Write a Program that Merges Lines Alternatively from 2 Files & Print Result.
C Program
#include <stdio.h>
int main()
{
FILE *file1, *file2, *mergeFile;
char fileName1[1000];
char fileName2[1000];
char mergeFileName[1000];
char c1;
char c2;
printf("Enter first file name with full path: ");
scanf("%s", fileName1);
printf("Enter second file name with full path: ");
scanf("%s", fileName2);
printf("Enter merge file name with full path: ");
scanf("%s", mergeFileName);
//open files in read mode
file1 = fopen(fileName1, "r");
file2 = fopen(fileName2, "r");
if (file1 == NULL || file2 == NULL)
{
printf("Error in opening file \n");
return -1;
}
//open file in write mode
mergeFile = fopen(mergeFileName, "w");
if (mergeFile != NULL)
{
printf("File created successfully!\n");
}
else
{
printf("Failed to create the file.\n");
return -1;
}
char line[1000];
c1 = fgetc(file1);
c2 = fgetc(file2);
int c = 0;
//iterate till both we reach
//end of any file
while (c1 != EOF && c2 != EOF)
{
if (c1 != EOF)
{
ungetc(c1, file1);
fgets(line, 1000, file1);
fputs(line, mergeFile);
c1 = fgetc(file1);
}
//put new line
if (c1 == EOF)
{
putc('\n', mergeFile);
}
if (c2 != EOF)
{
ungetc(c2, file2);
fgets(line, 1000, file2);
fputs(line, mergeFile);
c2 = fgetc(file2);
}
//put new line
if (c2 == EOF)
{
putc('\n', mergeFile);
}
}
//if first file remaining
while (c1 != EOF)
{
ungetc(c1, file1);
fgets(line, 1000, file1);
fputs(line, mergeFile);
c1 = fgetc(file1);
}
//if second file remaining
while (c2 != EOF)
{
ungetc(c2, file2);
fgets(line, 1000, file2);
fputs(line, mergeFile);
c2 = fgetc(file2);
}
//close files
fclose(file1);
fclose(file2);
fclose(mergeFile);
return 0;
}
Input:
Enter first file name with full path: C:\Users\hello.txt
Enter second file name with full path: C:\Users\studentrecord.txt
Enter merge file name with full path: C:\Users\merge.txt
Output:
File created successfully!
Input File: hello.txt
1
2
3
4
5
Input File:studentrecord.txt
Ram Singh
Rahul
Raju
Singh
Output File: merge.txt
1
Ram Singh
2
Rahul
3
Raju
4
Singh
5
