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

typedef struct TAG_datastruct{
  	char* string;
	int checksum;
}datastruct;

datastruct* gerinput(void);
void printmessage(datastruct* todisp);

int main(void){
  	int counter;
	int maxval=-1;
	datastruct* svalues[200];

	for(counter=0;counter<200;counter++){
  		svalues[counter]=getinput();
  		if(!svalues[counter]) break;
  		maxval=counter;
	}

	printmessage(svalues[maxval/2]);

	return 0;
}

datastruct* getinput(void){
  	char input[80];
	datastruct* instruct;
	int counter;

	printf(“Enter a string,or leave blank when done:”);
	fgets(input,79,stdin);
	input[strlen(input)-1]=0;
	if(strlen(input)==0)
  		return NULL;
	instruct=malloc(sizeof(datastruct));
	instruct->string=strdup(input);
	instruct->checksum=0;
	for(counter=0;counter<strlen(instruct->string);counter++){
  		instruct->checksum + =instruct->string[counter];
	}
	return instruct;
}

void printmessage(datastruct* todisp){
  	printf(“This structure has a checksum of %d.  Its string is:\n”,
           	todisp->checksum);
  	puts(todisp->string);
}