Eroare de compilare: user.c:1: warning: return type defaults to 'int' user.c: In function 'main': user.c:1: error: 'a' undeclared (first use in this function) user.c:1: error: (Each undeclared identifier is reported only once user.c:1: error: for each function it appears in.) user.c:1: error: 'b' undeclared (first use in this function) user.c:1: warning: left-hand operand of comma expression has no effect user.c:1: warning: implicit declaration of function 'fscanf' user.c:1: warning: incompatible implicit declaration of built-in function 'fscanf' user.c:1: warning: implicit declaration of function 'fopen' user.c:1: warning: passing argument 1 of 'fscanf' makes pointer from integer without a cast user.c:1: warning: implicit declaration of function 'fprintf' user.c:1: warning: incompatible implicit declaration of built-in function 'fprintf' user.c:1: warning: passing argument 1 of 'fprintf' makes pointer from integer without a cast user.c:1:110: warning: no newline at end of file