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  1. //Run it on codeblocks or Orwell/Bloodshed Dev C++ (Any termianl based program)
  2.  
  3. #include <stdio.h>         // Standard library for C input/output                
  4. #include <stdlib.h>        // Standard library definitions                       
  5. #define TERMINAL -9        // This is a macro that is defined globally           
  6.                            // it is used to tell the program that the user is    
  7.                            // done with their input.                             
  8. int main()                 // Main declaration with arguments
  9. {
  10. int userInput1,
  11.     userInput2,
  12.     nFact = 1,
  13.     kFact = 1,
  14.     n_k,
  15.     nkFact = 1,
  16.     combination;
  17.  
  18.  
  19.  
  20. do {
  21.  printf("\nEnter the number of items in the list (n): ");
  22.  scanf("%d", &userInput1);
  23.        if ( userInput1 < 1 || userInput1 > 10 ) /* is n between 1 - 10 */
  24.           printf("\n?Invalid input: Number must be between 1 and 10\n");
  25.        else  
  26.           break;
  27. } while ( userInput1 < 1 || userInput1 > 10 );
  28.  
  29.  
  30.  
  31.   /* As long as n>=1 program will loop the following n*n-1 */
  32.  
  33.  int n; 
  34.   for ( n = userInput1; n > 1; n--) {
  35.       nFact = ( nFact * n );
  36.   }    
  37.  
  38.   printf("n! = %d", nFact);
  39.  
  40.  
  41. do {
  42.  printf("\nEnter the number of items to choose (k): ");
  43.  scanf("%d", &userInput2);    
  44.        if ( userInput2 < 1 || userInput2 > 10 )  /* is k between 1 - 10 */
  45.           printf("\n?Invalid input: Number must be between 1 and 10\n");
  46.        else  
  47.           break;
  48. } while ( userInput2 < 1 || userInput2 > 10 );
  49. int k;
  50.   for ( k = userInput2; k > 1; k--) {
  51.       kFact = ( kFact * k );
  52.   }    
  53.  
  54.   printf("k! = %d", kFact);
  55. printf("n = %d k = %d", userInput1, userInput2);
  56. n_k = userInput1 - userInput2;
  57.   while (n_k>=1)
  58.   {
  59.         nkFact = ( nkFact * n_k );
  60.         n_k = ( n_k - 1 );
  61.   }     
  62. printf("\n(n-k)! = %d", nkFact);
  63. combination = nFact / ( (nkFact) * kFact );
  64. printf("\nNumber of combinations: %d", combination);
  65. printf("\n");
  66. system("PAUSE");
  67. return(0);                                  
  68. }
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https://ideone.com/Skiz96
language:
Text (text 6.10)
created:
10 years ago
visibility:
secret

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