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/*
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**这个程序从标准输入中读取行并在标准输出中打印这些输入行,
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**每个输入行的后面一行是该行内容的一部分
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**
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**输入的第1行是一串列标号,串的最后一个以负数结尾。
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**这些列标号成对出现,说明需要打印的输入行的列的范围
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**例如。0 3 10 12 -1 表示第0列到第3列,第10列到第12列的内容将被打印。
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAX_COLS 20 /* 所能处理的最大列号*/
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#define MAX_INPUT 1000 /*每个输入行的最大长度*/
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int read_column_numbers(int columns[], int mex);
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void rearrange(char *output, char const *input, int n_coulumns, int const columns[]);
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int main(void)
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{
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int n_columns; /*进行处理的列标号*/
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int columns[MAX_COLS]; /*需要处理的列数*/
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char input[MAX_INPUT]; /*容纳输入行的数组*/
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char output[MAX_INPUT]; /*容纳输出行的数组*/
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/*
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**读取该串列标号
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*/
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n_columns = read_column_numbers(columns, MAX_COLS);
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/*读取、处理和打印剩余的输入行*/
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while(gets(input) != NULL)
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{
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printf("Original input : %s\n", input);
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rearrange(output, input, n_columns, columns);
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printf("Rearranged line : %s\n", output);
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}
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return EXIT_SUCCESS;
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}
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/*读取列标号,如果超出规定范围则不予理会*/
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int read_column_numbers(int columns[], int max)
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{
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int num = 0;
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int ch;
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/*取得列标号,如果所读取的数小于0则停止*/
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while(num < max && scanf("%d", &columns[num]) == 1
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&& columns[num] >= 0)
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{
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num += 1;
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}
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/*确认已经读取的标号为偶数个,因为它们是以对的形式出现的*/
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if(num % 2 != 0)
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{
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puts("Last column number is not paired.");
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exit(EXIT_FAILURE);
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}
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/*丢弃该行中包含最后一个数字的那部分内容*/
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while( (ch = getchar()) != EOF && ch != '\n')
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;
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return num;
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}
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/*处理输入行,将指定列的字符连接在一起,输出行以NULL结尾*/
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void rearrange(char *output, char const *input,
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int n_columns, int const columns[])
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{
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int col; /*columns数组的下标*/
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int output_col; /*输出列计数器*/
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int len; /*输入行的长度*/
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len = strlen(input);
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output_col = 0;
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/*处理每对列标号*/
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for(col = 0; col < n_columns; col +=2)
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{
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int nchars = columns[col + 1] - columns[col] + 1;
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/*如果输入行结束或输出行数已满,就结束任务。*/
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if(columns[col] >= len || output_col == MAX_INPUT -1)
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break;
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/*如果输出行数数组空间不够,只复制可以容纳的数据*/
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if(output_col + nchars > MAX_INPUT - 1)
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{
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nchars = MAX_INPUT - output_col - 1;
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}
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/*复制相关的数据*/
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strncpy(output + output_col, input + columns[col], nchars);
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output_col += nchars;
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}
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output[output_col] = '\0';
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}
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