bash program called producer and a C program called consumer.c

/*
Description:	Subtract 3 from the integer stored in storage,
				write new number into storage
				execute bash file "producer.sh"	

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>

int main(){
	FILE *fd;
        fd = fopen("storage","rw+" );   // Open file allowing read and write 
      	char buf[2];
	int sub, pid;
	fscanf(fd, "%s",buf);    // reads storage, and store value into buf
	int num = atoi(buf);	// convert to int
	sub = num - 3;      // take value in buf and subtract by 3
	printf("from consumer: current total is %d\n",sub);
	fseek(fd, 0, SEEK_SET);	// set file pointer to beginning
        fprintf(fd,"%d",sub);   // write new value into storage
	pid = fork();
	if(pid == 0){
        	execlp("./producer.sh", "producer", NULL);   // execute producer.sh
	}
	fclose(fd);
	return 0;
}

producer

#!/bin/bash
#Description:	Add 8 from integer that is stored in storage					 			
#				write new number into storage, 	   						   			
#				execute C program "consumer.c"	     	 

val=$(< storage)   #store value in storage into val
max=100
	# if val is less then max
	if [ $val -lt $max ]
	then
		let num=$val+8   # calculate value + 8
		
		# check to see if $val + 8 > 100
		if [ $num -ge $max ]
		then
			echo "from producer: Now I will take the rest!" 
			exit  # exit the whole program if over 100
		fi
		
		echo "from producer: current total is $num"	
		echo $num > storage    # overwrite storage with new value 
		./consumer      # execute consumer.c
	
	# if over value in storage is > 100 end program
	else 
		echo "from producer: Now I will take the rest!" 
	fi