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  1. #include <stdio.h>
  2. int difseq(int);
  3.  
  4. int main()
  5. {
  6. 	int num,i;
  7. 	printf("整数を入力⇒: \n");
  8. 	fflush(0);
  9. 	scanf("%d",&num);
  10.  
  11. for(i=1;i<=num;i++)
  12. printf("[%d] %d \n",i,difseq(i));
  13. }
  14.  
  15. int difseq(int n)
  16. {
  17.   if(n==1)
  18.   return 1 ;
  19.   else
  20.   return difseq(n-1)+ (n-1) ;
  21. }
  22.  
Success #stdin #stdout 0s 5308KB
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stdin
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7
stdout
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整数を入力⇒: 
[1] 1 
[2] 2 
[3] 4 
[4] 7 
[5] 11 
[6] 16 
[7] 22
https://ideone.com/r2GrOI
language:
C (gcc 8.3)
created:
15 hours ago
visibility:
public

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