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;

}