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  1. #include <stdio.h>
  2. //課題B-1: 1からnまでの和を求めるコードを完成させてください
  3. int sum(int x){
  4.    return (1+x)*x*1/2;
  5. }
  6.  
  7. int main(void) {
  8. 	int a,b,n;
  9.     a = n;
  10.     b = sum(a);
  11.     printf("1から%dまでの和は%d", a,b );
  12. 	return 0;
  13. }
  14.  
Success #stdin #stdout 0s 5280KB
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Standard input is empty
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1から0までの和は0
https://ideone.com/zv6ptE
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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