c - 在数组中设置随机数

Question

我是一名初学者，刚刚开始学习，因此我将不胜感激任何信息和指导。

我想生成一个长度为 15 的数组，其中包含 0 到 10 之间的随机数。我想提示用户输入该范围内的数字，并打印出该数字出现的次数。然后我想打印出带有星号(*)的数组，指示该数组中该数字的每个实例

这是我正在处理的代码:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(){
    srand(time(NULL))
    int r=rand(0)%10

    int num; /*user's input*/
    int r;
    numbers[15]={r,r,r,r,r,r,r,r,r,r,r,r,r,r,r}
    printf("Input a number between 0 and 10. \n")
     for(num= ; num ; num++)
         printf("*")

    return 0;

}

Answer 1

I want to generate an array of length 15 containing random numbersbetween 0 and 10

• 创建一个大小为 15 的数组
• 使用 for 循环通过 rand() 函数填充数组。

Note :

• use rand()%9+1 to return a random number between 0 and 10 (0,10 not included ) and don't send any arguments into rand() function.

int array[15]; //array of size 15

for(int index=0; index<15; index++)
{
    array[index] = (rand()%9)+1; //randomly generates a number between 0 and 10
}

<小时/>

prompt the user for a number in that range and print out the number of times that number appears

• 您想要实现的大部分目标都可以通过使用 for 循环来实现

在这里，我们扫描用户的数字并将其存储在 number 中，并循环遍历数组以查找 number 出现的次数，每次出现时我们都会增加该值count 的初始设置为 0。

int number,count=0;
printf("enter a number between 0 and 10 : ");
scanf("%d",&number); //scanning user prompted number

for(int index=0; index<15; index++)
{
    if(array[index]==number) //checking if array element is equal to user's input
        count++; //if yes increase the count
}
printf("the number appeared %d times\n",count); //printing number of times the number appeared

<小时/>

I then want to print out the array with an asterisk(*) indicating each instance of that number in that array

for(int index=0; index<15; index++)
{
    if(array[index]==number)
        printf("* ");
    else
    printf("%d ",array[index]);
}

<小时/>

所以你的代码总共是:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void)
{
    srand(time(NULL));

    int array[15];

    //populating array with random elements between 0 and 10
    for(int index=0; index<15; index++)
    {
        array[index] = (rand()%9)+1;
    }

    int number,count=0;

    //scanning user prompted input
    printf("enter a number between 0 and 10 : ");
    scanf("%d",&number);

    //printing number of times the user entered number appeared
    for(int index=0; index<15; index++)
    {
        if(array[index]==number)
            count++;
    }
    printf("the number appeared %d times\n",count);

    // printing the array with * in place of user entered input
    for(int index=0; index<15; index++)
    {
        if(array[index]==number)
            printf("* ");
        else
        printf("%d ",array[index]);
    }

}