C library functions - strtol ()
C standard library - <stdlib.h>
description
C library functionslong int strtol (const char * str , char ** endptr, int base) the argument strpoints to the string according to the givenbaseis converted to a long integer (type long int type), base must be between between 2 and 36 (inclusive), or the special value 0.
statement
The following is a statement strtol () function.
long int strtol(const char *str, char **endptr, int base)
parameter
- str - a string to be converted to a long integer.
- A reference to an object of type char *, and its value is set by the function valuein str after the next character -endptr.
- base - base must be between 2 and 36 (inclusive), or the special value 0.
return value
This function returns the converted long integer if there is no implementation of an effective conversion, it returns a value of zero.
Examples
The following example demonstrates the strtol () function is used.
#include <stdio.h>
#include <stdlib.h>
int main()
{
char str[30] = "2030300 This is test";
char *ptr;
long ret;
ret = strtol(str, &ptr, 10);
printf("数字（无符号长整数）是 %ld\n", ret);
printf("字符串部分是 |%s|", ptr);
return(0);
}
Let's compile and run the above program, which will result in the following:
数字（无符号长整数）是 2030300 字符串部分是 | This is test|