C语言: 输入一个正整数,求出它是几位数;输出原数和位数

#include <stdio.h>
#include <stdlib.h>
int main()
{int i=1;
long int num,num1;
scanf("%ld",&num);
num1=num;
while(num/10){
i++;
num=num/10;
}
printf("number:%ld, width: %d\n",num1,i);
system("pause");
return 0;
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