学步园

/*<br /> * 2-4.c<br /> *<br /> * Created on: 2010-12-30<br /> * Author: jinyong<br /> * 块数据I/O操作<br /> */<br /> #include <stdio.h><br /> #include <string.h><br /> #define number 3<br /> struct test<br /> {<br /> char name[20];<br /> int pay;<br /> }s[number];<br /> int main(void)<br /> {<br /> FILE *fp;<br /> strcpy(s[0].name,"张三");<br /> s[0].pay = 200;<br /> strcpy(s[1].name,"李四");<br /> s[1].pay = 500;<br /> strcpy(s[2].name,"王五");<br /> s[2].pay = 12345;<br /> fp = fopen("test-3","a+");<br /> fwrite(s, sizeof(struct test), number, fp);<br /> /**<br /> * size_t fwrite(const void *ptr, size_t size, size_t number, FILE *stream);<br /> * 将数据写入文件流<br /> * ptr:欲写入的数据首地址<br /> * size:字符串长度<br /> * number:字符串数目<br /> * stream:一个文件流<br /> * 成功返回写入的number数目<br /> * 失败返回EOF<br /> */<br /> fclose(fp);<br /> return 0;<br /> }<br />  

/*<br /> * 2-5.c<br /> *<br /> * Created on: 2010-12-30<br /> * Author: jinyong<br /> */<br /> #include <stdio.h><br /> #define number 3<br /> struct test<br /> {<br /> char name[20];<br /> int pay;<br /> }s[number];<br /> int main(void)<br /> {<br /> FILE *fp;<br /> int i;<br /> fp = fopen("test-3","r");<br /> fread(s, sizeof(struct test), number, fp);<br /> /**<br /> * size_t fread(void *ptr, size_t size, size_t number,FILE *stream)<br /> * ptr 欲写入的数据地址(将读到的数据写入到ptr地址)<br /> * size 字符串长度<br /> * number 块数目<br /> * stream 文件流<br /> * 成功返回读取到的number数目<br /> * 失败返回EOF<br /> */<br /> fclose(fp);<br /> for(i=0;i<number;i++)<br /> printf("帐号[%d]:%-20s 余额[%d]:%d/n", i, s[i].name, i, s[i].pay);<br /> return 0;<br /> }<br />