[core,pr] tidy printing

src/pr.cc

@@ -52,7 +52,7 @@ pvector<ScoreT> PageRankPullGS(const Graph &g, int max_iters,
       error += fabs(scores[u] - old_score);
       outgoing_contrib[u] = scores[u] / g.out_degree(u);
     }
-    printf(" %2d    %lf\n", iter, error);
+    PrintStep(iter, error);
     if (error < epsilon)
       break;
   }

src/pr_spmv.cc

@@ -52,7 +52,7 @@ pvector<ScoreT> PageRankPull(const Graph &g, int max_iters,
       scores[u] = base_score + kDamp * incoming_total;
       error += fabs(scores[u] - old_score);
     }
-    printf(" %2d    %lf\n", iter, error);
+    PrintStep(iter, error);
     if (error < epsilon)
       break;
   }

src/util.h

@@ -34,20 +34,17 @@ void PrintStep(const std::string &s, int64_t count) {
   printf("%-14s%14" PRId64 "\n", (s + ":").c_str(), count);
 }
 
-void PrintStep(int step, double seconds, int64_t count = -1) {
-  if (count != -1)
-    printf("%5d%11" PRId64 "  %10.5lf\n", step, count, seconds);
-  else
-    printf("%5d%23.5lf\n", step, seconds);
-}
-
 void PrintStep(const std::string &s, double seconds, int64_t count = -1) {
   if (count != -1)
     printf("%5s%11" PRId64 "  %10.5lf\n", s.c_str(), count, seconds);
   else
     printf("%5s%23.5lf\n", s.c_str(), seconds);
 }
 
+void PrintStep(int step, double seconds, int64_t count = -1) {
+  PrintStep(std::to_string(step), seconds, count);
+}
+
 // Runs op and prints the time it took to execute labelled by label
 #define TIME_PRINT(label, op) {   \
   Timer t_;                       \