Question

C语言：键入正整数N(1~100)，求1到N的各个整数的各位数字之和，咋写？

Answer 1

代码文本：

#include "stdio.h"

int main(int argc,char *argv[]){

int s,N,t,k;

printf("Enter N(int 0<N<101)...\n");

if(scanf("%d",&N)==1 && N>0 && N<101){

for(s=0,t=1;t<=N;t++)

for(k=t;k;s+=k%10,k/=10);

printf("The result is %d\n",s);

}

else

printf("Input error, exit...\n");

return 0;

}

Answer 2

#include <stdio.h>

int main()
{
int n,sum,i,t;
while(scanf("%d",&n)==1)
{
for(i=1,sum=0;i<=n;++i)
for(t=i;t;t/=10)
sum+=t%10;
printf("%d\n",sum);
}
return 0;
}