Compilare: user.c: In function ‘main’: user.c:20:3: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (a=1) {a--;} ^ user.c:22:2: warning: implicit declaration of function ‘putw’ [-Wimplicit-function-declaration] putw(a,fp); ^ user.c:9:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%d\n%d",&a,&b); ^