Compilare: user.c: In function ‘main’: user.c:18:3: warning: implicit declaration of function ‘strcat’ [-Wimplicit-function-declaration] strcat(op,"1"); ^ user.c:18:3: warning: incompatible implicit declaration of built-in function ‘strcat’ [enabled by default] user.c:61:3: warning: incompatible implicit declaration of built-in function ‘strcat’ [enabled by default] strcat(op,"2"); ^ user.c:8:74: warning: unused variable ‘aux’ [-Wunused-variable] int n, v[MAX], operatii = 0, ok = 1, m = MIN, cap = MIN-1, coada = MIN, aux; ^ user.c:12:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&n); ^ user.c:16:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ",&v[m]); ^