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  1. #include <stdio.h>
  2. int main(void)
  3. {
  4.     int  i, n, sum;
  5.     printf("Input n:");
  6.     scanf("%d", &n);
  7.     i = 1;
  8.     sum = 0;                     /* 累加和变量初始化为0 */
  9.     do{
  10.     	sum = sum  + i;
  11.     	i++;
  12.     }while(i<=n);
  13.     printf("sum = %d\n", sum);
  14.     return 0;
  15. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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100
stdout
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Input n:sum = 5050
https://ideone.com/op9buo
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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