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  1. #include <stdio.h>
  2.  
  3. main()
  4. {
  5. 	int i, j; // i는 단, j는 곱하는 수
  6.  
  7.  
  8. 	for (i = 1; i < 10; i += 3){
  9. 		for (j = 1; j < 10; j++){
  10. 			// 구구단 출력 ( 1 * 1 = 1   2 * 1 = 2   3 * 1 = 3...)
  11. 			printf("%d * %d = %-2d	%d * %d = %-2d	%d * %d = %-2d\n", 
  12.             i, j, (i*j), i+1, j, (i+1)*j, i+2, j, (i+2)*j);
  13. 		}
  14.  
  15. 		printf("\n"); // j 루프가 끝나면 개행
  16. 	}
  17. }
Success #stdin #stdout 0s 9424KB
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stdin
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Standard input is empty
stdout
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1 * 1 = 1 	2 * 1 = 2 	3 * 1 = 3 
1 * 2 = 2 	2 * 2 = 4 	3 * 2 = 6 
1 * 3 = 3 	2 * 3 = 6 	3 * 3 = 9 
1 * 4 = 4 	2 * 4 = 8 	3 * 4 = 12
1 * 5 = 5 	2 * 5 = 10	3 * 5 = 15
1 * 6 = 6 	2 * 6 = 12	3 * 6 = 18
1 * 7 = 7 	2 * 7 = 14	3 * 7 = 21
1 * 8 = 8 	2 * 8 = 16	3 * 8 = 24
1 * 9 = 9 	2 * 9 = 18	3 * 9 = 27

4 * 1 = 4 	5 * 1 = 5 	6 * 1 = 6 
4 * 2 = 8 	5 * 2 = 10	6 * 2 = 12
4 * 3 = 12	5 * 3 = 15	6 * 3 = 18
4 * 4 = 16	5 * 4 = 20	6 * 4 = 24
4 * 5 = 20	5 * 5 = 25	6 * 5 = 30
4 * 6 = 24	5 * 6 = 30	6 * 6 = 36
4 * 7 = 28	5 * 7 = 35	6 * 7 = 42
4 * 8 = 32	5 * 8 = 40	6 * 8 = 48
4 * 9 = 36	5 * 9 = 45	6 * 9 = 54

7 * 1 = 7 	8 * 1 = 8 	9 * 1 = 9 
7 * 2 = 14	8 * 2 = 16	9 * 2 = 18
7 * 3 = 21	8 * 3 = 24	9 * 3 = 27
7 * 4 = 28	8 * 4 = 32	9 * 4 = 36
7 * 5 = 35	8 * 5 = 40	9 * 5 = 45
7 * 6 = 42	8 * 6 = 48	9 * 6 = 54
7 * 7 = 49	8 * 7 = 56	9 * 7 = 63
7 * 8 = 56	8 * 8 = 64	9 * 8 = 72
7 * 9 = 63	8 * 9 = 72	9 * 9 = 81
https://ideone.com/vGAL9X
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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