BUPT-homework/semester2/pset3/1-filesOps.c

#include <stdio.h>

void countChar(FILE *fp);
void countLines(FILE *fp);
void countCaps(FILE *fp);

int main(void) {
  FILE *fp = fopen("dict.dic", "r");

  int op;
  scanf("%d", &op);
  switch (op) {
  case (1): {
    countChar(fp);
    break;
  }
  case (2): {
    countLines(fp);
    break;
  }
  case (3): {
    countCaps(fp);
    break;
  }
  default: {
    break;
  }
  }

  fclose(fp);
  return 0;
}

void countChar(FILE *fp) {
  int cap = 0, low = 0, digits = 0, others = 0;
  char buf;
  while ((buf = getc(fp)) != EOF) {
    if (buf >= 'A' && buf <= 'Z') {
      cap++;
    } else if (buf >= 'a' && buf <= 'z') {
      low++;
    } else if (buf >= '0' && buf <= '9') {
      digits++;
    } else {
      others++;
    }
  }
  printf("Task1:\n");
  printf("capital: %d\n", cap);
  printf("lowercase: %d\n", low);
  printf("digit: %d\n", digits);
  printf("others: %d\n", others);
}

void countLines(FILE *fp) {
  // Scan one line first
  char buf;
  int lines = 0;
  int linemax = 0;
  int linemin = 0;
  int i = 0;
  while ((buf = fgetc(fp)) != EOF) {
    if (buf != '\n') {
      i++;
    } else {
      if (lines == 0) {
        linemax = i;
        linemin = i;
      } else {
        if (i > linemax) {
          linemax = i;
        }
        if (i < linemin) {
          linemin = i;
        }
      }
      lines++;
      i = 0;
    }
  }
  printf("Task2:\nline: %d\n%d characters in max line.\n%d characters in min "
         "line.\n",
         lines, linemax, linemin);
}

void countCaps(FILE *fp) {
  int low[26] = {};
  int cap[26] = {};

  char buf;
  while ((buf = fgetc(fp)) != EOF) {
    if (buf >= 'a' && buf <= 'z') {
      low[buf - 'a']++;
    } else if (buf >= 'A' && buf <= 'Z') {
      cap[buf - 'A']++;
    }
  }

  printf("Task3:\n");
  printf("CAPITAL:\n");
  for (int i = 0; i < 26; i++) {
    printf("%c:%d\n", i + 'A', cap[i]);
  }

  printf("LOWERCASE:\n");
  for (int i = 0; i < 26; i++) {
    printf("%c:%d\n", i + 'a', low[i]);
  }
}