atoi - convert a string to an int
atoi, atol, atoll - convert a string to an integer
#include <stdlib.h>
int atoi(string s);
#include <stdlib.h>
int atoi(const char *nptr);
long atol(const char *nptr);
long long atoll(const char *nptr);Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
This function converts a (positive or negative) integer from a string (e.g., "50") to an int (e.g., 50).
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);except that atoi() does not detect errors.
The atol() and atoll() functions
behave the same as atoi(), except that they convert the
initial portion of the string to their return type of long or
long long.
This function returns its input, s, as an int.
The converted value or 0 on error.
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
printf("This is CS%i\n", atoi("50"));
}