module7-9.cpp

#include <iostream>

void banner();
void m7_t1();
void m7_t2();
void m7_t3();

void m8_t1();
void m8_t2();
void m8_t3();

void m9_t1();
void m9_t2();
void m9_t3();

void show_task(int m, int t);

int main()
{
    int m, t;
    banner();
    m = 9;
    t = 3;
    show_task(m, t);
}

void banner() {
    printf("\n*************************************************************************");
    printf("\nInderpreet Sing,     Section 003,     320098199");
    printf("\n*************************************************************************");
}

void show_task(int m, int t) {
    switch (m)
    {
    case 7:
        switch (t) {
        case 1:
            m7_t1();
            break;
        case 2:
            m7_t2();
            break;
        case 3:
            m7_t3();
            break;
        default:
            printf("\nInvalid task number");
        }
        break;
    case 8:
        switch (t) {
        case 1:
            m8_t1();
            break;
        case 2:
            m8_t2();
            break;
        case 3:
            m8_t3();
            break;
        default:
            printf("\nInvalid task number");
        }
        break;
    case 9:
        switch (t) {
        case 1:
            m9_t1();
            break;
        case 2:
            m9_t2();
            break;
        case 3:
            m9_t3();
            break;
        default:
            printf("\nInvalid task number");
        }
        break;
    default:
        printf("\nInvalid Module");
        break;
    }
}

void m7_t1() {
    int a[5] = { 1, 2, 3, 4, 5 };
    int b[5] = { 10, 20, 30, 40, 50 };
    int c[5];

    // now we meant to add a & b and put result in c
    //c = a + b;		// is this allowed? if not what is the alternative
    // NO! This is not allowed
    for (int j = 0; j < 5; j++)
        c[j] = a[j] + b[j];

    for (int i = 1; i <= 5; i++)
        printf("\nc[\"%i\"]  = %i", i-1, c[i-1]);
    printf("\n\n");

}


void m7_t2() {
    int a[5];
    int min, max;
    printf("\nEnter 5 numbers: ");
    for (int i = 0; i < 5; i++)
        scanf_s("%d", &a[i]);
    
    min = a[0];
    max = a[0];
    for (int i = 1; i < 5; i++) {
        if (a[i]<min) 
            min = a[i];

        if (a[i] > max) 
            max = a[i];

    }

    printf("\nMin: %d, Max: %d", min, max);
}

void m7_t3() {
    int number_of_tests;
    float tests[100];
    double total=0, average=0;
    printf("\nEnter Number of tests: ");
    scanf_s("%d", &number_of_tests);

    for (int i = 0; i < number_of_tests; i++) {
        printf("Enter mark for test %d : ", i+1);
        scanf_s("%f", &tests[i]);
        total += tests[i];
    }

    average = total / number_of_tests;

    printf("\nAverage is %.2lf", average);
}

void m8_t1() {
    char first[50] = {'\0'}, last[50] = { '\0' };
    char fullname[61] = { '\0'};    // make null terminated
    printf("\nEnter last name: ");
    scanf_s("%s", last, 50);
    printf("\nEnter first name: ");
    scanf_s("%s", first, 50);
    strcat_s(fullname, first);
    strcat_s(fullname, " ");
    strcat_s(fullname, last);
    printf("Your name is %s\n", fullname);
}


void read_name(char* str) {
    int i = 0;
    do {
        scanf_s("%c", str + i);
        i++;
    } while ( *(str + i - 1)!='\n');

    *(str + i - 1 ) = '\0';
}


void str_cat_custom(char *dest, char* src1, char* src2) {
    //! NOTE: In this code, substitue src1[j] for *(src1+j) to be using strings instead of pointers.
    int i = 0;
    int j = 0;
    // copy src1
    while (*(src1 + j) != '\0') {
        *(dest + i) = *(src1 + j);
        i++;
        j++;
    }
    // add Space
    i++;
    *(dest + i) = ' ';
    // copy src2
    j = 0;
    while (*(src1 + j) != '\0') {
        *(dest + i) = *(src1 + j);
        i++;
        j++;
    }
    i++;
    *(dest + i) = '\0';
}


void m8_t2() {
    char str[50] = {'\0'};
    char first[25] = { '\0' }, last[25] = { '\0' };
    printf("\nEnter full name :");
    read_name(str);

    int i = 0;
    while (str[i] != ' ') {
        first[i] = str[i];
        i++;
    }

    int j = 0;
    while (str[i] != '\0') {
        last[j] = str[i];
        i++;
        j++;
    }
    printf("\nFirst Name %s", first);
    printf("\nLast Name %s", last);

}

void m8_t3() {
    const int fullname_length = 15;

    char first[50] = { '\0' }, last[50] = { '\0' };
    char fullname[fullname_length] = { '\0' };    // make null terminated
    printf("\nEnter first name: ");
    read_name(first);
    printf("\nEnter last name: ");
    read_name(last);
    // str_cat_custom(fullname, first, last);
    int i = 0;
    while (*(first+i) != '\0' && i<fullname_length) {
        *(fullname + i) = *(first+i);
        i++;
    }

    *(fullname + i) = ' ';
    i++;

    int j = 0;
    while (*(last+j)!= '\0' && i<fullname_length) {
        *(fullname + i) = *(last+j);
        i++;
        j++;
    }

    if(i+1 <fullname_length)
        *(fullname + i+1) = '\0';
    else
        *(fullname + fullname_length-1) = '\0';

    printf("\nLenght of first name is %d\nLength of Last Name is %d\nTotal length + a space is %d",
        strlen(first),
        strlen(last),
        strlen(first) + strlen(last) + 1
    );

    if (strlen(first) + strlen(last) + 1 > 15) {
        printf("\nFirst name too long and will be truncated to ");
    }
    else {
        printf("\nThe Full name need not be shortened");
    }

    printf("\n%s\n", fullname);
}

void swap(int* a, int* b) {
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
}
void m9_t1() {
    int x_value = 24680, y_value = 13579;

    printf("\nInitial values of x-coordinate and y-coordinate: %d , %d\n", x_value, y_value);
    swap(&x_value, &y_value);
    printf("\nFinal values of x-coordinate and y-coordinate:   %d , %d\n", x_value, y_value);
}

void m9_t2() {
    char str[50] = { '\0' };
    char first[25] = { '\0' }, last[25] = { '\0' };
    printf("\nEnter full name :");
    read_name(str);

    int i = 0;
    while (*(str + i) != ' ') {
        *(first + i) = *(str + i);
        i++;
    }

    int j = 0;
    while (*(str + i) != '\0') {
        *(last + j) = *(str + i);
        i++;
        j++;
    }
    printf("\nFirst Name %s", first);
    printf("\nLast Name %s", last);

}

void convert(double* mag, double* rads) {
    const double pi = 3.14159265358979323846; // the value of pi
    double X = *mag * cos(*rads * pi /180.0);
    double Y = *mag * sin(*rads * pi / 180.0);
    *mag = X;
    *rads = Y;
}

void m9_t3() {
    double mag, angle;
    std :: cout << std::endl <<"Enter Magnitude and Angle (in degrees) : ";
    scanf_s("%lf %lf", &mag, &angle);
    convert(&mag, &angle);
    printf("\nX: %.3lf, Y: %.3lf", mag, angle);
}