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struct Personendaten{
char Vorname;
char Nachname;
int Alter;
int Groesse;
int Gewicht;};
int a;
int b;
int c;
int d;
struct Personendaten Person[20];
for(a=0; a<=20; a++){
scanf ("%s", &Person[a].Vorname);
scanf ("%s", &Person[a].Nachname);
scanf ("%d", &Person[a].Alter);
scanf ("%d", &Person[a].Groesse);
scanf ("%d", &Person[a].Gewicht);
for(c=0; c<=a; c++){
printf("Vorname:");
printf("%d\n", Person[c].Vorname);
printf("Alter:");
printf("%d\n", Person[c].Alter);
printf("Groesse:");
printf("%d\n", Person[c].Groesse);
printf("Gewicht:");
printf("%d\n", Person[c].Gewicht);
}}} 

prog.c:12:1: error: expected identifier or ‘(’ before ‘for’
 for(a=0; a<=20; a++){
 ^~~
prog.c:12:11: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘<=’ token
 for(a=0; a<=20; a++){
           ^~
prog.c:12:18: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘++’ token
 for(a=0; a<=20; a++){
                  ^~
prog.c:27:3: error: expected identifier or ‘(’ before ‘}’ token
 }}}
   ^

Standard output is empty