C 關(guān)鍵字

#include <stdio.h> 
int main(void) 
{
   float fRevenue, fCost; 
   fRevenue = 0; 
   fCost = 0; 
   /* profit = revenue - cost */ 
   printf("\nEnter total revenue: "); 
   scanf("%f", &fRevenue); 
   printf("\nEnter total cost: "); 
   scanf("%f", &fCost); 
   printf("\nYour profit is $%.2f\n", fRevenue - fCost); 
   
   return 0;
} 

#include <stdio.h>  
int main(void) 
{
   char cResponse = "\0"; 
   printf("\n\tAC Control Unit\n"); 
   printf("\na\tTurn the AC on\n"); 
   printf("b\tTurn the AC off\n"); 
   printf("\nEnter your selection: "); 
   scanf("%c", &cResponse); 
   if (cResponse == "a") 
      printf("\nAC is now on\n"); 
   if (cResponse == "b") 
      printf("\nAC is now off\n"); 
    
   return 0;
}