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#include <stdio.h>
#include <string.h>
#include <ctype.h>
 
int main()
{
  char s[101], us[101];
  int t, i, cn;
 
  scanf("%d", &t);
 
  s[0]=us[0]='\0';
 
  cn=0;
  while(cn<=t) {
    gets(s);
    cn++;
 
    printf("Case %d: ", cn);
 
    i=0;
    while(s[i]) {
      us[i]=toupper(s[i]);
      i++;
    }
    us[i]='\0';
    printf("%s\n" us);
  }
}

prog.c: In function 'main':
prog.c:16:5: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration]
     gets(s);
     ^
prog.c:27:19: error: expected ')' before 'us'
     printf("%s\n" us);
                   ^
prog.c:27:12: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
     printf("%s\n" us);
            ^

Standard output is empty