C Programming Code Examples C > File Operations Code Examples C Program to Join Lines of Two given Files and Store them in a New file C Program to Join Lines of Two given Files and Store them in a New file #include <stdio.h> #include <stdlib.h> /* Function Prototype */ int joinfiles(FILE *, FILE *, FILE *); char ch; int flag; void main(int argc, char *argv[]) { FILE *file1, *file2, *target; file1 = fopen(argv[1], "r"); if (file1 == NULL) { perror("Error Occured!"); } file2 = fopen(argv[2], "r"); if (file2 == NULL) { perror("Error Occured!"); } target = fopen(argv[3], "a"); if (target == NULL) { perror("Error Occured!"); } joinfiles(file1, file2, target); /* Calling Function */ if (flag == 1) { printf("The files have been successfully concatenated\n"); } } /* Code join the two given files line by line into a new file */ int joinfiles(FILE *file1, FILE *file2, FILE *target) { while ((fgetc(file1) != EOF) || (fgetc(file2) != EOF)) { fseek(file1, -1, 1); while ((ch = fgetc(file1)) != '\n') { if (ch == EOF) { break; } else { fputc(ch, target); } } while ((ch = fgetc(file2)) != '\n') { if (ch == EOF) { break; } else { fputc(ch, target); } } fputc('\n', target); } fclose(file1); fclose(file2); fclose(target); return flag = 1; }
