平成30年度春期基本情報技術者試験 午後 問9 プログラム1

h30h_fe_pm9_1.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define recSize 1002            /* 入力レコードの最大文字数 + 2('\n', '\0') */

void outList(char *dataFile, char *listFile,
             int keyPos, int keyLen, int valuePos, int valueLen) {
  FILE *inFile, *outFile;
  char inBuf[recSize], inKey[10], key[10], temp[10];
  long count, inValue, value;
  char format[] = " %9s %9ld %9ld\n";
  key[keyLen] = '\0';
  inKey[keyLen] = '\0';
  temp[valueLen] = '\0';
  outFile = fopen(listFile, "w");
  inFile = fopen(dataFile, "r");
  if (fgets(inBuf, recSize,inFile) != NULL) {
    strncpy(key, inBuf + keyPos, keyLen);
    count = 1;
    value = atol(strncpy(temp, inBuf + valuePos, valueLen));
    while (fgets(inBuf, recSize,inFile) != NULL) {
      strncpy(inKey, inBuf + keyPos, keyLen);
      inValue = atol(strncpy(temp, inBuf + valuePos, valueLen));
      if (strcmp(key, inKey) != 0) {
        fprintf(outFile, format, key, count, value);
        count = 1;
        strcpy(key, inKey);
        value = inValue;
      }
      else {
        count++;
        value += inValue;
      }
    }
    fprintf(outFile, format, key, count, value);
  }
  fclose(inFile);
  fclose(outFile);
}

int main(int argc, char *argv[])
{
#ifdef Q1
  /* 設問1: 図1を利用 */
  outList(argv[1], argv[2], 16, 6, 28, 6);
#endif
#ifdef Q2
  /* 設問2: 図3を利用 */
  outList(argv[1], argv[2], 9, 2, 29, 6);
#endif  
  return 0;
}

http://maehrm.hatenablog.com/entry/2018/04/23/051536