ACM 10696 - f91

#include <stdio.h>
char output[5000000], input[15];
int index = -1;

int getInt()
{
    char ch;
    int n = 0;
    while( ch = getchar())
        if(ch != ' ' && ch != '\n') break;
    n = ch - 48;
    while( ch = getchar())
    {
        if(ch == ' ' || ch == '\n') break;
        n = n * 10 + ch - 48;
    }
    return n;
}
int main()
{
    int i, n, j;
    char ch;
    while (gets(input) && input[0] != '0')
    {
        output[++ index] = 'f', output[++ index] = '9', output[++ index] = '1',
        output[++ index] = '(';
        for (i = 0; input[i]; i ++)
            output[++ index] = input[i];
        output[++ index] = ')', output[++ index] = ' ', output[++ index] = '=',
        output[++ index] = ' ';
        sscanf(input, "%d", &n);
        if (n <= 100) n = 91;
        else n -= 10;
        
        for (i = 0 ;n ; n /= 10, i ++)
            input[i] = (n % 10) + '0';
        for (j = i - 1; j >= 0; j --)
            output[++ index] = input[j];        
        
        output[++ index] = '\n';
    }
    output[index] = '\0';
    puts(output);
    return 0;
}

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