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File Handling programs of C
Posted Date: 14 Jun 2008 Resource Type: Articles/Knowledge Sharing Category: Computer & Technology
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Posted By: Lenin Member Level: Diamond
Rating:  Points: 1
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File Handling programs
This section contains programs demonstrating file handling and command
line arguments.
The following program reads a text file and counts how many times each
letter from 'A' to 'Z' occurs and displays the results.
#include
#include
#include
int count[26];
void main(int argc, char *argv[])
{
FILE *fp;
char ch;
int i;
/* see if file name is specified */
if (argc!=2) {
printf("File name missing");
exit(1);
}
if ((fp= fopen(agv[1], "r")) == NULL) {
printf("cannot open file");
exit(1);
}
while ((ch=fgetchar(fp)) !=EOF) {
ch = toupper(ch);
if (ch>='A' && ch<='Z') count[ch-'A']++;
}
for (i=0; i<26; i++)
printf("%c occurred %d times\n", i+'A', count[i]);
fclose(fp);
}
This program uses command line arguments to read and display the
contents of a file supplied as an argument.
#include
#define CLEARS 12 /* constant */
main(int argc , char *argv[])
{
FILE *fp , *fopen();
int c;
putchar(CLEARS);
while ( --argc > 0 )
if ((fp=fopen(argv[1], "r"))==NULL)
{
printf("I can't open %s\n", argv[1]);
break;
}
else
{
while ((c= getc(fp)) !=EOF)
putc(c,stdout); /* display to the screen */
fclose(fp);
}
}
This program gives a further example of the use of argc & argv
#include
#include
main(int argc , char *argv[])
{
double a , b;
if (argc != 3) {
printf("Usage: add number number ...\n");
exit(1);
}
a = atof(argv[1]);
b = atof(argv[2]);
printf("%lf\n" , a + b);
}
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