Here is source code of the C Program to capitalize first letter of every word in a file. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

/*
* C Program to Capitalize First Letter of every Word in a File
*/
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
int to_initcap_file(FILE *);

void main(int argc, char * argv[])
{
FILE *fp1;
char fp[10];
int p;

fp1 = fopen(argv[1], "r+");
if (fp1 == NULL)
{
printf("cannot open the file ");
exit(0);
}
p = to_initcap_file(fp1);
if (p == 1)
{
printf("success");
}
else
{
printf("failure");
}
fclose(fp1);
}

/* capitalizes first letter of every word */
int to_initcap_file(FILE *fp)
{
char c;

c = fgetc(fp);
if (c >= 'a' && c <= 'z')
{
fseek(fp, -1L, 1);
fputc(c - 32, fp);
}
while(c != EOF)
{
if (c == ' ' || c == '\n')
{
c = fgetc(fp);
if (c >= 'a' && c <= 'z')
{
fseek(fp, -1L, 1);
fputc(c - 32, fp);
}
}
else
{
c = fgetc(fp);
}
}
return 1;
}



$ cc file5.c
$ a.out sample
success
$ cat sample
Wipro Technologies
File Copy Function
Successfully Read