Question

我在调用srand的语法时遇到问题，为添加问题插入随机数？尝试查找类似的程序来查看语法而没有运气。

#include<stdio.h>
#include"simpleio.h"

 int main() 
{    
   //  int seed;scanf("%d",&seed);
   //  srand((unsigned)seed);

       int decision,n,o ;
     // scanf("%d", &n);
     // srand((unsigned)n);   


    do{
       printf("1.Give me an addition problem.\n"
              "2.Give me a subtraction problem.\n"
              "3.Give me a multiplication problem.\n"
              "4.Quit\n");
       scanf("%d", & decision);
      } while (decision>5 && decision<0);

    if (decision==1) 
    {
      printf("1+1= ");
    }
    else if (decision==2) 
    {
      printf("1-2\n");   
    }
    else if (decision==3) 
    {
      printf("1*2\n");
    }
    else if(decision==4) 
    { 
       printf("\n");
    } 

return 0;
}

Answer 1

在类似的任务中，最好使用switch case：

#include <stdio.h>
#include <string.h>

main()
{
    int decision;

    do{
       printf("1.Give me an addition problem.\n"
              "2.Give me a subtraction problem.\n"
              "3.Give me a multiplication problem.\n"
              "4.Give me a division problem.\n"
              "5.Quit\n");
       scanf("%d", & decision);
      } while (decision >5 || decision <= 0); // correct your condition

    // generate two random numbers for the operation
    srand(time(NULL));
    int a = rand()%20 + 1; // random between 1 and 20
    int b = rand()%20 + 1; // random between 1 and 20

    switch(decision)
    {
        case 1: //addition
        printf("%d + %d = %d\n", a, b, a+b);
        break;

        case 2: //subtraction
        printf("%d - %d = %d\n", a, b, a-b);
        break;

        case 3: //multiplication
        printf("%d * %d = %d\n", a, b, a*b);
        break;

        case 4: //division
        printf("%d / %d = %d, and remainder = %d\n", a, b, a/b, a%b);


        default :
        break;
    }

    return;
}

我将该部门列为奖金

使用srand插入随机数

1 个答案: