#include <stdio.h> 

    int main(void) 
    { 
        double result = 0.0; 
        int a = 5; 
        int b = 8; 
        result = (double)(a + b)/2 - (a + b)/(double)(a*a + b*b); 
        printf("%f", result); 
        return 0; 
    } 

  #include <stdio.h> 
  int main(void) 
  {
      char ch; 
      int i; 
      float fl; 
   
      fl = i = ch = "C";                                  
      printf("ch = %c, i = %d, fl = %2.2f\n", ch, i, fl); 
      ch = ch + 1;                                        
      i = fl + 2 * ch;                                    
      fl = 2.0 * ch + i;                                  
      printf("ch = %c, i = %d, fl = %2.2f\n", ch, i, fl); 
      ch = 1107;                                          
      printf("Now ch = %c\n",  ch);                       
      ch = 80.89;                                         
      printf("Now ch = %c\n", ch);                        
   
      return 0; 
  }