10实践项目3.1

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

int
main()

{

int
sum=0;

int
a,b,d,t;

int
i;

srand(time(0));

for(i=0;
i<10;
i++)

{

printf("第
%d 题: ", i+1);

a=rand()%10+1;

b=rand()%10+1;

d=a+b;

printf("%d＋%d＝",
a, b);

scanf("%d",
&t);

if(t==d)

{

printf("
right! \n");

sum++;

}

else

printf("
wrong! \n");

}

printf("共答对了%d道题，得分率%.2f\n",
sum, 1.0*sum/10*100);

return
0;

}