diff --git a/exercise1/wave_1d.c b/exercise1/wave_1d.c
index eafdb8e..e957ab8 100644
--- a/exercise1/wave_1d.c
+++ b/exercise1/wave_1d.c
@@ -1,10 +1,9 @@
 #define _XOPEN_SOURCE 600
+#include <math.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <stdint.h>
-#include <math.h>
-
 
 // Option to change numerical precision.
 typedef int64_t int_t;
@@ -18,8 +17,8 @@ const int_t
 
 // Wave equation parameters, time step is derived from the space step.
 const real_t
-    c  = 1.0,
-    dx  = 1.0;
+    c = 1.0,
+    dx = 1.0;
 real_t
     dt;
 
@@ -27,82 +26,68 @@ real_t
 real_t
     *buffers[3] = { NULL, NULL, NULL };
 
-
-#define U_prv(i) buffers[0][(i)+1]
-#define U(i)     buffers[1][(i)+1]
-#define U_nxt(i) buffers[2][(i)+1]
-
+#define U_prv(i) buffers[0][(i) + 1]
+#define U(i) buffers[1][(i) + 1]
+#define U_nxt(i) buffers[2][(i) + 1]
 
 // Save the present time step in a numbered file under 'data/'.
-void domain_save ( int_t step )
-{
-    char filename[256];
-    sprintf ( filename, "data/%.5ld.dat", step );
-    FILE *out = fopen ( filename, "wb" );
-    fwrite ( &U(0), sizeof(real_t), N, out );
-    fclose ( out );
+void domain_save(int_t step) {
+  char filename[256];
+  sprintf(filename, "data/%.5ld.dat", step);
+  FILE *out = fopen(filename, "wb");
+  fwrite(&U(0), sizeof(real_t), N, out);
+  fclose(out);
 }
 
-
 // TASK: T1
 // Set up our three buffers, fill two with an initial cosine wave,
 // and set the time step.
-void domain_initialize ( void )
-{
-// BEGIN: T1
-    ;
-// END: T1
+void domain_initialize(void) {
+  // BEGIN: T1
+  ;
+  // END: T1
 }
 
-
 // TASK T2:
 // Return the memory to the OS.
 // BEGIN: T2
-void domain_finalize ( void )
-{
-    ;
+void domain_finalize(void) {
+  ;
 }
 // END: T2
 
-
 // TASK: T3
 // Rotate the time step buffers.
 // BEGIN: T3
-    ;
+;
 // END: T3
 
-
 // TASK: T4
 // Derive step t+1 from steps t and t-1.
 // BEGIN: T4
-    ;
+;
 // END: T4
 
-
 // TASK: T5
 // Neumann (reflective) boundary condition.
 // BEGIN: T5
-    ;
+;
 // END: T5
 
-
 // TASK: T6
 // Main time integration.
-void simulate( void )
-{
-// BEGIN: T6
-    int_t iteration=0;
-    domain_save ( iteration / snapshot_freq );
-// END: T6
+void simulate(void) {
+  // BEGIN: T6
+  int_t iteration = 0;
+  domain_save(iteration / snapshot_freq);
+  // END: T6
 }
 
+int main(void) {
+  domain_initialize();
 
-int main ( void )
-{
-    domain_initialize();
+  simulate();
 
-    simulate();
-
-    domain_finalize();
-    exit ( EXIT_SUCCESS );
+  domain_finalize();
+  exit(EXIT_SUCCESS);
 }