Update hw3.c

hw3.c

@@ -1,19 +1,26 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-void allocate_memory(double ** buf, long N)
+int allocate_memory(double ** buf, long N)   /* Returns a 0 on success, 1 on failed */
 {
    if (N>1000000)
      {
         printf("Tried to hog up too much memory!\n");
-        exit(0);
      }
-   * buf=(double *)malloc(N*sizeof(double));   
+   else
+   {
+     * buf=(double *)malloc(N*sizeof(double));   
    if (*buf==NULL)
      {  
         printf("Allocation failed\n");
-        exit(0);
      }
+      else
+      {
+      return 0;  /* Only returned for N<=1000000 and *buf != NULL */
+      }
+      return 1;   /* Defaults to returning a failed 1 for N>1000000 or Allocation failed - could later distinguish these! */
+   }
+
 }
 void gen_random_numbers(double *buf,long N)
 {
@@ -41,10 +48,12 @@ int main(int argc, char *argv[])
         exit(0);
      }
    N=atoi(argv[1]);
-   allocate_memory(&buffer, N);
+   if (allocate_memory(&buffer, N) == 0)     /* Updated code here so that following steps only run on successful allocation */
+   {
    gen_random_numbers(buffer,N);
    average=compute_average(buffer,N);
    printf("The average we have been waiting on is %f\n",average);
+   }
    return(0);
 }