入门练习1-9

#include <stdio.h>

int main(){

  int a, b,c;

  puts("请输入三个整数。");

  printf("整数1:");
  scanf("%d", &a);
  printf("整数2:");
  scanf("%d", &b);
  printf("整数3:");
  scanf("%d", &c);

  printf("他们的乘积是%d。\n", a+b+c);
return 0;}