Compilare: user.c: In function ‘main’: user.c:48:5: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration] exit(0); ^ user.c:48:5: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] user.c:50:1: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] c=(int*)malloc(n*sizeof(int)); ^ user.c:50:9: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] c=(int*)malloc(n*sizeof(int)); ^ user.c:55:8: warning: unused variable ‘aux’ [-Wunused-variable] int j,aux; ^ user.c:41:23: 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:42:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&k); ^ user.c:43:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&q); ^ user.c:44:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&x); ^ user.c:45:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&y); ^ user.c:46:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&z); ^