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#include"stdio.h"
#include"stdlib.h"
void main()
{
char ch,str[20],filename[10];FILE *fp;
int i=0;
printf("enter the file name:\n");
scanf("%s",filename);
if((fp=fopen(filename,"w"))==NULL)
{
printf("cannot open the file\n");
exit(0);
}
ch=getchar();
printf("please enter a sentence:\n");
scanf("%s\n",str);
while(str[i]!='!')
{
if('a' <str[i]&&str[i] <'z') str[i]=str[i]-32;
fputc(str[i],fp);
putchar(str[i]);
i++;
}
fclose(fp);
}
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#include <stdio.h>
int main()
{
int i;
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