Question

How to copy data from one file to another in c lang?

Answer 1

The easy-cheesy way
So if u think its wrong than v.sorry but it correct


C program to copy contents of one file to another file

#include <stdio.h> #include <stdlib.h> // For exit() int main() { FILE *fptr1, *fptr2; char filename[100], c; printf("Enter the filename to open for reading \n"); scanf("%s", filename); // Open one file for reading fptr1 = fopen(filename, "r"); if (fptr1 == NULL) { printf("Cannot open file %s \n", filename); exit(0); } printf("Enter the filename to open for writing \n"); scanf("%s", filename); // Open another file for writing fptr2 = fopen(filename, "w"); if (fptr2 == NULL) { printf("Cannot open file %s \n", filename); exit(0); } // Read contents from file c = fgetc(fptr1); while (c != EOF) { fputc(c, fptr2); c = fgetc(fptr1); } printf("\nContents copied to %s", filename); fclose(fptr1); fclose(fptr2); return 0; }

Output:

Enter the filename to open for reading a.txt Enter the filename to open for writing b.txt Contents copied to b.txt

Polite ans.
thank u