Compilare: user.c: In function ‘HugeMultiply’: user.c:34:1: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(C, 0, sizeof(C)); ^ user.c:34:1: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:44:1: warning: implicit declaration of function ‘memcpy’ [-Wimplicit-function-declaration] memcpy(A, C, sizeof(C)); ^ user.c:44:1: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default] user.c: In function ‘main’: user.c:69:1: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] N[0] = strlen(stringN); ^ user.c:69:8: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] N[0] = strlen(stringN); ^ user.c:66:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%s", stringN); ^ user.c:67:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%s", stringC); ^