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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int a=2,d=3,sum=0;
  5.     int i=0,n;
  6.  
  7.     scanf("%d", &n);
  8.     do{
  9.         sum=sum+a;
  10.         a=a+d;
  11.         i=i+1;
  12.       }while(i<n);
  13.       printf("合計 %d\n",sum);
  14.  
  15. 	return 0;
  16. }
  17.  
Success #stdin #stdout 0s 4452KB
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合計 7
https://ideone.com/1KCNon
等差数列
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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