Question

两个大数相乘的程式，但online judge 一直显示 wrong answer 哪位大大可以帮我找出错误的 testcase

Problem DescriptionCompute A*B.
InputFor each case a line, there will be two positive integers A and B < 10^100.
OutputFor each case a line, output the answer A*B.

Sample Input
25 16
897 9945
123456789 987654321
Sample Output
400
8920665
121932631112635269

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(){

char A[105];
char B[105];
char C[105][105];
char D[210];
char *e,q;
int i,j,t,k,c;
while (scanf("%s %s",A,B)!=EOF) {
for (i=0; i<210; i++)
D[i]='0';
k=0;
for (i=strlen(A)-1;i>=0; i--) {
t=0;
e=C[k];
for (j=strlen(B)-1; j>=0; j--) {
*e=(t+(B[j]-'0')*(A[i]-'0'))%10+'0';
e++;
t=(t+(B[j]-'0')*(A[i]-'0'))/10;
}
if (t){
*e=t+'0';
e++;
}
*e='\0';
k++;
}
for (i=0; i<k; i++) {
c=0;
for (j=i; j<strlen(C[i])+i; j++) {
q=(C[i][j-i]-'0'+D[j]-'0'+c)%10+'0';
c=(C[i][j-i]-'0'+D[j]-'0'+c)/10;
D[j]=q;
}
if(c)
D[j++]=c+'0';
}
D[j]='\0';
for (i=strlen(D); i>=0; i--)
printf("%c",D[i]);
printf("\n");

}

return0;
}

Answer 1

大数乘法我也刚写过，反正方法跟网上流行的不同，建议你把字符都减去'0'后再进行计算，显示之前在加上'0'，这样比较容易检查错误