Compilare: user.c: In function ‘HugeMultiply’: user.c:21:1: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(C, 0, sizeof(C)); ^ user.c:21:1: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:31:1: warning: implicit declaration of function ‘memcpy’ [-Wimplicit-function-declaration] memcpy(A, C, sizeof(C)); ^ user.c:31:1: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default] user.c: In function ‘main’: user.c:42:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^ user.c: In function ‘HugeMultiply’: user.c:28:6: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i + j - 2 > C[0]){ ^