计算机三级C问题

来源：百度知道 编辑：UC知道 时间：2024/06/04 09:36:33
函数ReadDat( )的功能是实现从文件ENG001IN中读取一篇英文文章，存入到字符串数组xx中。请编制函数encryChar( )，按给定的替代关系对数组xx中所有字符进行替代，仍存入数组xx的对应的位置上，最后调用函数WriteDat( )把结果xx输出到文件ps001.dat中。
替代关系：f(p)=p*11 mod 256（p是数组xx中某一个字符的ASCII值，f(p)是计算后新字符的ASCII值），如果原字符是小写字母或计算后f(p)的值小于等于32，则该字符不变，否则将f(p)所对应的字符进行替代。
注意：部分源程序已给出，原始数据文件的存放格式是每行的宽度均小于80个字符。
请勿改动主函数main()、读函数ReadDat()和写函数WriteDat()的内容。
试题程序：
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
unsigned char xx[50][80];
int maxline=0;
int ReadDat(void);
void WriteDat(void);

void encryChar()
{

}

void main()
{
system("CLS");
if(ReadDat())
{
printf("数据文件ENG001.IN不能打开!\n\007");
return;
}
encryChar();
WriteDat();
}

int ReadDat(void)
{
FILE *fp;
int i=0;
unsigned char *p;
if((fp=fopen("ENG001.IN","r"))==NUL

你把p定义成int型数据最好。fp=xx[i][j]*11 % 256 。
这里的数据xx[i][j]是字符型，但是乘11后就有可能超出字符型数据的范围。所以定义成int型就可以了。

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