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poj 3332 Parsing Real Numbers

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poj 3332 Parsing Real Numbers

#include<stdio.h>#include<string.h>#include<ctype.h>#define MAXD 1010int n, pat;char b[MAXD];void init(){    int i, j, k, p;    gets(b);    for(i = 0; b[i] == ' '; i ++);    for(j = strlen(b) - 1; b[j] == ' '; j --);    for(k = 0, p = i; p <= j; p ++, k ++)        b[k] = b[p];    b[k] = '';    n = k;}void pattern(int i){    if(pat == 0)    {        if(b[i] == '+' || b[i] == '-') pat = 1;        else pat = 2;    }    else if(pat == 1)    {        pat = 2;    }    else if(pat == 2)    {        if(b[i] == '.') pat = 3;        else if(b[i] == 'e' || b[i] == 'E') pat = 5;    }    else if(pat == 3)    {        pat = 4;    }    else if(pat == 4)    {        if(b[i] == 'e' || b[i] == 'E') pat = 5;    }    else if(pat == 5)    {        if(b[i] == '+' || b[i] == '-') pat = 6;        else pat = 7;    }    else if(pat == 6)    {        pat = 7;    }}int check(int i){    if(pat == 1)    {        if(b[i] == '+' || b[i] == '-') return 1;        else return 0;    }    else if(pat == 2)    {        if(isdigit(b[i])) return 1;        else return 0;    }    else if(pat == 3)    {        if(b[i] == '.') return 1;        else return 0;    }    else if(pat == 4)    {        if(isdigit(b[i])) return 1;        else return 0;    }    else if(pat == 5)    {        if(b[i] == 'e' || b[i] == 'E') return 1;        else return 0;    }    else if(pat == 6)    {        if(b[i] == '+' || b[i] == '-') return 1;        else return 0;    }    else    {        if(isdigit(b[i])) return 1;        else return 0;    }}int solve(){    int i;    pat = 0;    for(i = 0; i < n; i ++)    {        pattern(i);        if(!check(i)) return 0;    }    if(pat == 2 || pat == 4 || pat == 7)        return 1;    else        return 0;}int main(){    int t;    gets(b);    sscanf(b, "%d", &t);    while(t --)    {        init();        if(solve()) printf("LEGALn");        else printf("ILLEGALn");    }    return 0;}
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