如何在C中逐字将内容从一个文件复制到另一个文件？

Question

I know how to copy contents from one file to another character by character, but I am supposed to do it word by word. I tried this code, but when I run this, my output file ends up having each word on a new line. How am I supposed to copy contents from one file to another (as is) word by word?

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char* argv[])
{
    // Error checking
    if(argc < 3)
    {
        fprintf(stderr, "Please print two arguments");
        exit(EXIT_FAILURE);
    }

    char* input = argv[1];
    char* output = argv[2];
    char buffer[4096];

    FILE* fp_open = fopen(input, "r");
    if(fp_open == NULL) fprintf(stderr, "Unable to open input file");

    FILE* fp_write = fopen(output, "w");
    if(fp_write == NULL) fprintf(stderr, "Unable to open output file");

    while(fscanf(fp_open, "%s", buffer) == 1)
    {
        fprintf(fp_write,"%s\n", buffer);
    }

    fclose(fp_open);
    fclose(fp_write);

    return 0;
}

Note: I am only allowed to use fscanf("%s") for reading from an input file.

PS I also know that it is inefficient way to do it, but this is what I am supposed to do.

Answer 1

since the request is to read the string using fscanf only, use the following logic :

char c;
char tmpbuffer[100], buffer[1000];

fp = fopen("file.txt","r");
while(fscanf(fp,"%s",tmpbuffer)!=-1)
{
strcat(buffer,tmpbuffer,strlen(tmpbuffer));
while((c = fgetc(fp)) == " ")
{
strcat(buffer,&c,1);
}
fseek(fp,-1,SEEK_CUR);
}

here the buffer contains the entire string in a line so you can write the entire line into the output file.