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OpenBSD manual page server ; DESCRIPTION. The atoi () function converts the initial portion of the string pointed to by nptr to integer representation. The atoi() function is subsumed by strtol() but is retained because it is used extensively in existing code. If the number is not known to be in range, strtol() ATOI. Section: POSIX Programmer's Manual (P) Updated: 2003. NAME. atoi - convert a string to an integer #include . int atoi(const char *str); DESCRIPTION. The atoi() function converts the initial portion of the string pointed to by nptr to int. The behavior is the same as. strtol( FreeBSD Manual Pages · -- convert ASCII string to integer LIBRARY Standard C Library (libc, -lc) SYNOPSIS · < · > int · (const char *nptr); DESCRIPTION The · ()Manual Pages — ATOI. NAME. atoi – convert ASCII string to integer The atoi() function converts the initial portion of the string pointed to by nptr to The atoi() function converts the initial portion of the string pointed to by nptr to int. The behavior is the same as strtol(nptr, NULL, 10); Manual pages are a command-line technology for providing documentation. ATOI(3) BSD Library Functions Manual ATOI(3) NAME atoi, atoi_l -- convert ASCII