C Program to find List Of Composite Numbers Based On User Input Limit

C Program To Find List Of Composite Numbers Upto Limit

This c program is used to find the composite numbers upto the user input limit.

What is composite number ?

A number greater than 1 which are not a prime number.

#include<stdio.h>                                                               
                                                                                                                                                                                                                                                                          
void main()                                                                     
{                                                                               
  int i, j, limit;                                                              
  int composite = 0;                                                            
  printf("Enter limit: ");                                                      
  scanf("%d", &limit);                                                          
                                                                                
  printf("Composite Numbers upto (%d): ", limit);                               
  for(i = 2;i <= limit;i++)                                                     
  {                                                                             
    composite = 0;                                                              
    for(j = i-1; j > 1 ; j--)                                                   
    {                                                                           
       if(i%j == 0)                                                             
         composite = 1;                                                         
    }                                                                           
    if(composite == 1)                                                          
     printf("%d\t", i);                                                         
  }                                                                             
  printf("\n");                                                                 
}                                                                        

$ cc composite-numbers-list.c 
$ ./a.out 
Enter limit: 100
Composite Numbers upto (100): 4	6	8	9	10	12	14	15	16	18
20	21	22	24	25	26	27	28	30	32	33	34	35	
36      38	39	40	42	44	45	46	48	49	50	51	52	
54	55	56	57	58	60	62	63	64	65	66	68	69	
70	7274	75	76	77	78	80	81	82	84	85	86	87	
88	90	91	92	93	94	95	96	98	99	100