c - 尝试将随机生成的 float 存储在数组中。但无法理解为什么数组采用垃圾值

Question

随机数生成正确，但当我将其存储到数组时，有时它接受垃圾值

void main()
{
    int x = 0, y = 0, i = 0;
    srand(time(NULL));
    int r = rand();
    /*Generating Random Number in Floating Point. For calculating Dimension of Rectangle*/
    srand((unsigned int)time(NULL));

    float a = 5.0, s[20], sum = 0, x_rand;
    for (i=0; i<20; i++)
    {

        x_rand = (((float)rand()/(float)(RAND_MAX)) * a) + sum;
        sum += 1.53;
        //s[i] = x_rand;
        if(i != 0)
        {
           if(x_rand>s[i-1])
                s[i] = x_rand;
        }
        else
        {
            s[i] = x_rand;
        }
        printf("%f\n", x_rand);
    }
    printf("--------------------------\n");
    for(i =0 ; i<20; i++)
        printf("%.5f\n",s[i]);
}

Output of The Program

Answer 1

在您的代码中，如果 i 为 0，则 s[i] 保持未初始化状态。

使用更好的缩进。您的代码本质上与

相同

   if(i != 0)
   {
        if(x_rand>s[i-1])
         {
            s[i] = x_rand;
         }
         else
         {
            s[i] = x_rand;
         }
     }
     //where is else????

相关，引用 C11，第 §6.8.4.1 章

An else is associated with the lexically nearest preceding if that is allowed by the syntax.