batch script works with C prog

exercises/batch_job.sh

 #!/bin/bash
-#SBATCH --mem=150
 
-srun ./hpc_example.py -t 40 -l 2000
-
-srun --mem=3000 ./hpc_example.py -t 30 -l 80000000
+srun ./hpc_example -t 30 -m 200