main()                                                      
   {                                                           
       int a, b, c, d;                                         
       float ratio;                                            
                                                               
       printf("Enter four integer values\n");                  
       scanf("%d %d %d %d", &a, &b, &c, &d);                   
                                                               
       if (c-d  != 0)  /* Execute statement block */
                                        
       {                                                     
           ratio = (float)(a+b)/(float)(c-d);                  
           printf("Ratio = %f\n", ratio);                      
       }                                                     
   }                                                           
                 
                                              
Output                                                      
                                                               
   Enter four integer values                                   
   12  23  34  45                                              
   Ratio = -3.181818                                           
                                                               
   Enter four integer values                                   
   12  23  34  34