C :

#include<stdio.h>
#define N 80 
int copyfile (const char *srcName,const char *dstName);
int main()  
{
char srcFilename[N]	;
char dstFilename[N];
scanf("%s",srcFilename );
scanf("%s",dstFilename);
if(copyfile(srcFilename,dstFilename)) printf("Copy succeed!\n");
else 
printf("Copy failed!\n");
return 0;
}
int copyfile(const char *srcName,const char *dstName)
{
	FILE *fpSrc=NULL,*fpDst=NULL;
	int ch,rval=1;
	if((fpSrc=fopen(srcName,"r"))==NULL) goto ERROR;
	if((fpDst=fopen(dstName,"w"))==NULL) goto ERROR;
	while((ch=fgetc(fpSrc))!=EOF)
	{
	if(fputc(ch,fpDst)==EOF) goto ERROR;	
	}
	fflush(fpDst);
	goto EXIT;
	ERROR:
		rval=0;
		EXIT:
			if(fpSrc!=NULL)fclose(fpSrc);
			if(fpDst!=NULL)fclose(fpDst);
			return rval;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int main()
{
    char in[100];
    char out[100];
    char ch;
    cin>>in>>out;
    FILE *p1;
    FILE *p2;
    if((p1=fopen(in,"r"))==NULL)
    {
        cout<<"Copy failed!";
        return 0;
    }
    if((p2=fopen(out,"w"))==NULL)
    {
        cout<<"Copy failed!";
        return 0;
    }
    while(!feof(p1))
    {
        ch=fgetc(p1);
        fputc(ch,p2);
    }
    fclose(p1);
    fclose(p2);
    cout<<"Copy succeed!";
}