=================100！字符实现============================================
#include <stdio.h>#define N 10000int main(int argc, char mndlsargv) {char data[ N ] = { '1', '0'};int digit, i, index, carry;int tmp;for ( i = 2, digit = 0; i <= 100; i++ ){for ( index = 0, carry = 0; index <= digit; index++ ){tmp = (data[ index ] - '0') * i + carry;data[ index ] = tmp % 10 + '0'; carry = tmp / 10;}while ( carry ){data[ ++digit] = carry % 10 + '0';carry /= 10;}}for ( i = digit; i >= 0; i-- ){printf( "%c", data[ i ] );}printf( "/n============%d=============/n", digit );return 0;}
=================1000！整数实现===========================================
#include <stdio.h>#define N 10000int main(int argc, char mndlsargv) {int data[ N ] = { 1 };int digit, i, index, carry;int tmp;for ( i = 2, digit = 0; i <= 1000; i++ ){for ( index = 0, carry = 0; index <= digit; index++ ){tmp = data[ index ] * i + carry;data[ index ] = tmp % 10000;carry = tmp / 10000;}while ( carry ){data[ ++digit] = carry % 10000;carry /= 10000;}}printf( "%d", data[ digit ] );for ( i = digit - 1; i >= 0; i-- ){printf( "%04d", data[ i ] );}printf( "/n============%d=============/n", digit );return 0;}