file related

[cool.qwerty]

how we create multiple file with diffrent name in c program?

 

[Richard Heathfield]

(e-mail address removed) said:

how we create multiple file with diffrent name in c program?

See K&R2 pp160-162

 

[pete]

how we create multiple file with diffrent name in c program?

/* BEGIN new.c */

#include <stdio.h>
#include <stdlib.h>

#define NFILES 3
#define MAX_LINES_PER_FILE 15
#define LU_RAND_SEED 0LU
#define LU_RAND(S) ((S) * 69069 + 362437 & 0XFFFFFFFFLU)
#define NMEMB(A) (sizeof (A) / sizeof *(A))

void fremove(char (*fn)[L_tmpnam], size_t nmemb);

int main(void)
{
long unsigned index, lu_seed, line;
int rc;
char fn[NFILES][L_tmpnam];
FILE *fp;

puts("/* BEGIN new.c output */\n");
/*
** Open temporary input text files for writing.
** Close each file after filling with long unsigned values.
*/
lu_seed = LU_RAND_SEED;
for (index = 0; index != NMEMB(fn); ++index) {
tmpnam(fn[index]);
fp = fopen(fn[index], "w");
if (fp == NULL) {
fremove(fn, index);
puts("fopen(fn[index], \"w\") == NULL");
exit(EXIT_FAILURE);
}
printf("\"%s\" open for writing.\n", fn[index]);
line = lu_seed % MAX_LINES_PER_FILE + 1;
while (line-- != 0) {
lu_seed = LU_RAND(lu_seed);
fprintf(fp, "%lu\n", lu_seed);
printf( "%lu\n", lu_seed);
}
fclose(fp);
printf("\"%s\" closed.\n\n", fn[index]);
}
/*
** Open input text files for reading.
** Close each temp input file after reading.
** Remove temporary input files.
*/
for (index = 0; index != NMEMB(fn); ++index) {
fp = fopen(fn[index], "r");
if (fp == NULL) {
fremove(fn, NMEMB(fn));
puts("fopen(fn[index], \"r\") == NULL");
exit(EXIT_FAILURE);
}
printf("\"%s\" open for reading.\n", fn[index]);
while ((rc = getc(fp)) != EOF) {
putchar(rc);
}
fclose(fp);
printf("\"%s\" closed.\n\n", fn[index]);
}
fremove(fn, NMEMB(fn));
puts("\n/* END new.c output */");
return 0;
}

void fremove(char (*fn)[L_tmpnam], size_t nmemb)
{
while (nmemb-- != 0) {
if (remove(fn[nmemb]) == 0) {
printf("\"%s\" removed.\n", fn[nmemb]);
}
}
}

/* END new.c */

 

[santosh]

how we create multiple file with diffrent name in c program?

Your question is not clear. There are many possibilities. One of them
involves adding a variable prefix or suffix to a chosen name. Another
possibility is to use tmpfile() function to open unique files.

If you describe the exact context of your problem we may be able to
suggest better solutions.