C語言中，編程實現將文本文件file1.dat中的內容復制到文本文件file2.dat中去，同時將小寫字母轉換成大寫字

#include <stdlib.h>

void main()

{

FILE *in,*out;

char ch;

if((in=fopen("file1.dat","r+"))==NULL)

{

printf("can,t open thie file!");

exit(0);

}

if((out=fopen("file2.dat","w+"))==NULL)

{

printf("can,t open thie file!");

exit(0);

}

while(!feof(in))

{

ch=fgetc(in);

char ch1=ch+'A'-'a';

fputc(ch1,out);//從infile中取入字符放到outfile文件中去

}

while(!feof(out))

{

ch=fgetc(out);

putchar(ch);

out++;

}

fclose(in);

fclose(out);

}