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Victor
Main function parameter in C language
1 Answer(s)      4 years and 8 months ago
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December 4, 2009 at 1:01 PM


Hi Friend,

int main(int argc, char **argv)

The main function serves as the starting point for program execution. It usually controls program execution by directing the calls to other functions in the program. A program usually stops executing at the end of main, although it can terminate at other points in the program.The parameters argc, argument count, and argv, argument vector[1], respectively give the number and value of the program's command-line arguments.

The fgetpos function gets the current value of the stream argument?s file-position indicator and stores it in the object pointed to by pos. The fsetpos function can later use information stored in pos to reset the stream argument?s pointer to its position at the time fgetpos was called.


Here is an example of fsetpos();

#include <stdio.h>

int main (){
FILE * pFile;
fpos_t position;

pFile = fopen ("myfile.txt","w");
fgetpos (pFile, &position);
fputs ("That is an example of fsetpos() function",pFile);
fsetpos (pFile, &position);
fputs ("This",pFile);
fclose (pFile);
return 0;
}

Here is an example of fgetpos():

#include <stdio.h>
#include <conio.h>
int main ()
{
FILE * pFile;
int c;
int n;
fpos_t pos;

pFile = fopen ("myfile.txt","r");
if (pFile==NULL) perror ("Error opening file");
else
{
c = fgetc (pFile);
printf ("1st character is %c\n",c);
fgetpos (pFile,&pos);
fsetpos (pFile,&pos);
c = fgetc (pFile);
printf ("2nd character is %c\n",c);

fclose (pFile);
}
getch();
return 0;

}
Thanks


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