diff --git a/Makefile b/Makefile
index 48606f2..6d02aae 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ else
 endif
 
 CFLAGS =
-CFLAGS += -std=c89
+CFLAGS += -std=c99
 CFLAGS += -Wshadow -Wall -Wpedantic -Wextra -Wdouble-promotion -Wunused-result
 CFLAGS += -g
 CFLAGS += -Ofast -march=native -pipe
diff --git a/test.c b/test.c
index 16423eb..6fcb16e 100644
--- a/test.c
+++ b/test.c
@@ -1,20 +1,151 @@
 #include "Tinn.h"
-#include <stdio.h>
 
-#define len(a) ((int) (sizeof(a) / sizeof(*a)))
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define toss(t, n) ((t*) malloc((n) * sizeof(t)))
+
+#define retoss(ptr, t, n) (ptr = (t*) realloc((ptr), (n) * sizeof(t)))
+
+typedef struct
+{
+    double** id;
+    double** od;
+    int icols;
+    int ocols;
+    int rows;
+}
+Data;
+
+static int lns(FILE* const file)
+{
+    int ch = EOF;
+    int lines = 0;
+    int pc = '\n';
+    while((ch = getc(file)) != EOF)
+    {
+        if(ch == '\n')
+            lines++;
+        pc = ch;
+    }
+    if(pc != '\n')
+        lines++;
+    rewind(file);
+    return lines;
+}
+
+static char* readln(FILE* const file)
+{
+    int ch = EOF;
+    int reads = 0;
+    int size = 128;
+    char* line = toss(char, size);
+    while((ch = getc(file)) != '\n' && ch != EOF)
+    {
+        line[reads++] = ch;
+        if(reads + 1 == size)
+            retoss(line, char, size *= 2);
+    }
+    line[reads] = '\0';
+    return line;
+}
+
+static double** new2d(const int rows, const int cols)
+{
+    double** row = toss(double*, rows);
+    for(int r = 0; r < rows; r++)
+        row[r] = toss(double, cols);
+    return row;
+}
+
+static Data ndata(const int icols, const int ocols, const int rows)
+{
+    const Data data = {
+        new2d(rows, icols), new2d(rows, ocols), icols, ocols, rows
+    };
+    return data;
+}
+
+static void parse(const Data data, char* line, const int row)
+{
+    const int cols = data.icols + data.ocols;
+    for(int col = 0; col < cols; col++)
+    {
+        const float val = atof(strtok(col == 0 ? line : NULL, " "));
+        if(col < data.icols)
+            data.id[row][col] = val;
+        else
+            data.od[row][col - data.icols] = val;
+    }
+}
+
+static void dfree(const Data d)
+{
+    for(int row = 0; row < d.rows; row++)
+    {
+        free(d.id[row]);
+        free(d.od[row]);
+    }
+    free(d.id);
+    free(d.od);
+}
+
+static void shuffle(const Data d)
+{
+    for(int a = 0; a < d.rows; a++)
+    {
+        const int b = rand() % d.rows;
+        double* ot = d.od[a];
+        double* it = d.id[a];
+        // Swap output.
+        d.od[a] = d.od[b];
+        d.od[b] = ot;
+        // Swap input.
+        d.id[a] = d.id[b];
+        d.id[b] = it;
+    }
+}
+
+static Data build(const char* path, const int icols, const int ocols)
+{
+    FILE* file = fopen(path, "r");
+    if(file == NULL)
+    {
+        printf("Could not open %s\n", path);
+        printf("Get the training data: \n");
+        exit(1);
+    }
+    const int rows = lns(file);
+    Data data = ndata(icols, ocols, rows);
+    for(int row = 0; row < rows; row++)
+    {
+        char* line = readln(file);
+        parse(data, line, row);
+        free(line);
+    }
+    fclose(file);
+    return data;
+}
 
 int main(void)
 {
-    double in[] = { 0.05, 0.10 };
-    double tg[] = { 0.01, 0.99 };
-    /* Two hidden nuerons */
-    const Tinn tinn = xtbuild(len(in), 2, len(tg));
-    int i;
-    for(i = 0; i < 10000; i++)
+    const Data data = build("semeion.data", 256, 10);
+    shuffle(data);
+    const Tinn tinn = xtbuild(data.icols, 64, data.ocols);
+    for(int i = 0; i < 10000; i++)
     {
-        double error = xttrain(tinn, in, tg, 0.5);
+        double error = 0.0;
+        for(int j = 0; j < data.rows; j++)
+        {
+            double* in = data.id[j];
+            double* tg = data.od[j];
+            //error += xttrain(tinn, in, tg, 0.5);
+        }
         printf("%.12f\n", error);
     }
     xtfree(tinn);
+    dfree(data);
     return 0;
 }