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Programs on Files
Posted Date: 17 Jan 2008 Resource Type: Articles/Knowledge Sharing Category: Computer & Technology
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Posted By: Sagaya James Immanuel Member Level: Bronze
Rating:  Points: 5
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1) /* Reverse a file(Reversing string by string) */
# include
# include
int i,j,k;
FILE *fp;
FILE *pf;
char ch;
char string[81];
char string1[81];
main(int argc, char *argv[])
{
if (argc < 2)
{
printf("Incorrect Format");
getch();
exit(1);
}
if ( (fp = fopen(argv[1], "r")) == NULL)
{
printf("%s Cannot Be Opened ", argv[1]);
getch();
exit(1);
}
if ( (pf = fopen(argv[2], "w")) == NULL)
{
printf("%s Cannot Be Opened ", argv[2]);
getch();
exit(1);
}
clrscr();
while (fgets(string,80,fp) != NULL)
fputs(strrev(string), pf);
}
--------------------------------------------------------------------------------
2) /* Reverse the contents of a file(Charater by character using recursion) */
/*Program to Reverse the entire content of the file.*/
#include
#include
void main()
{
FILE *fp;
clrscr();
fflush(stdin);
fp = fopen("Memory.txt","r");
if(fp == NULL)
{
printf("\nCannot open the File");
}
else
{
if(fp)
{
rev(fp);
}
}
getch();
}
void rev(FILE *fp)
{
char c;
if ((c=fgetc(fp) != EOF)
{
rev(fp);
putchar(c);
}
}
--------------------------------------------------------------------------------
3) /* Counting number of words in a file */
#include
#include
void main(int argc, char *argv[])
{
FILE *fp;
char ch, string[81];
int white = 1;
int count = 0;
if (argc != 2)
{
printf("Format : file5 ");
exit(1);
}
if ( (fp = fopen(argv[1], "r")) == NULL)
{
printf("Cannot open file %s", argv[1]);
exit(1);
}
while ((ch=getc(fp)) != EOF)
{
switch(ch)
{
case ' ':
case '\t':
case '\n':
white++;
break;
default :
if (white)
{
white = 0;
count ++;
}
}
}
fclose(fp);
printf("File %s contains %d words", argv[1], count);
}
--------------------------------------------------------------------------------
4) /* Reading a file */
#include
#include
int main(int argc, char *argv[])
{
FILE *fp;
char string[81];
if (argc != 2)
{
printf("Format : file8 filename");
exit(1);
}
if ( (fp=fopen(argv[1], "r")) == NULL)
{
printf("Cannot open file %s ", argv[1]);
exit(1);
}
while (fgets(string,80,fp) != NULL)
printf("%s", string);
fclose(fp);
return(0);
}
--------------------------------------------------------------------------------
5) /* Writing a file */
#include
#include
void main()
{
int table[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
FILE *fp;
if ( (fp=fopen("table.rec", "w")) == NULL)
{
printf("Cannot open agents.rec");
exit(1);
}
fwrite(table, sizeof(table), 1, fp);
fclose(fp);
}
--------------------------------------------------------------------------------
6) /* Copy a file */
#include
int main()
{
FILE *in, *out;
int key;
if ((in = fopen("junk.txt", "r")) == NULL)
{
puts("Unable to open the file");
return 0;
}
out = fopen("copy.txt", "w");
while (!feof(in))
{
key = fgetc(in);
if (!feof(in))
fputc(key, out);
}
fclose(in);
fclose(out);
return 0;
}
--------------------------------------------------------------------------------
7) /* Database using files (structure and files) */
#include
#include
void main()
{
struct student
{
int roll;
char name[40];
} stu;
char numstr[81];
FILE *fp;
int recno;
long int offset;
if ( (fp=fopen("agents.rec", "r")) == NULL)
{
printf("Cannot open agents.rec");
exit(1);
}
printf("Enter record number : ");
scanf("%d", &recno);
offset = (recno - 1) * sizeof(stu);
if (fseek(fp, offset, 0) != 0)
{
printf("Cannot move pointer ");
exit(1);
}
fread(&stu, sizeof(stu), 1, fp);
printf("Roll Number %d\n", stu.roll);
printf("Name %s\n", stu.name);
fclose(fp);
}
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