编写一个程序能生成16g的随机双精度浮点数以十六进制存储，并将这些数降序排列存到文件b,最后将前一百个数存到文件c

这个问题可以回答。以下是程序的代码：

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

#define NUM_FLOATS 400000000 // 16GB / 8 bytes per double

int main() {
double* floats = malloc(NUM_FLOATS * sizeof(double));
if (floats == NULL) {
printf("Error: could not allocate memory for floats.\n");
return 1;
}

// Generate random doubles
srand(time(NULL));
for (int i = ; i < NUM_FLOATS; i++) {
floats[i] = ((double)rand() / RAND_MAX) * 1e10;
}

// Sort in descending order
qsort(floats, NUM_FLOATS, sizeof(double), compare_doubles);

// Write to file b
FILE* file_b = fopen("b", "wb");
if (file_b == NULL) {
printf("Error: could not open file b for writing.\n");
return 1;
}
fwrite(floats, sizeof(double), NUM_FLOATS, file_b);
fclose(file_b);

// Write first 100 doubles to file c
FILE* file_c = fopen("c", "wb");
if (file_c == NULL) {
printf("Error: could not open file c for writing.\n");
return 1;
}
fwrite(floats, sizeof(double), 100, file_c);
fclose(file_c);

free(floats);
return ;
}

int compare_doubles(const void* a, const void* b) {
double diff = *(double*)b - *(double*)a;
if (diff > ) {
return 1;
} else if (diff < ) {
return -1;
} else {
return ;
}
}