编程输入任意三个整数,求它们的和及平均值c程序设计

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#include
void main()
{int i1,i2,i3,sum,avg;
scanf(%d,&i1);
scanf(%d,&i2);
scanf(%d,&i3);
sum=i1+i2+i3;
avg=sum/3;
printf(sum is %d\n,sum);
printf(avg is %d\n,avg);
getch();
}