5、题目：求s=a+aa+aaa+aaaa+aaa的值其中a是一个数字。例如2+22+222+2222+22222此时共有5个数相加几个数相加有键盘控制。1程序分析：关键是计算出每一项的值。2程序源代码：#includestdioh#includeconiohmainint ancount=1;long intsn=0tn=0;printfpleaseinputaandnn;scanfdd&a&n

#include "stdio.h" #include "conio.h"

int main() { int a, n, count = 1; long int sn = 0, tn = 0;

printf("please input a and n: ");
scanf("%d, %d", &a, &n);
printf("a = %d, n = %d\n", a, n);

while (count <= n) {
    tn = tn + a;
    sn = sn + tn;
    a = a * 10;
    count++;
}

printf("a + aa + ... = %ld\n", sn);
getch();
return 0;

}