下列程序的执行结果是什么？

下列程序的执行结果是什么？

#include “stdio.h”

#include “stdlib.h”

#include “time.h”

void main()

{int a, b, answer, result,error, score, i, op;

       srand(time(NULL));

       error=0;

       score=0;

       for(i=0;i<10;i++)

       {

              a=rand()%10+1;

              b=rand()%10+1;

              op=rand()%4+1;

              switch(op)

          {

                 case 1:

                            printf(“%d+%d=”,a,b);

                            result=a+b;

                            break;

                    case 2:

                            printf(“%d-%d=”,a,b);

                            result = a – b;

                            break;

                    case 3:

                            printf(“%d * %d=”,a,b);

                            result=a*b;

                            break;

                      case 4:

                            if(b!=0)

                            {

                             printf(“%d/%d=”,a,b);

                             result=a/b;/*注意这里是整数除法运算，结果为整型*/

                             }

                             else

                                   {    printf(“Division by zero!\n”);  }

                                   break;

                    default:

                            printf(“Unknown operator!\n”);

                            break;

             }

             scanf(“%d”,&answer);

             if(result==answer)

            {printf(“Rright!\n”);      score = score + 10;}

             else

            {printf(“Not correct!\n”);      error++;}

      }

       printf(“score = %d, error numbers = %d\n”, score, error);

}

程序的执行结果是:
随机产生10道加减乘除运算，输入每道题答案，正确加十分，错误则记录错误的题数。