stdlib.c

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int
atoi(const char *nptr)
{
    int i = 0;
    int val = 0;
 
    while (nptr[i] != '\0') {
        if (nptr[i] >= '0' && nptr[i] <= '9') {
            val = val * 10 + (int)(nptr[i] - '0');
        } else {
            return 0;
        }
        i++;
    }
 
    return val;
}