C編程布爾表達式

Question

我想在c編程中編寫一個代碼，提示人們回答布爾值yes或no問題，然後相應地運行該操作。而不是IF或switch。

include <stdlib.h> 
include <stdio.h> 

int main() 
{ 
    int children; 
    int age; 

    printf("please enter your age"); 
    scanf("%d", age); 


    printf("are you married?, please enter y for Yes and n for No"\n\n); 
    scanf("%s", mstatus); 

    if (mstatus is y or Y) 
    { 
     printf("how many children do you have: \n\n") 
     scanf("%d", children) 
    } 

    return 0; 
} 

Answer 1

scanf("%d", age); 

應：

scanf("%d", &age); // missing an ampersand here. 

printf("are you married?, please enter y for Yes and n for No"\n\n); 

到

printf("are you married?, please enter y for Yes and n for No\n\n"); // newlines should be inside the format string 

雖然對方的回答解決您的問題，我相信使用一個switch-case這裏更好：

printf("are you married?, please enter y for Yes and n for No\n\n"); 
scanf("%c",&c); 


switch(c) 
{ 
case('y'): 
    printf("how many children do you have: \n\n"); 
    scanf("%d",&children); // Remember to put ampersand here 
    break; 
case('n'): 
    printf("Enjoy bachelorhood\n"); 
    break; 
default: 
    printf("Choice neither y nor n, Confused about marriage?\n"); 
} 

Answer 2

雖然沒有描述你所面臨的具體問題，我認爲我可以做以下的觀察有助於：

• 首先，scanf()需要讀取一個指針爲了工作。

  您已經聲明：

  int children; 
  int age; 
  

  ，所以你需要修改你的scanf()語句：

  scanf("%d", &age); 
  

  和

  scanf("%d", &children); 
  

  相應。

• 此外，您用來檢查答案的條件也需要修改。將其更改爲：

  if (mstatus == 'y' || mstatus == 'Y') 
  

• 另外，更改以下行：

  printf("are you married?, please enter y for Yes and n for No"\n\n); 
  

  到：

  printf("are you married?, please enter y for Yes and n for No\n\n"); 
  

，你不能有引號外面的換行。

• 最後，聲明：

  printf("how many children do you have: \n\n") 
  scanf("%d", children) 
  

  都需要在以分號結尾是有效的，就像這樣：

  printf("how many children do you have: \n\n"); 
  scanf("%d", children);