UVA10106

还是水题。。。

#include<stdio.h> #include<string.h> #define N 800 int main(){char s1[N], s2[N];int a[N], b[N], sum[N];int n, k;while (scanf("%s%s", s1, s2) != EOF){int l1 = strlen(s1);int l2 = strlen(s2);memset(sum, 0, sizeof(sum));memset(a , 0, sizeof(a));memset(b, 0, sizeof(b));k = 0, n = 0;for(int i = 0; i < l1; i++)a[i] = s1[l1 - i - 1] - '0';for(int i = 0; i < l2; i++)b[i] = s2[l2 - i - 1] - '0';for(int i = 0; i < l1; i++){for(int j = 0, k = i; j < l2; j++)sum[k++] += a[i] * b[j];}for(int i = 0; i < N; i++)if (sum[i] >= 10){sum[i + 1] += sum[i] / 10;sum[i] %= 10;}for(int i = N - 1; i >= 0; i--)if (sum[i] != 0){n = i;break;}for(int i = n; i >= 0; i--){if (n == 0){printf("0");break;}else printf("%d", sum[i]);}printf("\n");}return 0;}