don't depend on math.h's POW by using a bitshift instead:

2 files changed, 2 insertions, 3 deletions

diff --git a/kmer_frequency_per_sequence.c b/kmer_frequency_per_sequence.c
index 02a221b..62b98cb 100644
--- a/kmer_frequency_per_sequence.c
+++ b/kmer_frequency_per_sequence.c
@@ -27,7 +27,6 @@ int main(int argc, char **argv) {
   long kmer = 6;
   size_t len = 0;
   ssize_t read;
-  unsigned long width = 0;
 
   if(argc != 3) {
     printf("Please supply a filename and a kmer\n");
@@ -40,7 +39,7 @@ int main(int argc, char **argv) {
     exit(EXIT_FAILURE);
   }
 
-  width = (int)pow(4, kmer);
+	const unsigned long width = (unsigned long)1 << (kmer * 2);
 
   while ((read = getline(&line, &len, fh)) != -1) {
     if(line[0] != '>' && (read > kmer)) {
diff --git a/kmer_total_count.c b/kmer_total_count.c
index 113c979..345bceb 100644
--- a/kmer_total_count.c
+++ b/kmer_total_count.c
@@ -43,7 +43,7 @@ int main(int argc, char **argv) {
   const unsigned int kmer = atoi(argv[2]);
 
   // width is 4^kmer 
-  const unsigned long width = pow(4, kmer);
+	const unsigned long width = (unsigned long)1 << (kmer * 2);
 
   // malloc our counts matrix
   unsigned long long * const counts = malloc((width+ 1) * sizeof(unsigned long long));