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  1. #include<stdio.h>
  2. int i=0;
  3.  
  4. int sum(int n){
  5.     i += n;
  6.     return i;
  7. }
  8.  
  9. int main(void){
  10.     int n;
  11.     scanf("%d", &n);
  12.  
  13.     for(int x=1; x<=n; x++){
  14.         if(x % 2 == 0){   // 偶数だけ足す
  15.             sum(x);
  16.         }
  17.     }
  18.  
  19.     printf("%d\n", i);    // 合計を出力
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5308KB
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stdin
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4
stdout
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6
https://ideone.com/TjYHjp
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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