get file contents by c languige

To read the contents of a file in C language, you can use the following code:

#include <stdio.h>

int main() {
   FILE *fp;
   char ch;

   // Open file
   fp = fopen("filename.txt", "r");

   // Check if file exists
   if (fp == NULL) {
      printf("Cannot open file \n");
      return 1;
   }

   // Read contents from file
   while ((ch = fgetc(fp)) != EOF) {
      printf("%c", ch);
   }

   // Close file
   fclose(fp);

   return 0;
}

In the above code, replace `filename.txt` with the name of the file you want to read. The `fopen` function opens the file in read mode, and the `fgetc` function reads each character of the file until the end of file (EOF) is reached. The `fclose` function closes the file.