problem 1.c

北大青鸟软件工程师ppt的学生用书源代码

#include<stdio.h>
void main()
{
 int number;
 int sum = 0;
 printf("\n请输入一个整数：");
 scanf("%d", &number);
 if(number > 0)
 {
  while(number > 0)
  {
   sum = sum + number;
   number = number - 1;
  }
  printf("\n和 = %d\n", sum);
 }
 else
   printf("\n %d无效。\n",number);
}