c - How to add line numbers to the lines of existing file -


i need add line numbers each line of existitng file. idea read file1 add line number each line ,store in separate variable , write in file2.

here code.

reading:

static char buff[100]; int linenum = 0; file *fp = fopen ("file1", "r");      while (fgets (buff, sizeof (buff), fp) != null) {     printf ("%7d: %s %s ", ++linenum, buff);    } fclose (fp);

saving :

i need store results above in " str " can written file2

file *fp2 = fopen ("file2", "w"); fwrite(str , 1 , sizeof(str) , fp2 ); fclose(fp2);

please give clear scenario, whatever understand use following sample code reference:

#include <stdio.h>  #define max_line    1024  int main() {     file    *infile     = null,             *outfile    = null;      char    lcharbuff[max_line];      int     llinenum = 1;      infile  = fopen("main.c","r");     outfile = fopen("out.txt","w");       if(!infile || !outfile)     {         printf("unable open file\n");         return 0;     }      while(fgets(lcharbuff,max_line,infile) != null)     {         fprintf(outfile,"%10d %s",llinenum,lcharbuff);         llinenum++;     }      fclose(infile);     fclose(outfile);      return 0; }

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