Program To Accept The Marks Obtained By A Student In 3 Subjects

/*  PROGRAM TO ACCEPT THE MARKS OBTAINED BY A STUDENT IN 3 SUBJECTS
 	  AND THEN DISPLAY WHETHER HE IS PASSED OR NOT BASED ON THE
 			     FOLLOWING CONDITIONS
 	   MIN.MARKS TO PASS IN EACH SUBJECT = 40 AND THEN DISPLAY
 	   GRADES BASED ON THE FOLLOWING DETAILS AND ALSO DISPLAY 
 		       APPROPRIATE REASONS FOR FAILURE
 
 		      120 -> 179        SECOND CLASS
 		      180 -> 239        FIRST  CLASS
 		      240 -> 300        DISTINCTION                     */
 
 #include<stdio.h>
 #include<conio.h>
 void main()
 {	int s1,s2,s3;
 	clrscr();
 	printf("\nEnter the marks obtained in 3 subjects\n\n");
 	scanf("%d%d%d",&s1,&s2,&s3);
 	if(s1>=40)
 	  { if(s2>=40)
 	      { if(s3>=40)
 		  { if((s1+s2+s3)<=179)
 		      printf("\nsecond class");
 		    else if((s1+s2+s3)<=239)
 		      printf("\nfirst class");
 		    else if((s1+s2+s3)<=300)
 		      printf("\ndistinction");
 		    else
 		      printf("\ninvalid marks");
 		  }
 		else
 		  printf("\nfailed due to less marks in s3");
 	      }
 	    else
 	      printf("\nfailed due to less marks in s2");
 	  }
 	else
 	  printf("\nfailed due to less marks in s1");
 	getch();
 }

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