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647 andrew_pro 1 
#include "stdio.h"
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#include "stdlib.h"
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#include "ctype.h"
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/*
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** atoi(s) - convert s to integer.
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*/
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int atoi(char *s)
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{
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  int sign, n;
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  while(isspace(*s)) ++s;
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  sign = 1;
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  switch(*s) {
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    case '-': sign = -1;
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    case '+': ++s;
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    }
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  n = 0;
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  while(isdigit(*s)) n = 10 * n + *s++ - '0';
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  return (sign * n);
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}