-    while n > 0:
-        i = i + 1
-        n = n // 10
-
-    return i
-
 def main():
     start = default_timer()
 
@@ -28,7 +19,7 @@ def main():
     i = 7654321
 
     while(i > 0):
-        if is_pandigital(i, count_digits(i)) and is_prime(i):
+        if is_pandigital(i, len(str(i))) and is_prime(i):
             break
 #       Skipping the even numbers.
         i = i - 2

Python/p052.py

@@ -35,7 +35,7 @@ def main():
     i = 1
 
 #   Brute force approach, try every integer number until the desired one is found.
-    while 1:
+    while True:
         if have_same_digits(i, 2*i) and have_same_digits(i, 3*i) and have_same_digits(i, 4*i) and\
                 have_same_digits(i, 5*i) and have_same_digits(i, 6*i):
                     break

Python/p057.py

@@ -18,15 +18,6 @@
 
 from timeit import default_timer
 
-def count_digits(n):
-    count = 0
-
-    while n > 0:
-        n = n // 10
-        count = count + 1
-
-    return count
-
 def main():
     start = default_timer()
 
@@ -41,7 +32,7 @@ def main():
         d = n + d
         n = n +  d2
 
-        if count_digits(n) > count_digits(d):
+        if len(str(n)) > len(str(d)):
             count = count + 1
 
     end = default_timer()

Python/p058.py

@@ -33,7 +33,7 @@ def main():
     count = 0
     diag = 5
 
-    while 1:
+    while True:
         i = i + step
 
         if is_prime(i):