Compilare: user.c: In function ‘calculeaza’: user.c:8:5: warning: implicit declaration of function ‘fabs’ [-Wimplicit-function-declaration] if(A==0) return fabs(Y-(double)1/B); ^ user.c:8:21: warning: incompatible implicit declaration of built-in function ‘fabs’ [enabled by default] if(A==0) return fabs(Y-(double)1/B); ^ user.c:9:21: warning: incompatible implicit declaration of built-in function ‘fabs’ [enabled by default] if(B==0) return fabs(X-(double)1/A); ^ user.c:11:8: warning: incompatible implicit declaration of built-in function ‘fabs’ [enabled by default] if(fabs(X-(double)(1-B*Y)/A)<fabs(Y-(double)(1-A*X)/B)) return fabs(X-(double)(1-B*Y)/A); ^ user.c: In function ‘main’: user.c:21:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.c:25:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d",&A,&B,&X,&Y); ^