void add1() { Time=time(NULL); drawTheGameBox(); int num_rand_1,num_rand_2; int n,y=3,x=26; srand(time(NULL)); for(int i=0;i<18;i++) { gotoxy(25,y+=1); num_rand_1=rand()%11; num_rand_2=rand()%11; printf("%2d+%2d=",num_rand_1,num_rand_2); scanf("%d",&n); if(n==num_rand_1+num_rand_2) { gotoxy(65,y); n++; sorce+=10; printf("答对啦！"); gotoxy(x+=1,22); printf("★"); drawTheGameBox(); }else{ gotoxy(65,y); printf("答错啦，继续加油！"); drawTheGameBox(); } }如何将上述代码中num_rand_1+num_rand_2的’+’改为从‘+’，‘-’，‘*’，‘/’这四个字符中随机抽取一个输出

你可以使用rand()函数生成一个0到3的随机整数，然后根据不同的数值输出不同的运算符。例如：

int operator_index = rand() % 4;
char operator_char;
switch(operator_index) {
    case 0:
        operator_char = '+';
        break;
    case 1:
        operator_char = '-';
        break;
    case 2:
        operator_char = '*';
        break;
    case 3:
        operator_char = '/';
        break;
}
printf("%2d %c %2d = ", num_rand_1, operator_char, num_rand_2);

这样就可以实现将运算符随机抽取一个输出。