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- void umkehr(FILE *datei1){
- char c='x';
- int i=0;
- char zwischenstring[200+1];
- while(!feof(datei1)){
- c=fgetc(datei1);
- zwischenstring[i]=c;
- if((c>='A')&&(c<='Z'))zwischenstring[i]=c+32;
- if((c>='a')&&(c<='z'))zwischenstring[i]=c-32;
- i++;
- }
- zwischenstring[i+1]=0;
- fprintf(datei1, "%s", zwischenstring);
- fclose(datei1);
- }
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