C语言大作业

#include<stdio.h> void main() { long mul,number,k,ll,kk,n; puts("============================================================"); puts("|| This program will find the automorphic numbers. ||"); puts("|| The defination of a automorphic number is: the mantissa||"); puts("|| of a natural number's square equals to itself. ||"); puts("|| e.g., 25^2=625, 76^2=5776, 9376^2=87909376. ||"); puts("============================================================"); printf("\n >> Please input the scale n you want to find : "); scanf("%ld",&n); printf("\n >> The automorphic numbers small than %ld are:\n\n",n); for(number=0;number<n;number++) { for(mul=number,k=1;(mul/=10)>0;k*=10); /*由number的位数确定截取数字进行乘法时的系数k*/ kk=k*10; /*kk为截取部分积时的系数*/ mul=0; /*积的最后n位*/ ll=10; /*ll为截取乘数相应位时的系数*/ while(k>0) { mul=(mul+(number%(k*10))*(number%ll-number%(ll/10)))%kk; /*(部分积+截取被乘数的后N位*截取乘数的第M位)，%kk再截取部分积*/ k/=10; /*k为截取被乘数时的系数*/ ll*=10; } if(number==mul) /*判断若为自守数则输出*/ printf("%ld ",number); } puts("\n\n >> Press any key to quit..."); getchar(); }