Writing Data Into A File using C.

Writing Data Into A File

We can write data into a file. The following is the algorithm for writing data:
Create a file using fopen() function
Write data into a file using fprintf() and fputs() functions
Close a file using fclose() function
For testing, we create data into a file, demo.txt. For implementation, create a file, called
filewrite.c, and write this code.


#include <stdio.h>
int main(int argc, const char* argv[]) {
int i;
FILE *f;

f = fopen("demo.txt", "w+");
 
for(i=0;i<5;i++){
   fprintf(f, "fprintf message %d\n",i);
   fputs("fputs message\n", f); // no format
}

fclose(f);
printf("Data was written into a file\n");

return 0;
}
Save this code. Compile and run this program.