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#include <stdio.h>
#define SIZE 50
int main()
{
FILE *fps=NULL;
fps=fopen("tests.txt","r");
FILE *fpd=NULL;
fpd=fopen("testd.txt","wt+");
fseek(fpd,0,SEEK_END);
char buffer[SIZE];
while (fps || fpd)
{
int t=fread(buffer,sizeof(char),SIZE,fps);
if (t==0)
{
break;
}

for (int i=0;i<t;++i)
{
printf("%s",buffer);
}
fwrite(buffer,sizeof(char),t,fpd);
}
printf("File operater end!\n");


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