C language file cursor fseek

// Write file by block 
struct Hero
{
char name[64]; // full name 
int age; // Age 
};
void test02()
{
FILE* fp = NULL;
fp = fopen("fseek.txt", "w");
if (fp == NULL)
{
printf(" File opening failure \n");
return;
}
struct Hero heros[4] = {
{ " The Monkey King ", 33 },
{ " Han xin ", 28 },
{ " zhaoyun ", 45 },
{ " Arthur ", 35 }
};
for (int i = 0; i < 4; i++)
{
// Parameters 1  First address of data   Parameters 2  Block size   Parameters 3  Number of pieces   Parameters 4  The file pointer 
fwrite(&heros[i], sizeof(struct Hero), 1, fp);
}
// Close file 
fclose(fp);
//fseek function   Perform random position reading 
FILE* fp2 = NULL;
fp2 = fopen("fseek.txt", "r");
if (fp2 == NULL)
{
printf(" File opening failure \n");
return;
}