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Solving PSP Question.

Posted Dec 5, 2022
By Vivek Sharma
13 min read

Solving PSP Question

Hello Guys, today i will be showing the problems and solution of my psp class.

1: Familiarization with computer hardware and programming environment, the concept of naming the program files, storing, compilation, execution, and debugging, taking any simple C-code.

i am sorry but idk how to.

moving on

2: Develop a program to solve simple computational problems using arithmetic expressions and use of each operator leading to the simulation of a commercial calculator. (No built-in math function)

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#include <stdio.h>
int main()
{
    char opt;
    int n1, n2, n3;
    float res;
    printf(" Select an operator (+, -, *, /): ");
    scanf("%c", &opt);
    printf(" Enter the first number: ");
    scanf(" %d", &n1);
    printf(" Enter the second number: ");
    scanf(" %d", &n2);

    if (opt == '+')
    {
        n3 = n1 + n2;
        printf(" Addition of %d and %d is: %d", n1, n2, n3);
    }
    else if (opt == '-')
    {
        n3 = n1 - n2;
        printf(" Subtraction of %d and %d is: %d", n1, n2, n3);
    }
    else if (opt == '*')
    {
        n3 = n1 * n2;
        printf(" Multiplication of %d and %d is: %d", n1, n2, n3);
    }
    else if (opt == '/')
    {
        if (n2 == 0)
        {
            printf(" \n Divisor cannot be zero. Please enter another value ");
            scanf("%d", &n2);
        }
        res = n1 / n2;
        printf(" Division of %d and %d is: %.2f", n1, n2, res);
    }
    else
    {
        printf(" \n You have entered wrong inputs ");
    }
}

3: Develop a program to compute the roots of a quadratic equation by accepting the coefficients. Print appropriate messages.

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#include <stdio.h>
#include <math.h>

int main()
{
    float x1, x2, a, b, c, d;
    printf("Input the value of a, b & c: ");
    scanf("%f%f%f", &a, &b, &c);
    d = (b * b) - (4 * a * c);
    if (d == 0)
    {
        printf("Both roots are equal.\n");
        x1 = -b / (2.0 * a);
        x2 = x1;
        printf("First Root = %f", x1);
        printf("second Root = %f", x2);
    }
    else if (d > 0)
    {
        printf("Both Roots are real and diffent \n");
        x1 = (-b + sqrt(d)) / (2 * a);
        x2 = (-b - sqrt(d)) / (2 * a);
        printf("First Root= %f \n", x1);
        printf("Second Root= %f", x2);
    }
    else
    {
        printf("Roots are imaginary \n");
    }
}

4: Develop a program to find the reverse of a positive integer and check for palindrome or not. Display appropriate messages.

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#include <stdio.h>
int main()
{
    int n, reversed = 0, r, orignal;
    printf("Enter an integer: ");
    scanf("%d", &n);
    orignal = n;
    while (n != 0)
    {
        r = n % 10;
        reversed = reversed * 10 + r;
        n /= 10;
    }
    printf("Reversed number = %d\n", reversed);

    if (orignal == reversed)

        printf("%d is a palindome.", orignal);

    else
        printf("%d is not a palindome.", orignal);
}

5: An electricity board charges the following rates for the use of electricity: for the first 200 units 80 Paise per unit: for the next 100 units 90 Paise per unit: beyond 300 units Rs 1 per unit. All users are charged a minimum of Rs. 100 as Meter charge. If the total amount is more than Rs 400, then an additional surcharge of 15% of total amount is charged. Write a program to read the name of the user, number of units consumed and print out the charges.

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#include <stdio.h>
#include <conio.h>
void main()
{
    char name[20];
    float unit, price, extra;
    printf("Enter Consumer's Name: ");
    gets(name);
    printf("Enter Units of electricity used:");
    scanf("%f", &unit);
    if (unit <= 200)
    {
        price = (80 * unit) / 100 + 100;
        puts(name);
        printf("Units = %.2f \nRate = 80 Paise/Unit \nMeter charges = 100 \nPrice = %.2f", unit, price);
    }
    else if (unit > 200 && unit <= 300)
    {
        extra = unit - 200;
        price = (80 * unit) / 100 + 90 * extra / 100 + 100;
        puts(name);
        printf("\nUnits = %.2f \nRate = 80 Paise/Unit for first 200 Units and 90 Paise/Unit for next 100 Units \nMeter charges = 100 \nPrice = %.2f", unit, price);
    }
    else if (unit > 300 && unit <= 400)
    {
        price = unit + 100;
        puts(name);
        printf("\nUnits = %.2f \nRate = 1 Rupees/Unit \nMeter charges = 100 \nPrice = %.2f", unit, price);
    }
    else if (unit > 400)
    {
        price = unit + (0.15 * unit) + 100;
        puts(name);
        printf("\nUnits = %.2f \nRate = 1 Rupees/Unit \nExtra charges = 15% \nMeter charges = 100 \nPrice = %.2f", unit, price);
    }
}

6: Introduce 1D Array manipulation and implement a Binary search.

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#include <stdio.h>
int main()
{
    int i, low, high, mid, n, key, array[100];
    printf("Enter number of elements\n");
    scanf("%d", &n);
    printf("Enter %d integers\n", n);
    for (i = 0; i < n; i++)
        scanf("%d", &array[i]);
    printf("Enter value to find\n");
    scanf("%d", &key);
    low = 0;
    high = n - 1;
    mid = (low + high) / 2;
    while (low <= high)
    {
        if (array[mid] < key)
            low = mid + 1;
        else if (array[mid] == key)
        {
            printf("%d found at location %d.\n", key, mid + 1);
            break;
        }
        else
            high = mid - 1;
        mid = (low + high) / 2;
    }
    if (low > high)
        printf("Not found! %d isn't present in the list.\n", key);
    return 0;
}

7: Implement using functions to check whether the given number is prime and display appropriate messages. (No built-in math function)

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#include <stdio.h>

int main()
{

    int n, i, r = 0;
    printf("Enter a positive integer: ");
    scanf("%d", &n);
    if (n == 0 || n == 1)
        r = 1;

    for (i = 2; i <= n / 2; ++i)
    {
        if (n % i == 0)
        {
            r = 1;
            break;
        }
    }
    if (r == 0)
        printf("%d is a prime number.", n);
    else
        printf("%d is not a prime number.", n);

    return 0;
}

8: Develop a program to introduce 2D Array manipulation and implement Matrix multiplication and ensure the rules of multiplication are checked.

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#include <stdio.h>
#include <stdlib.h>
int main()
{
    int a[10][10], b[10][10], mul[10][10], r, c, i, j, k;
    system("cls");
    printf("enter the number of row=");
    scanf("%d", &r);
    printf("enter the number of column=");
    scanf("%d", &c);
    printf("enter the first matrix element=\n");
    for (i = 0; i < r; i++)
    {
        for (j = 0; j < c; j++)
        {
            scanf("%d", &a[i][j]);
        }
    }
    printf("enter the second matrix element=\n");
    for (i = 0; i < r; i++)
    {
        for (j = 0; j < c; j++)
        {
            scanf("%d", &b[i][j]);
        }
    }

    printf("multiply of the matrix=\n");
    for (i = 0; i < r; i++)
    {
        for (j = 0; j < c; j++)
        {
            mul[i][j] = 0;
            for (k = 0; k < c; k++)
            {
                mul[i][j] += a[i][k] * b[k][j];
            }
        }
    }
    for (i = 0; i < r; i++)
    {
        for (j = 0; j < c; j++)
        {
            printf("%d\t", mul[i][j]);
        }
        printf("\n");
    }
    return 0;
}

9: Develop a Program to compute Sin(x) using Taylor series approximation. Compare your result with the built-in Library function. Print both the results with appropriate messages.

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#include <stdio.h>
#include <math.h>
#define PI 3.142
int main()
{

    int n, i;
    float deg, x, sum = 0, term = 0;
    printf("Enter number of terms\n");
    scanf("%d", &n);
    printf("Enter the degree\n");
    scanf("%f", &deg);
    x = (deg * PI) / 180;
    printf("In radians = %f \n", x);
    term = x;
    sum = term;
    for (i = 3; i <= n; i++)
    {
        term = (-term * x * x) / (i * (i - 1));
        sum = sum + term;
    }
    printf("sin(%f)=%f\n", deg, sum);
    printf("Inbuild funtion sin(%f) =%f\n", deg, sin(x));
    printf("User function sin(%f) = %f", deg, sum);
}

10: Write functions to implement string operations such as compare, concatenate, string length. Convince the parameter passing techniques.

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#include <stdio.h>
#include <string.h>
int main()
{
    int length(char str[100]);
    int compare(char s1[100], char s2[100]);
    void concat(char s1[100], char s2[100]);
    int option, result;
    char str[100], s1[100], s2[100];

    do
    {
        printf("1.String length \n");
        printf("2.string comparision \n");
        printf("3.string concatenation \n");
        printf("4.quit \n");
        printf("enter your choice \n");
        scanf("%d", &option);
        switch (option)
        {
        case 1:
            printf("enter string \n");
            scanf("%s", &str);
            result = length(str);
            printf("the length of string= %d\n", result);
            break;
        case 2:
            printf("enter 1st string\n");
            scanf("%s", &s1);
            printf("enter 2nd string\n");
            scanf("%s", &s2);
            result = compare(s1, s2);
            if (result == 0)
            {
                printf("strings are equal \n");
            }
            else
            {
                printf("strings are not equal \n");
            }
                break;

        case 3:
            printf("enter two strings\n");
            scanf("%s%s", s1, s2);
            concat(s1, s2);
            printf("result=%s \n", s1);
            break;
        }
    } while (option <= 3);
    return 0;
}
int length(char str[100])
{
    int i = 0;
    while (str[i] != '\0')
        i++;
    return (i);
}
int compare(char s1[100], char s2[100])
{
    int i = 0;
    while (s1[i] != '\0')
    {
        if (s1[i] > s2[i])
            return (1);
        else if (s1[i] < s2[i])
            return (-1);
        i++;
    }
    return 0;
}
void concat(char s1[100], char s2[100])
{
    int i, j;
    i = 0;
    while (s1[i] != '\0')
        i++;
    for (j = 0; s2[j] != '\0'; i++, j++)
        s1[i] = s2[j];
    s1[i] = '\0';
}

11: Develop a program to sort the given set of numbers using Bubble sort.

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#include <stdio.h>
int main()
{
    int n, j, i, swap;
    printf("Enter number of elements\n");
    scanf("%d", &n);
    int array[n];
    printf("Enter %d integers\n", n);
    for (i = 0; i < n; i++)
    {
        scanf("%d", &array[i]);
    }
    for (i = 0; i < n - 1; i++)
    {
        for (j = 0; j < n - i - 1; j++)
        {
            if (array[j] > array[j + 1])
            {
                swap = array[j];
                array[j] = array[j + 1];
                array[j + 1] = swap;
            }
        }
    }

    printf("Sorted list in ascending order:\n");

    for (i = 0; i < n; i++)
        printf("%d\n", array[i]);
    return 0;
}

12: Develop a program to find the square root of a given number N and executes for all possible inputs with appropriate messages. Note: Don’t use library function sqrt(n).

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#include <stdio.h>
#include<math.h>
int main()
{
    int n, i = 1, dr, dd, j = 1, d;
    printf("Enter the number : ");
    scanf("%d", &n);
    while (i * i < n)
    {
        i = i + 1;
    }
    i = i - 1;
    printf("%d.", i);
    dr = 2 * i;
    dd = n - (i * i);
    while (j <= 5)
    {
        dd = dd * 100;
        d = 0;
        while ((dr * 10 + d) * d < dd)
        {
            d = d + 1;
        }
        d = d - 1;

        printf("%d",d);
        dd = dd - ((dr * 10 + d) * d);
        dr = dr * 10 + 2 * d;
        j = j + 1;
    }
}

13: Implement structures to read, write, and compute average-marks and the students scoring above and below the average marks for a class of N students

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#include <stdio.h>
struct student
{
    int marks;
} st[10];
void main()
{
    int i, n;
    float total = 0, avgmarks;
    printf("\nEnter the number of students in class:");
    scanf("%d", &n);
    for (i = 0; i < n; i++)
    {
        printf("\nEnter student %d marks :", i + 1);
        scanf("%d", &st[i].marks);
    }
    for (i = 0; i < n; i++)
    {
        total = total + st[i].marks;
    }
    avgmarks = total / n;
    printf("\nAverage marks = %.2f", avgmarks);
    for (i = 0; i < n; i++)
    {
        if (st[i].marks >= avgmarks)
        {
            printf("\n student %d marks = %d above average", i + 1, st[i].marks);
        }
        else
        {
            printf("\n student %d marks = %d below average", i + 1, st[i].marks);
        }
    }
}

14: Develop a program using pointers to compute the sum, mean and standard deviation of all elements stored in an array of n real numbers.

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#include <stdio.h>
#include <conio.h>
void main()
{
    int arr[10], n, i, sum = 0, mean;

    int *ptr = arr;
    printf("Enter the number of elements you want to use: ");
    scanf("%d", &n);
    printf("\nEnter %d Elements:", n);
    for (i = 0; i < n; i++)
        scanf("%d", &arr[i]);

    for (i = 0; i < n; i++)
    {
        sum += *ptr;
        *ptr++;
    }

    mean = sum / n;
    printf("\nSum = %d\nmean = %d", sum, mean);
}

15: Implement Recursive functions for Binary to Decimal Conversion.

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#include <stdio.h>
int BinaryToDecimal(int n)
{
    if (n == 0)
        return 0;
    else
        return (n % 10 + 2 * BinaryToDecimal(n / 10));
}
int main()
{
    int n;
    printf("Enter the Binary Value:");
    scanf("%d", &n);
    printf("Decimal Value of Binary number is: %d", BinaryToDecimal(n));
}
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