C Exercise Example 18
100 cases of classic C language
Title: Demand s = a + aa + aaa + aaaa + aa ... a value, where a is a number. For example, 2 + 22 + 222 + 2222 + 22222 (In this case the sum total of the number 5), a few numbers together with a keyboard control.
Program Analysis: The key is to calculate the value of each item.
Source Code:
// Created by www.w3big.com on 15/11/9.
// Copyright © 2015年 本教程. All rights reserved.
//
#include<stdio.h>
int main()
{
int s=0,a,n,t;
printf("请输入 a 和 n：\n");
scanf("a=%d,n=%d",&a,&n);
t=a;
while(n>0)
{
s+=t;
a=a*10;
t+=a;
n--;
}
printf("a+aa+...=%d\n",s);
return 0;
}
The above example output is:
请输入 a 和 n： a=2,n=5 a+aa+...=24690