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#include <stdio.h> #include <string.h> #define MAX 65536 #include <iostream> using namespace std; void reverse(char*str); void multi(char*n1,char*n2,char*result); int main() { char n1[MAX],n2[MAX],result[MAX*2]; int l=0; while (scanf("%s%s",n1,n2)!=EOF) { cout<<n1<<"*"<<n2<<"="; memset(result,0,sizeof(result)); multi(n1,n2,result); printf("%s\n",result); } return 0; } void multi(char*n1,char*n2,char*result) { int i,j,len1,len2,len; len1=strlen(n1); len2=strlen(n2); reverse(n2); reverse(n1); for (i=0;i<len1;i++) n1[i] -= '0'; for (i=0;i<len2;i++) n2[i] -= '0'; for (i=0;i<len2;i++) for (j=0;j<len1;j++) { len=i+j; result[len] += n2[i]*n1[j]; result[len+1] += result[len]/10; result[len] %= 10; } len=len1+len2-1; for (i=0;i<len;i++) result[i] += '0'; if (result[len]) result[len] += '0'; reverse(result); } void reverse(char*str) { int i; char c; for (i=0;i<strlen(str)/2;i++) { c=str[i]; str[i]=str[strlen(str)-i-1]; str[strlen(str)-i-1]=c; } }