Question

roll和exp最初都是在main()中声明的大小为13的一维数组。

#include <stdio.h>
#include <math.h>
#include <time.h>
#include <stdlib.h>

typedef struct {
int roll;
int exp;
} Roll;


int  main ( void )
{
 char quit;

 printf("\n A simulation of dice rolls to determine roll frequencey:\n");

 do {

   FILE *fp;
   int input;
   int num1, num2, sum, total = 0,i;
   Roll tosses[13] = { {0, 0}, {0, 0}, {0, 1}, {0, 2}, {0, 3}, {0, 4}, {0, 5},
                       {0, 6}, {0, 5}, {0, 4}, {0, 3}, {0, 2}, {0, 1} };

// ALGORITHM 2: Prompt user for number of rolls and store input.

    printf("\n Please enter number of rolls: ");
    scanf(" %d", &input);

// ALGORITHM 3: Calculate roll frequency.

   for (i = 0; i < input ; i++)
   {

           sum=0;
           num1=1+rand()%6;
           num2=1+rand()%6;
           sum=num1+num2;
           tosses[sum].roll++;

   }

   for (i = 0; i < 13; i++)
   {
           total+=tosses[i].roll;

// ALGORITHM 4: Display results.

    printf("\n\n");
    printf(" Roll:    Expected(%%):            Session(%%):\n");

   for (i = 2; i <= 12; i++)
   {

       printf(" %2d       %9f%%        %9f%%    (%d / %d)\n", i,
       100.0*tosses[i].exp/36, 100.0*tosses[i].roll/input, tosses[i].roll, input);
   }

 fp = fopen("results.dat", "w");
 if (fp == NULL) {
 printf("I couldn't open results.dat for writing.\n");
 exit(0);

   }


      fprintf(fp,"\n Roll:    Expected(%%):            Session(%%):\n");

   for (i = 2; i <= 12; i++)

     fprintf(fp, "%2d       %9f%%        %9f%%    (%d / %d)\n", i,
     100.0*tosses[i].exp/36, 100.0*tosses[i].roll/input, tosses[i].roll, input);

// ALGORITHM 5: Prompt user to roll again or quit.

printf("\n Would you like to run simulation again? (Type: Y / N ): ");
   scanf(" %c", &quit);

} while (quit == 'y' || quit == 'Y');

return(0);

}

Answer 1

没有令人信服的理由将并行数组更改为结构，但这是一种方式：

int ROLL[13]={0};
int EXP[13] ={0,0,1,2,3,4,5,6,5,4,3,2,1};

要

struct {
     int  roll;
     int  exp;
} tosses [13] = {
    {0, 0}, {0, 0}, {0, 1}, {0, 2}, {0, 3}, {0, 4}, {0, 5},
    {0, 6}, {0, 5}, {0, 4}, {0, 3}, {0, 2}, {0, 1}
}

所以，而不是ROLL[sum]++，它将是

++tosses[sum].roll;

将我的并行数组更改为单个结构？

1 个答案: