//fread/fwrite文件操作

[c++]代码库

#include <stdio.h>
//fread/fwrite(内存地址，每个元素字节数，元素个数，文件)
typedef struct person{
	char name[20];//20b
	char gender;//1b
	int age;//4b+空3b
	double salary;//8b
}person;//共36bytes
int main()
{
	person a[5]={{"郭益如",'F',18,3500},{"王龙",'M',20,4500},
	{"高上",'M',21,4000},{"张永香",'F',19,3600},{"刘剑",'M',24,6000}};
	FILE* fp = fopen("person.dat", "wb");
	if(fp==NULL){
		printf("打开person.dat文件失败\n");
		return 1;
	}
	int b[10]={11,22,33,44,55,66,77,88,99,1010};
	short s=12345;
	fwrite(a, sizeof(person), 5, fp);
	fwrite(b, sizeof(int), 10, fp);
	fwrite(&s, sizeof(short), 1, fp);
	fclose(fp);
	return 0;
}