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#include <stdio.h>
 
/*      Factorial 5! = 5*4*3*2*1      */
 
main ()
{
    int Wert;
    int fak = 1;
 
    scanf ("%d", Wert);
 
    while ( Wert > fak) {
        fak = fak * Wert;
        Wert = Wert - 1;
        printf ("%d", fak);
    }
}

prog.c:5:1: error: return type defaults to ‘int’ [-Werror=implicit-int]
 main ()
 ^~~~
prog.c: In function ‘main’:
prog.c:10:14: error: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘int’ [-Werror=format=]
     scanf ("%d", Wert);
              ^
prog.c:10:5: error: ‘Wert’ is used uninitialized in this function [-Werror=uninitialized]
     scanf ("%d", Wert);
     ^~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Standard output is empty