#include
#include
int main(void )
{ int i,n,sum;
printf("input n；");
scanf("%d",&n);
sum = 0;
for(i=1;i<=n;i++)
{
sum=sum+i;
}
printf("sum=%dn",sum);
return 0;
}
#include
#include
int main(void )
{ int i,n,sum;
printf("input n；");
scanf("%d",&n);
sum = 0;
for(i=1;i<=n;i++)
{
sum=sum+i;
}
printf("sum=%dn",sum);
return 0;
}
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