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  1. #include <stdio.h>
  2. int sum(int m,int n){
  3. 	if(m>n) return 0;
  4. 	if(m==n) return m;
  5. 	return m + sum(m+1,n);
  6. }
  7.  
  8. int main(void) {
  9. 	int a,b;
  10. 	scanf("%d%d",&a,&b);
  11.  
  12. 	if(a<=0 || b<=0|| a>b){
  13. 		printf("エラー");
  14. 	return 1;}
  15. 	int result=sum(a,b);
  16. 	printf("%dから%dまでの和は%dです",a,b,result);
  17.  
  18.  
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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2 3
stdout
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2から3までの和は5です
https://ideone.com/dtIcsC
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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