Atoi

 https://www.interviewbit.com/old/problems/atoi/

while (str[i] == ' ') { i++; }
if (str[i] == '-' || str[i] == '+') {
sign = (str[i++] == '-') ? -1 : 1;
}
while (str[i] >= '0' && str[i] <= '9') {
if (base > INT_MAX / 10 || (base == INT_MAX / 10 && str[i] - '0' > 7)) {
if (sign == 1) return INT_MAX;
else return INT_MIN;
}
base = 10 * base + (str[i++] - '0');
}
return base * sign;
int sign = 1, base = 0, i = 0;

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