PASS Week 14 Solutions

PROBLEM #1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

struct CAR{

    char brand[20];
    int vin;

};

void loadArray(struct CAR[], int);
void printArray(struct CAR[], int);

int main(){

    srand(time(NULL));

    int arrayLength = 4;
    struct CAR newCar[arrayLength];

    loadArray(newCar, arrayLength);
    printArray(newCar, arrayLength);

    return 0;
}

void loadArray(struct CAR ary[], int length){
    for (int i = 0; i < length; i++){
        printf("Enter in a brand name for car %d: ", i + 1);
        scanf("%s", ary[i].brand);
        ary[i].vin = rand() % 9000 + 1000;
    }
    printf("\n");
    return;
}

void printArray(struct CAR ary[], int length){
    for (int i = 0; i < length; i++){
        printf("The brand name of car %d is %s.\n", i + 1, ary[i].brand);
        printf("The vehicle ID number of car %d is %d. \n", i + 1, ary[i].vin);
    }
    return;
}










PROBLEM #1 Challenge (Only loadArray needs to be modified):

void loadArray(CAR ary[], int length){
    for (int i = 0; i < length; i++){
        printf("Enter in a brand name for car %d: ", i + 1);
        scanf("%s", ary[i].brand);
        ary[i].vin = rand() % 9000 + 1000;
        for (int j = 0; j < length; j++){
            if (ary[i].vin == ary[j].vin){
                ary[i].vin = rand() % 9000 + 1000;
            }
        }
    }
    printf("\n");
    return;
}




















PROBLEM #2

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

typedef struct CAR{

    char brand[20];
    int vin;

} CAR;

void loadArray(CAR[], int);
void printArray(CAR[], int);

int main(){

    srand(time(NULL));

    int arrayLength = 4;
    CAR newCar[arrayLength];

    loadArray(newCar, arrayLength);
    printArray(newCar, arrayLength);

    return 0;
}

void loadArray(CAR ary[], int length){
    for (int i = 0; i < length; i++){
        printf("Enter in a brand name for car %d: ", i + 1);
        scanf("%s", ary[i].brand);
        ary[i].vin = rand() % 9000 + 1000;
    }
    printf("\n");
    return;
}

void printArray(CAR ary[], int length){
    for (int i = 0; i < length; i++){
        printf("The brand name of car %d is %s.\n", i + 1, ary[i].brand);
        printf("The vehicle ID number of car %d is %d. \n", i + 1, ary[i].vin);
    }
    return;
}















PROBLEM #3

#include <stdio.h>
#include <math.h>
typedef struct{
int x;
int y;
int res;
} SAMPLE;

void PowerUp(SAMPLE*);
void PowerUpWrong(SAMPLE);

int main(void) {
    SAMPLE sample1 = {2, 5, 0}; //Initializes fields/members
    SAMPLE* samplePtr;
    samplePtr = &sample1; //Create a pointer to the struct

    PowerUpWrong(sample1);
    printf("The incorrect result is %d\n", sample1.res);

    PowerUp(samplePtr);
    printf("%d raised to the power of %d is: %d\n", sample1.x, samplePtr->y, sample1.res);
    //Note the use of both the indirect and direct selection operators

    return 0;
}

void PowerUpWrong(SAMPLE ptr){
    int result = 0;
    ptr.res = (int)pow(ptr.x, ptr.y);

    return;
}

void PowerUp(SAMPLE* smp){
    int result = 0;
    result = (int)pow(smp->x, smp->y);
    smp->res = result;

    return;
}

















PROBLEM #4

#include <stdio.h>

#define N 4 //Size of vectors
typedef double SCALAR;
typedef SCALAR VECTOR[N];
SCALAR Dot_Product(VECTOR x, VECTOR y) {
  int i;
  SCALAR sum = 0.0;
  for (i = 0; i < N; i++) {
    sum += x[i] * y[i];
  }
  return sum;
}
void Print_Vector(VECTOR T, int sz) {
  int i;
  printf("The vector: ");
  for (i = 0; i < sz; i++) {
    printf(" %lf ", T[i]);
  }
  printf("\n");
  return;
}
int main(void) {
  SCALAR dProduct = 0.0;
  VECTOR x = {
    2,
    5.4,
    6,
    9
  };
  VECTOR y = {
    4.2,
    5.4,
    6.7,
    7
  };
  Print_Vector(x, N);
  Print_Vector(y, N);
  dProduct = Dot_Product(x, y);
  printf("The Dot Product of X and Y is: %10.2lf\n", dProduct);
  return 0;
}