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  1. #include <stdio.h>
  2.  
  3. int sum(int n){
  4.     int c=0;
  5.     for (int i=1; i<=n; i++){
  6.         c+=i;
  7.     }
  8.     return c;
  9. }
  10.  
  11. int main(void) {
  12.     int a, b;
  13.     scanf("%d",&a);
  14.     b = sum(a);
  15.     printf("1から%dまでの和は%d", a, b);
  16.     return 0;
  17. }
Success #stdin #stdout 0s 5320KB
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stdin
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11
stdout
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1から11までの和は66
https://ideone.com/9GnjGQ
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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