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#include <stdio.h>
 
int main(void) {
 
	int n,n2;
 
	n=4562;
 
	n2=n;
 
	int l:
 
	l=0;
 
	while(n>0){
 
 
		n=n/10;
 
 
		}
 
	printf("%d",l);
 
 
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:11:7: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘:’ token
  int l:
       ^
prog.c:11:7: error: expected expression before ‘:’ token
prog.c:23:14: error: ‘l’ undeclared (first use in this function)
  printf("%d",l);
              ^
prog.c:23:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:5:8: warning: variable ‘n2’ set but not used [-Wunused-but-set-variable]
  int n,n2;
        ^~

Standard output is empty