c - 扫描单个字符 C

Question

/*
Program to calculate trip and plan flights
*/
#define TRIP 6
#define DEST 1
#include <stdio.h>

int error_dest(int type_num, int cont_num, int dest_code, int check);


int main(void)
{
  int check, type_num, cont_num, index, i, dest_code, trip_num, row, col;
  int travelint[TRIP][DEST], travelarea[TRIP];
  char area_code, S, M, L, N, P, K, R, C, U, W, O;

  trip_num = 7;
  while (trip_num > TRIP)
  {
    printf("Please enter the number of trips:");
    scanf("%d", &trip_num);
    if ( trip_num < TRIP)
    { 
      printf("Valid trip number. Please proceed to enter destination code.\n");
    }
    else
    {
      printf("Invalid trips. Please enter no more then 6 trips.\n");
    }
  }

  /*********************************************************************************/

  for (i=0; i < trip_num ; i++)  /*destination code input*/
  {   
    printf("Please enter destination code:");
    scanf("%d", &dest_code);                   /*input of destination code*/
    check = error_dest(type_num, cont_num, dest_code, check);
    if (check == 2)
    { travelint[i][0]=dest_code; }
    else
    {
      while (check == 1)
      {
        printf("Please enter destination code:");
        scanf("%d", &dest_code);                   /*input of destination code*/
        check = error_dest(type_num, cont_num, dest_code, check);
        if (check == 2)
        { travelint[i][0]=dest_code; }

      }
    }
    printf("Please select from the following that best describes your destination:\n");
    printf("S Small city - population under 50,000\n");
    printf("M Medium city - population between 50,000 and 500,000\n");
    printf("L Large city - pop. over 500,000\n");
    printf("N Natural formation like a mountain, a lake, a cave, a geyser, a fjord, a canyon, etc.\n");
    printf("P Designated park or reserve such as a wildlife refuge, a national park, a bioreserve, or a protected marine area\n");
    printf("K Man made landmark like the Great Wall of China, the Taj Mahal, or Stonehenge\n");
    printf("R State or province or region of a country\n");
    printf("C Whole country\n");
    printf("U Multiple countries like traveling through Europe\n");
    printf("W Ocean voyage\n");
    printf("O Any other type of destination - such as visiting the sites of the seven wonders of the world\n");
    printf("Please enter the Area Letter code:");
    scanf("%c", &area_code);       

  }
  /*******************************************************************************/

  /*print for destination_code*/

  for (row = 0; row < trip_num; row++)
  {
    for (col=0; col < DEST; col++)
      printf("Trip[%d] = %d\n", row+1, travelint[row][col]);
  }

  return 0;  

}

error_dest(type_num, cont_num, dest_code, check)
{   
  cont_num = dest_code / 10000;             /*math for error check*/
  type_num = dest_code/1000 - cont_num*10;  

  if ( (cont_num <= 7) && (cont_num > 0) &&  (type_num <= 5) && (type_num >=0) )
  { /* loop for checking destination code*/
    check = 2 ;
    return check;
  }
  else
  {
    printf("%d is a invalid code\n", dest_code);
    check = 1;
    return check;
  }
}

由于一些奇怪的原因在 scanf("%c", &area_code);它只是向前运行并打印 dest_code 数组而不让我输入任何字符，我不确定我到底做错了什么。

Answer 1

如果您只想获取一个字符，也许使用 getchar() 而不是 scanf() 会更好？