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864天前#include <stdio.h> |
#include <stdlib.h> |
#include <string.h> |
#define MAXN 1000 |
int ans[MAXN], result[MAXN], Baselen; |
int Mul(int base[], int len); |
int main() |
{ |
int i, j; |
int n = 0, pos, c, len, count, base[6]; |
char R[6]; |
memset(R, '0', sizeof(R)); |
memset(result, 0, sizeof(result)); |
memset(base, 0, sizeof(base)); |
while (scanf("%s%d", R, &n)==2) |
{ |
Baselen = strlen(R); |
pos = 0; |
c = 0; |
len = 0; |
count = 0; |
memset(result, 0, sizeof(result)); |
for (i=Baselen-1; i>=0; i--) |
{ |
if (R[i]) break; |
} |
Baselen = i; |
for (i=0; i<Baselen+1; i++) |
{ |
if (R[i] != '.') result[c++] = R[i]-'0'; |
else pos = Baselen-i; |
} |
memcpy(base, result, sizeof(base)); |
len = Baselen; |
for (i=1; i<n; i++) |
{ |
if (n==1) break; |
len = Mul(base, len); |
} |
pos = n*pos; |
i = 0; |
while (result[i]==0&&i<len-pos) i++; |
count = i; |
for (i=MAXN-1; i>=0; i--) if (result[i]) break; |
j = i; |
for (i=count; i<=j; i++) |
{ |
if (i ==len-pos) printf("."); |
printf("%d", result[i]); |
} |
printf("\n"); |
} |
return 0; |
} |
int Mul(int base[], int len) |
{ |
memset(ans, 0, sizeof(ans)); |
int c = 0, k = 0; |
int i, j; |
for (i=Baselen-1; i>=0; i--) |
{ |
for (j=len-1, c=Baselen-1-i; j>=0; j--) |
{ |
ans[c++] += base[i]*result[j]; |
} |
} |
for (i=0; i<MAXN-1; i++) |
{ |
ans[i+1] += ans[i]/10; |
ans[i] %= 10; |
} |
for (i=MAXN-1; i>=0; i--) |
{ |
if (ans[i]||i == c) break; |
} |
for ( ; i>=0; i--)result[k++] = ans[i]; |
return c+1; |
} |
