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  1. #include <stdio.h>
  2.  
  3. int main(void) 
  4. {
  5. 	int num;
  6. 	int i;
  7. 	int flag = 0; /* 0:先頭、1:先頭以外*/
  8.  
  9. 	scanf("%d", &num);
  10.  
  11. 	/* 入力が１の場合*/
  12. 	if(num == 1) {
  13. 		printf("%d =% d\n", num, num);
  14. 	}
  15. 	/*入力が2以上の場合*/
  16. 	else {
  17. 		printf("%d=", num);
  18. 		i=2;
  19. 		while(i<=num){
  20. 			if(num % i == 0) {
  21. 			/* 最初の素因数の場合はb× なし*/
  22. 				if(flag==0) {
  23. 					printf("%d", i);
  24. 					/* フラグを立てる */
  25. 					flag = 1;
  26. 				}
  27. 				/* 2番目以降の素因数の場合は　×　あり*/
  28. 				else {
  29. 					printf("×%d", i);
  30. 				}
  31. 				num = num / i;
  32. 				i=1;
  33. 			}
  34. 			i=i+1;
  35. 		}
  36. 	}
  37.  
  38. 	return 0;
  39. }
  40.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin 
202303997
stdout 
202303997=7×7×199×20747
https://ideone.com/aMVX2O
language:
C (gcc 8.3)
created:
6 hours ago
visibility:
public

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