Added crude feature to pass device ID as second command line argument (using...

Added crude feature to pass device ID as second command line argument (using lots of redundant code)

example/main.cpp

@@ -369,31 +369,39 @@ int main (int argc, char * const argv[]) {
     } 
      
     device_id = NULL; 
+    unsigned int i = 0;
 
-    unsigned int i; 
-    for(i = 0; i < num_devices; i++) 
-    { 
+    if (argc == 3) {
         cl_bool available; 
-        err = clGetDeviceInfo(device_ids[i], CL_DEVICE_AVAILABLE, sizeof(cl_bool), &available, NULL); 
+        err = clGetDeviceInfo(device_ids[atoi(argv[2])], CL_DEVICE_AVAILABLE, sizeof(cl_bool), &available, NULL); 
         if(err) 
         { 
-             printf("ERROR: Cannot check device availability of device # %d\n", i); 
+            printf("ERROR: Cannot check device availability of device # %d\n", atoi(argv[2])); 
         } 
 
         if(available)
         {
-            device_id = device_ids[i]; 
-            char name[200]; 
-            err = clGetDeviceInfo(device_ids[i], CL_DEVICE_NAME, sizeof(name), name, NULL); 
-            if(err == CL_SUCCESS) 
-            { 
-                 printf("INFO: Using device %s...\n", name); 
+            device_id = device_ids[atoi(argv[2])];
         }
         else
         { 
-                 printf("INFO: Using device # %d...\n", i); 
+            printf("INFO: Device # %d not available for compute\n", atoi(argv[2])); 
+            return -1;
+        } 
+    }
+    else { 
+        for(i = 0; i < num_devices; i++) 
+        { 
+            cl_bool available; 
+            err = clGetDeviceInfo(device_ids[i], CL_DEVICE_AVAILABLE, sizeof(cl_bool), &available, NULL); 
+            if(err) 
+            { 
+                printf("ERROR: Cannot check device availability of device # %d\n", i); 
             } 
          
+            if(available) 
+            { 
+                device_id = device_ids[i]; 
                 break; 
             } 
             else 
@@ -417,6 +425,18 @@ int main (int argc, char * const argv[]) {
             //test_finish(); 
             return -1; 
         }
+    } 
+
+    char name[200]; 
+    err = clGetDeviceInfo(device_id, CL_DEVICE_NAME, sizeof(name), name, NULL); 
+    if(err == CL_SUCCESS) 
+    { 
+        printf("INFO: Using device %s...\n", name); 
+    } 
+    else 
+    { 
+        printf("INFO: Using device # %d...\n", i); 
+    } 
  
     context = clCreateContext(0, 1, &device_id, NULL, NULL, &err); 
     if(!context || err)  
@@ -458,7 +478,7 @@ int main (int argc, char * const argv[]) {
         return -1; 
     } 
      
-    if(argc == 2) { // arguments are supplied in a file with arguments for a single run are all on the same line 
+    if(argc >= 2) { // arguments are supplied in a file with arguments for a single run are all on the same line 
         paramFile = fopen(argv[1], "r"); 
         if(!paramFile) { 
             log_error((char*)"Cannot open the parameter file\n");