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  1. #include <stdio.h>
  2.  
  3. int main(){
  4.     int a=1,n;
  5.     int sum=0;
  6.  
  7.     printf("正数を入力してください：\n");
  8.     scanf("%d",&n);
  9.  
  10.     while(a<=n){
  11.         sum=sum+a;
  12.         a=a+1;
  13.     }
  14.     printf("1から%dの合計は%dです。\n",n,sum);
  15.  
  16.     return 0;
  17. }
Success #stdin #stdout 0.01s 5308KB
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stdin
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10
stdout
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正数を入力してください：
1から10の合計は55です。
https://ideone.com/wlon8h
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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