计算一个三位数的个位，十位，百位之和

#include<stdio.h>

void   main()

int iNum,iSum;

int i1,i2,i3;

printf("请输入一个三位数:");

scanf("%d",iNum);

i1=iNum%10;

i2=iNum/10%10;

i3=iNum/100;

iSum=i1+i2+i3;

printf("%d",iSum);

}