PAT（甲级）Scientific Notation (20)

题目：https://www.patest.cn/contests/pat-a-practise/1073

代码：

#include<cstdio>#include<cstring>#include<cstdlib>#include<algorithm>using namespace std;int main(){ char str[10010];gets(str);int len=strlen(str);if(str[0]== '-') printf("-");int pos=0;while(str[pos]!='E'){  pos++;}int exp=0;for(int i=pos+2;i<len;i++){   exp=exp*10+(str[i]-'0');}if(exp==0){for(int i=1;i<pos;i++){   printf("%c",str[i]);}}if(str[pos+1]=='-'){    printf("0.");for(int i=0;i<exp-1;i++){ printf("0");}printf("%c",str[1]);for(int i=3;i<pos;i++){    printf("%c",str[i]);}}else{for(int i=1;i<pos;i++){   if(str[i]=='.') continue;   printf("%c",str[i]);   if(i ==exp+2&&pos-3!=exp){   printf(".");   }}for(int i=0;i<exp-(pos-3);i++){printf("0");}}   system("pause");}