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