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  1. #include<stdio.h>
  2. int main(void)
  3. {
  4.  
  5.  int x, a ;
  6.  int sum=0;
  7.  scanf("%d",&a);
  8.  for(x=1;x<=a; x++)
  9. {
  10.   sum=sum+x;
  11. }
  12. printf("1からaまでの和は%d",sum);
  13. return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5320KB
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1からaまでの和は6
https://ideone.com/aYLspg
language:
C (gcc 8.3)
created:
3 hours ago
visibility:
public

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