#include<stdio.h>
main()
{
int i,n,
sum;
printf(
"Input n:");
while(scanf(
"%d",&n)!=EOF)
{
sum=
0;
for(i=
1;i<=n;i++)
{
sum=
sum+i;
}
printf(
"sum=%d\n",
sum);
printf(
"Input n:");
}
return 0;
}
运行结果：
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