int main(void)
{
FILE *src,*dst;
int ch; //ﾊﾞｯﾌｧ用の変数はcharではだめ
if(ac != 3){
printf("usage: %s src dst\n",av[0]);
return 1;
}
if((src=fopen(av[1],"rb"))==NULL){
printf("can't open %s\n",av[1]);
return 1;
}
if((dst=fopen(av[2],"wb"))==NULL){
printf("can't open %s\n",av[2]);
return 1;
}
while((ch=fgetc(src)) != EOF){
if(ch == '\n') //整数より文字定数
　putc('\r',dst);
　putc(ch,dst);
}
fclose(src);
fclose(dst);
return 0;
}