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atoi.c
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1979-01-10
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279 b
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25 lines
atoi(p)
register char *p;
{
register int n;
register int f;
n = 0;
f = 0;
for(;;p++) {
switch(*p) {
case ' ':
case '\t':
continue;
case '-':
f++;
case '+':
p++;
}
break;
}
while(*p >= '0' && *p <= '9')
n = n*10 + *p++ - '0';
return(f? -n: n);
}