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#include<stdio.h>
#include<time.h>
#include<stdlib.h>
int main(){
int choice;
printf("欢迎使用学生考试系统\n");
char name[100];
char xuehao[110];
//设置两个储存姓名和学号的字符串数组
printf("请选择系统功能选项1登入 0退出\n") ;
//模拟正式考试系统时的考试界面
scanf("%d",&choice);
switch(choice)
{
case 1:printf("请输入你的姓名、学号\n");
scanf("%s",name);
scanf("%s",xuehao);
//使用字符串数组输入姓名和学号
int a,b,c,i,j,score[10],trueValue,sum=0;
srand(time(NULL));
for( i=0;i<10;i++){
for(a=rand()%51,b=rand()%51;a+b>50 || a+b<0 || a-b>50 || a-b<0; a=rand()%51,b=rand()%51)
c=rand()%2;
//使用rang函数随机生成[050]以内的数字
//c随机生成0和1分别对应加法和减法
for( j=0;j<3;j++){
if(c==1){
printf("%d:%d+%d=",i+1,a,b);
trueValue=a+b;
//加法公式
scanf("%d",&score[i]);
if(score[i]!=trueValue){
printf("答案错误,请重新输入.\n");
score[i]=0;
}
else{
if(j==0){
score[i]=10;
}
else if(j==1){
score[i]=7;
}
else{
score[i]=5;
}
break;
}
}
//加法的计分方式
else{
printf("%d:%d-%d=",i+1,a,b);
trueValue=a-b;
//减法的公式
scanf("%d",&score[i]);
if(score[i]!=trueValue){
printf("答案错误,请重新输入.\n");
score[i]=0;
}
else{
if(j==0){
score[i]=10;
}
else if(j==1){
score[i]=7;
}
else{
score[i]=5;
}
break;
}
}
}
if(score[i]==0){
printf("正确答案是:%d\n",trueValue);
}
//减法的计分方式
sum=sum+score[i];
}
printf("你的成绩是:%d\n",sum);
if(sum>90){
printf("SMART.\n");
}
else if(sum>=80){
printf("GOOD.\n");
}
else if(sum>=70){
printf("OK.\n");
}
else if(sum>=60){
printf("PASS.\n");
}
else{
printf("TRYAGAIN\n");
}
break;
case 0:break;}
return 0;
}