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Function strtol () in C

The function long int strtol (const char * str, char ** endptr, int base) in Standard C library converts part of the original string in str to a value of long int corresponding to the base base, but must are 2, 8, ., 36, or special value 0.

Declaring the function strtol () in C

Below is the declaration for strtol () in C:

 long int strtol ( const char * str , char ** endptr , int base )

Parameters

str - This is a string representing an integer.

endptr - This is a reference to a allocated object of type char *, whose value is set by the function to the next character in str after the numeric value.

base - This is the base, must be 2, 8, ., 36, or special value 0.

Returns the value

This function returns an integer that has been converted as a long int value. Otherwise, the function returns 0.

For example

The following program C illustrates the usage of the strtol () function in C:

 #include #include int main () { char str [ 30 ] = "21.32301 Hoc C tai QTM" ; char * ptr ; long ret ; ret = strtol ( str , & ptr , 10 ); printf ( "Phan gia tri so (unsigned long int) la: %ldn" , ret ); printf ( "Phan chuoi la: |%s|" , ptr ); return ( 0 ); }

Compile and run the above C program to see the results.

According to Tutorialspoint

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