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

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

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

int main(void){
  	int counter;
  	int maxval=0;
  	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);
}