Compilare: user.c: In function ‘main’: user.c:22:5: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration] exit(0); ^ user.c:22:5: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] user.c:24:1: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] c=(int*)malloc(n*sizeof(int)); ^ user.c:24:9: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] c=(int*)malloc(n*sizeof(int)); ^ user.c:15:23: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] int n,k,q,x,y,z;fscanf(in,"%d",&n); ^ user.c:16:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&k); ^ user.c:17:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&q); ^ user.c:18:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&x); ^ user.c:19:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&y); ^ user.c:20:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&z); ^