C语言编程题

时间:2024-06-15 04:35:45 资料大全 我要投稿
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C语言编程题

  1)读文件file1.txt的内容(例如):

  12

  34

  56

  输出到file2.txt:

  56

  34

  12

  (逆序)

  第一题,注意可增长数组的应用.

  #include

  #include

  int main(void)

  {

  int MAX = 10;

  int *a = (int *)malloc(MAX * sizeof(int));

  int *b;

  FILE *fp1;

  FILE *fp2;

  fp1 = fopen(“a.txt”,”r”);

  if(fp1 == NULL)

  {printf(“error1″);

  exit(-1);

  }

  fp2 = fopen(“b.txt”,”w”);

  if(fp2 == NULL)

  {printf(“error2″);

  exit(-1);

  }

  int i = 0;

  int j = 0;

  while(fscanf(fp1,”%d”,&a[i]) != EOF)

  {

  i++;

  j++;

  if(i >= MAX)

  {

  MAX = 2 * MAX;

  b = (int*)realloc(a,MAX * sizeof(int));

  if(b == NULL)

  {

  printf(“error3″);

  exit(-1);

  }

  a = b;

  }

  }

  for(;–j >= 0;)

  fprintf(fp2,”%d\n”,a[j]);

  fclose(fp1);

  fclose(fp2);

  return 0;

  }

  可谓是反序的经典例程.

  void inverse(char *p)

  {

  if( *p = = ‘\0′ )

  return;

  inverse( p+1 );

  printf( “%c”, *p );

  }

  int main(int argc, char *argv[])

  {

  inverse(“abc\0″);

  return 0;

  }

  借签了楼上的“递规反向输出”

  #include

  void test(FILE *fread, FILE *fwrite)

  {

  char buf[1024] = {0};

  if (!fgets(buf, sizeof(buf), fread))

  return;

  test( fread, fwrite );

  fputs(buf, fwrite);

  }

  int main(int argc, char *argv[])

  {

  FILE *fr = NULL;

  FILE *fw = NULL;

  fr = fopen(“data”, “rb”);

  fw = fopen(“dataout”, “wb”);

  test(fr, fw);

  fclose(fr);

  fclose(fw);

  return 0;

  }

  在对齐为4的情况下

  struct BBB

  {

  long num;

  char *name;

  short int data;

  char ha;

  short ba[5];

  }*p;

  p=0×1000000;

  p+0×200=____;

  (Ulong)p+0×200=____;

  (char*)p+0×200=____;

  希望各位达人给出答案和原因,谢谢拉

  解答:假设在32位CPU上,

  sizeof(long) = 4 bytes

  sizeof(char *) = 4 bytes

  sizeof(short int) = sizeof(short) = 2 bytes

  sizeof(char) = 1 bytes

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