//计算求和
//Sn=a+aa+aaa+aaaa+aaaaa的前五项之和,其中a是一个数字
//如:2+22+222+2222+22222
#include<stdio.h>
#include<math.h>
#define A 2 //数字a
#define B 5 //前几项的和
int main()
{int n = 0;int sum = 0;int i = 0;for (i = 0; i <B; i++){n = A * pow(10, i) + n;sum = sum + n;printf("%6d ",n);}printf("\n");printf("Sn=%d",sum);return 0;
}
输出结果: