Compilare: user.c: In function ‘query’: user.c:6:18: warning: implicit declaration of function ‘t1’ [-Wimplicit-function-declaration] case 1 : t1( q, a, b ); ^ user.c:8:18: warning: implicit declaration of function ‘t2’ [-Wimplicit-function-declaration] case 2 : t2( q, a, b ); ^ user.c:10:18: warning: implicit declaration of function ‘t3’ [-Wimplicit-function-declaration] case 3 : t3( q, a, b ); ^ user.c:13:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:61:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &a, &b, &n ); ^ user.c:63:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &t, &q ); ^