關於這次作業的詢問

[魯智深]

同學的詢問是：為什麼跑出來有亂碼，底下是我修改過的部分程式碼

1. setvbuf的使用方法

如果要自己malloc，應該要malloc二次

或者直接傳NULL由libc負責分配

else

{ //fullybuffered

//根據man setvbuf 的解釋，系統會自動設定malloc然後設定buffer

/*

Except for unbuffered files, the buf argument should

point to a buffer at least size bytes long; this

buffer will be used instead of the current buffer.

If the argument buf is NULL, only the mode is af‐

fected; a new buffer will be allocated on the next read

or write operation.

*/

printf("unbuffered\n");

int buff_size = num;

//char *buf1 = (char *)malloc(buff_size);

//char *buf2 = (char *)malloc(buff_size);

assert(setvbuf(input, NULL, _IOFBF, buff_size) == 0);

assert(setvbuf(output, NULL, _IOFBF, buff_size) == 0);

}

2. fprintf的使用方法類似printf，要印出字串的話，在該字串後面一定要補上'\0'，這樣才是標準的Ｃ字串

if (inputChar == ' ')

{

if (linePos + buflen > 80)

{

fprintf(output, "\n");

total += linePos;

//printf("total:%d\t", total);

linePos = 0;

}

word_buf[buflen] = ' ';

//printf("%d, ", buflen);

//🐉 🐲 🌵 🎄 🌲 🌳 🌴

//在該字的後面加入Ｃ字串的結束符號'\0'

//🐉 🐲 🌵 🎄 🌲 🌳 🌴

//word_buf[buflen + 1] = '\0';

fprintf(output, "%s", word_buf);

linePos += buflen+1;

//printf("buflen:%d\t", buflen);

buflen = 0;

continue;

}