c程序设计语言（第二版.新版）习题1_22.pdfVIP

c程序设计语⾔（第⼆版.新版）习题1_22 /* 把较长的输⼊⾏折成短⼀些的两⾏或多⾏,折⾏的位置在输⼊⾏的第n列之前的最后⼀个 ⾮空格之后.要保证程序能够智能地处理输⼊⾏很长以及在指定的列前没有空格或 制表符时情况 */ #includestdio.h #define stopbit 8 /* 制表符终⽌位 */ #define MAXSIZE 120 /* ⾏上限 */ #define MAXLINE 1010 /* 允许的输⼊⾏的最⼤长度1000 */ typedef signed char int8_t; static void changeline(int8_t s[]); static int getline(int8_t s[], int lim); int main(void) { int8_t line[MAXLINE] = { 0 };// 当前的输⼊⾏ int i = 0; int len; freopen(C:\\\\Users\\wwwzh\\Desktop\\data.in, r, stdin); freopen(C:\\\\Users\\wwwzh\\Desktop\\data.out, w, stdout); while ((len = getline(line, MAXLINE)) 0) { if (len = MAXSIZE) changeline(line); printf(%s, line); } return 0; } extern int detab(char s[]); /* getline 函数: 将⼀⾏读⼊到s中并返回其长度 遇到EOF返回0,每⼀⾏⾄少包含⼀个字符,只包含换⾏符的⾏,其长度为1 */ static int getline(int8_t s[], int lim) { int c, i; for (i = 0; i lim - 1 (c = getchar()) != EOF c != \n; i++) s[i] = c; if (c == \n) { s[i] = c; i++; } s[i] = \0; detab(s); i = 0; while (s[i] != \0)i++; return i; } /* 把较长的输⼊⾏折成短⼀些的两⾏或多⾏,折⾏的位置在输⼊⾏的第n列之前的最后⼀个 ⾮空格之后 */ static void changeline(int8_t s[]) { //第⼀步,把s弄到⼀个⼆维数组 int8_t array[8][MAXSIZE] = { 0 }; int i = 0, j = 0, k = 0; while (s[k] != \0) { if (j == MAXSIZE - 1) array[i][j] = \n; j = 0; i++; } array[i][j] = s[k]; j++; k++; } //第⼆步,把各数组结尾的空格赋值为-1 while (i = 0) j = MAXSIZE - 2; while (array[i][j] == ) array[i][j] = -1; j--; } i--; } //第三步,除-1外⼆维数组所有都拼接到s i = j = k = 0; while (array[i][j] != 0) if (array[i][j] != -1) s[k] = array[i][j]; k++; } j++; if (j == MAXSIZE) i++; j = 0; } } s[k] = \0; }