init spmm output checker

test/spmm/spmm_checker.c

@@ -1,3 +1,67 @@
+/* Test program for checking if two arrays (output of alpha*A*x + beta*y) are the same
+* Check the README.md to see all details about the tests.
+*
+* Author: Luca Pepé Sciarria, Staccone Simone (Tor Vergata University)
+*/
+
+
+
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void compare_files(const char *file1, const char *file2) {
+    FILE *file_s = fopen(file1, "r");
+    FILE *file_p = fopen(file2, "r");
+
+    if (!file_s || !file_p) {
+        perror("Error opening files");
+        exit(EXIT_FAILURE);
+    }
+
+    int n_s, n_p;
+    fscanf(file_s, "%d", &n_s);
+    fscanf(file_p, "%d", &n_p); // Assuming both files have the same number of lines
+
+    if (n_s != n_p) {
+        fprintf(stderr, "Error, differnet file sizes $d, $d", n_s, n_p);
+        exit(EXIT_FAILURE);
+    }
+
+    double value_s, value_p;
+    
+
+    for (int i = 0; i < n_s; i++) {
+        fscanf(file_s, "%lf", &value_s);
+        fscanf(file_p, "%lf", &value_p);
+        
+        if (value_s != value_p) {
+            printf("Index %d: %.2lf != %.2lf\n", i, value_s, value_p);
+        }
+    }
+
+    fclose(file_s);
+    fclose(file_p);
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <partial_filename>\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    char file_s[256], file_p[256];
+    snprintf(file_s, sizeof(file_s), "%s_serial.txt", argv[1]);
+    snprintf(file_p, sizeof(file_p), "%s_parallel.txt", argv[1]);
+
+    compare_files(file_s, file_p);
+
+    return EXIT_SUCCESS;
+}
+
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>