Convert string to integer
#include <inttypes.h> intmax_t strtoimax(const char *nptr, char **endptr, int base); uintmax_t strtoumax(const char *nptr, char **endptr, int base);
On success, the converted value is returned. If nothing was found to convert, zero is returned. On overflow or underflow INTMAX_MAX or INTMAX_MIN or UINTMAX_MAX is returned, and errno is set to ERANGE.
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