Compilare: user.c: In function ‘main’: user.c:31:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%10==2) ^ user.c:39:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%10==3) ^ user.c:47:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%10==4) ^ user.c:53:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%10==7) ^ user.c:61:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%10==8) ^ user.c:69:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%10==9) ^ user.c:8:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.in","r",stdin); ^ user.c:9:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.out","w",stdout); ^ user.c:10:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^