Compilare: user.c:13:23: warning: return type defaults to ‘int’ [enabled by default] FILE*ifl__;FILE*ofl__;filread(char*ft,...){va_list ap;va_start ^ user.c:29:37: warning: return type defaults to ‘int’ [enabled by default] (ap);return 1;}va_end(ap);return 0;}filwrite(char*ft,...) ^ user.c: In function ‘filwrite’: user.c:32:49: warning: assignment makes pointer from integer without a cast [enabled by default] (ap,char*);fputs((char*)p,ofl__);break;case'd':p=va_arg ^ user.c: In function ‘sumup’: user.c:48:24: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] !!(nk&1<<j)^!!(mk&1<<i)+1));return sum;}main(){bothopen ^ user.c: At top level: user.c:48:41: warning: return type defaults to ‘int’ [enabled by default] !!(nk&1<<j)^!!(mk&1<<i)+1));return sum;}main(){bothopen ^ user.c: In function ‘filread’: user.c:16:1: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] ((char*)p,INT_MAX,ifl__);break;case'l':p=va_arg(ap,long ^ user.c:17:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] int*);fscanf(ifl__,"%ld\n",(long int*)p);break;case'L':p=va_arg ^ user.c:18:27: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] (ap,long long int*);fscanf(ifl__,"%lld\n",(long long ^ user.c:19:47: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] int*)p);break;case'd':p=va_arg(ap,int*);fscanf(ifl__,"%d\n", ^ user.c:21:42: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] (p=va_arg(ap,int*);i--;p=(int*)p+1)fscanf(ifl__,i?"%d ":"%d\n", ^ user.c:23:22: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] (long int*)p+1)fscanf(ifl__,i?"%ld ":"%ld\n",(long int*)p);else ^ user.c:25:16: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] int*)p+1)fscanf(ifl__,i?"%lld ":"%lld\n",(long long ^