#define VECTOR_LENGTH 255
#define MAX_RAD 15
#define MAX_ANGLE 15
double FR[MAX_RAD][MAX_ANGLE];
double FI[MAX_RAD][MAX_ANGLE];
condition a
memset(FR,0x00, sizeof(FR)); //initialization
memset(FI,0x00, sizeof(FI) );
condition b
memset(FR,0x00, sizeof(double) * VECTOR_LENGTH); //initialization
memset(FI,0x00, sizeof(double)*...