/* 范例：9-22 */
#include <stdio.h>
struct mystruct
{
int i;
char str[10];
};
int main(int argc,char *argv[])
{
FILE *fp1;
struct mystruct s={97,"ABCDEF"};
float a=66.14;
char b='C';
int i;
if ((fp1 = fopen(argv[1], "w")) == NULL)
{
fprintf(stderr, "Cannot open output file.\n");
return 1;
}
fwrite(&s, sizeof(s), 1, fp1); /* 将结构s写入fp1 */
fwrite(&a,sizeof(float),1,fp1); /* 将变量a写入fp1 */
fwrite(&b,sizeof(char),1,fp1); /* 将变量b写入fp1 */
fclose(fp1); /* 关闭文件 */
fp1=fopen(argv[1],"r");
s.i = 0;
s.str[0]='\0';
i=fread(&s,sizeof(s),1,fp1); /* 读取变量s */
printf("i=%d s.i=%d s.str=%s\n",i,s.i,s.str);
fread(&a,sizeof(a),1,fp1); /* 读取变量a */
printf("%5.2f\n",a);
fread(&b,sizeof(b),1,fp1); /* 读取变量b */
printf("%c\n",b);
return 0;
}
程序执行结果：
D:\TC>p9-22 out.txt
i=1 s.i=97 s.str=ABCDEF
66.14
C
