diff --git a/C/p027.c b/C/p027.c
index 2487739..bc03a5a 100644
--- a/C/p027.c
+++ b/C/p027.c
@@ -26,7 +26,6 @@
 int main(int argc, char **argv)
 {
    int a, b, n, p, count, max = 0, save_a, save_b;
-   int *primes;
    double elapsed;
    struct timespec start, end;
 
diff --git a/C/p051.c b/C/p051.c
index 72eb504..5115133 100644
--- a/C/p051.c
+++ b/C/p051.c
@@ -23,7 +23,7 @@ int *primes;
 
 int main(int argc, char **argv)
 {
-   int i, found = 0;
+   int i;
    double elapsed;
    struct timespec start, end;
 
diff --git a/C/p059.c b/C/p059.c
index e3309a2..6be47b6 100644
--- a/C/p059.c
+++ b/C/p059.c
@@ -110,7 +110,7 @@ int main(int argc, char **argv)
              * the right key was likely found.*/
             if(strstr(plain_text, "the") != NULL && strstr(plain_text, "be") != NULL &&
                   strstr(plain_text, "to") != NULL && strstr(plain_text, "of") != NULL &&
-                  strstr(plain_text, "and") != NULL & strstr(plain_text, "in") != NULL &&
+                  strstr(plain_text, "and") != NULL && strstr(plain_text, "in") != NULL &&
                   strstr(plain_text, "that") != NULL && strstr(plain_text, "have") != NULL)
             {
                sum = 0;
@@ -122,7 +122,7 @@ int main(int argc, char **argv)
                }
 
                found = 1;
-               printf("%c%c%c\n", c1, c2, c3);
+//               printf("%c%c%c\n", c1, c2, c3);
             }
          }
       }
diff --git a/C/p076.c b/C/p076.c
index cb9e18f..664111d 100644
--- a/C/p076.c
+++ b/C/p076.c
@@ -16,7 +16,7 @@
 
 int main(int argc, char **argv)
 {
-	int i, n;
+	int n;
    long int *partitions;
 	double elapsed;
 	struct timespec start, end;
diff --git a/C/p206.c b/C/p206.c
index 6cccf8c..47e6360 100644
--- a/C/p206.c
+++ b/C/p206.c
@@ -52,7 +52,7 @@ int main(int argc, char **argv)
    elapsed = (end.tv_sec - start.tv_sec) + (double)(end.tv_nsec - start.tv_nsec) / 1000000000;
 
    printf("Project Euler, Problem 206\n");
-   printf("Answer: %d\n", n);
+   printf("Answer: %ld\n", n);
 
    printf("Elapsed time: %.9lf seconds\n", elapsed);
 
diff --git a/C/projecteuler.c b/C/projecteuler.c
index acf8653..da72f6d 100644
--- a/C/projecteuler.c
+++ b/C/projecteuler.c
@@ -316,7 +316,7 @@ void insertion_sort(void **array, int l, int r, int (*cmp)(void *lv, void *rv))
 int partition(void **array, int l, int r, int (*cmp)(void *lv, void *rv))
 {
    int i = l -1, j = r;
-   void *pivot, *tmp;
+   void *pivot;
   
    /* Arbitrarily selecting the rightmost element as pivot.*/ 
    pivot = array[r];