C Programming Language || Hands On Coding

#include <stdio.h>

int main() {
  int N, i = 1;

  printf("Enter the value of N: ");
  scanf("%d", &N);

  while (i <= N) {
    printf("%d ", i);
    i++;
  }
  printf("n");

  return 0;
}

Input: 5
Output: 1 2 3 4 5

#include <stdio.h>

int main() {
  int choice;
  float value, result;

  printf("Unit Convertern");
  printf("1. Celsius to Fahrenheitn");
  printf("2. Fahrenheit to Celsiusn");
  printf("Enter your choice (1 or 2): ");
  scanf("%d", &choice);

  switch (choice) {
    case 1:
      printf("Enter temperature in Celsius: ");
      scanf("%f", &value);
      result = (value * 9 / 5) + 32;
      printf("Temperature in Fahrenheit: %.2fn", result);
      break;
    case 2:
      printf("Enter temperature in Fahrenheit: ");
      scanf("%f", &value);
      result = (value - 32) * 5 / 9;
      printf("Temperature in Celsius: %.2fn", result);
      break;
    default:
      printf("Invalid choice!n");
  }

  return 0;
}

Unit Converter
1. Celsius to Fahrenheit
2. Fahrenheit to Celsius
Enter your choice (1 or 2): Input: 1
Enter temperature in Celsius: Input: 25
Temperature in Fahrenheit: 77.00
Unit Converter
1. Celsius to Fahrenheit
2. Fahrenheit to Celsius
Enter your choice (1 or 2): Input: 2
Enter temperature in Fahrenheit: Input: 98.6
Temperature in Celsius: 37.00
Unit Converter
1. Celsius to Fahrenheit
2. Fahrenheit to Celsius
Enter your choice (1 or 2): Input: 3
Invalid choice!

#include <stdio.h>

int main() {
  int month;

  printf("Enter month number (1-12): ");
  scanf("%d", &month);

  switch (month) {
    case 12:
    case 1:
    case 2:
      printf("Wintern");
      break;
    case 3:
    case 4:
    case 5:
      printf("Springn");
      break;
    case 6:
    case 7:
    case 8:
      printf("Summern");
      break;
    case 9:
    case 10:
    case 11:
      printf("Autumnn");
      break;
    default:
      printf("Invalid month number.n");
  }

  return 0;
}

Input: 1
Output: Winter

Input: 4
Output: Spring

Input: 7
Output: Summer

Input: 10
Output: Autumn

Input: 13
Output: Invalid month number.

#include <stdio.h>

int main() {
  int marks;

  printf("Enter your marks: ");
  scanf("%d", &marks);

  switch (marks / 10) {
    case 10:
    case 9:
      printf("Grade: An");
      break;
    case 8:
      printf("Grade: Bn");
      break;
    case 7:
      printf("Grade: Cn");
      break;
    case 6:
      printf("Grade: Dn");
      break;
    default:
      printf("Grade: Fn");
      break;
  }

  return 0;
}

Input: 95
Output: Grade: A

Input: 82
Output: Grade: B

Input: 78
Output: Grade: C

Input: 61
Output: Grade: D

Input: 50
Output: Grade: F

Input: 100
Output: Grade: A

Input: 0
Output: Grade: F

#include <stdio.h>

int main() {
    int choice;
    float radius, side, length, width, base, height;

    printf("Menu:n");
    printf("1. Calculate Area of Circlen");
    printf("2. Calculate Area of Squaren");
    printf("3. Calculate Area of Rectanglen");
    printf("4. Calculate Area of Trianglen");
    printf("Enter your choice: ");
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            printf("Enter the radius of the circle: ");
            scanf("%f", &radius);
            printf("Area of Circle: %.2fn", 3.14159 * radius * radius);
            break;
        case 2:
            printf("Enter the side of the square: ");
            scanf("%f", &side);
            printf("Area of Square: %.2fn", side * side);
            break;
        case 3:
            printf("Enter the length and width of the rectangle: ");
            scanf("%f %f", &length, &width);
            printf("Area of Rectangle: %.2fn", length * width);
            break;
        case 4:
            printf("Enter the base and height of the triangle: ");
            scanf("%f %f", &base, &height);
            printf("Area of Triangle: %.2fn", 0.5 * base * height);
            break;
        default:
            printf("Invalid choice!n");
    }

    return 0;
}

Menu:
1. Calculate Area of Circle
2. Calculate Area of Square
3. Calculate Area of Rectangle
4. Calculate Area of Triangle
Enter your choice: 1
Input: 5
Enter the radius of the circle: Area of Circle: 78.54
Menu:
1. Calculate Area of Circle
2. Calculate Area of Square
3. Calculate Area of Rectangle
4. Calculate Area of Triangle
Enter your choice: 2
Input: 7
Enter the side of the square: Area of Square: 49.00
Menu:
1. Calculate Area of Circle
2. Calculate Area of Square
3. Calculate Area of Rectangle
4. Calculate Area of Triangle
Enter your choice: 3
Input: 4 6
Enter the length and width of the rectangle: Area of Rectangle: 24.00
Menu:
1. Calculate Area of Circle
2. Calculate Area of Square
3. Calculate Area of Rectangle
4. Calculate Area of Triangle
Enter your choice: 4
Input: 8 3
Enter the base and height of the triangle: Area of Triangle: 12.00
Menu:
1. Calculate Area of Circle
2. Calculate Area of Square
3. Calculate Area of Rectangle
4. Calculate Area of Triangle
Enter your choice: 5
Input: 5
Invalid choice!

#include <stdio.h>

int main() {
    char light;

    printf("Enter a traffic light color (R, Y, G): ");
    scanf(" %c", &light);

    switch (light) {
        case 'R':
            printf("STOP!n");
            break;
        case 'Y':
            printf("CAUTION! Prepare to stop.n");
            break;
        case 'G':
            printf("GO!n");
            break;
        default:
            printf("Invalid input.n");
    }

    return 0;
}

Input: R
Output: Enter a traffic light color (R, Y, G): STOP!

Input: Y
Output: Enter a traffic light color (R, Y, G): CAUTION! Prepare to stop.

Input: G
Output: Enter a traffic light color (R, Y, G): GO!

Input: B
Output: Enter a traffic light color (R, Y, G): Invalid input.

#include <stdio.h>

int main() {
    char ch;

    printf("Enter an alphabet: ");
    scanf(" %c", &ch);

    switch (ch) {
        case 'a':
        case 'e':
        case 'i':
        case 'o':
        case 'u':
        case 'A':
        case 'E':
        case 'I':
        case 'O':
        case 'U':
            printf("%c is a vowel.n", ch);
            break;
        default:
            printf("%c is a consonant.n", ch);
    }

    return 0;
}

Input: a
Output: a is a vowel.

Input: b
Output: b is a consonant.

Input: A
Output: A is a vowel.

Input: Z
Output: Z is a consonant.

Input: e
Output: e is a vowel.

Input: q
Output: q is a consonant.

#include <stdio.h>

int main() {
    int num1, num2, choice, result;

    printf("Enter first number: ");
    scanf("%d", &num1);

    printf("Enter second number: ");
    scanf("%d", &num2);

    printf("Choose an operation:n");
    printf("1. Additionn");
    printf("2. Subtractionn");
    printf("3. Multiplicationn");
    printf("4. Divisionn");
    printf("Enter your choice (1-4): ");
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            result = num1 + num2;
            printf("Result: %dn", result);
            break;
        case 2:
            result = num1 - num2;
            printf("Result: %dn", result);
            break;
        case 3:
            result = num1 * num2;
            printf("Result: %dn", result);
            break;
        case 4:
            if (num2 != 0) {
                result = num1 / num2;
                printf("Result: %dn", result);
            } else {
                printf("Error: Division by zero!n");
            }
            break;
        default:
            printf("Invalid choice!n");
    }

    return 0;
}

Input: 10
Input: 5
Input: 1
Output: Result: 15

Input: 10
Input: 5
Input: 2
Output: Result: 5

Input: 10
Input: 5
Input: 3
Output: Result: 50

Input: 10
Input: 5
Input: 4
Output: Result: 2

Input: 10
Input: 0
Input: 4
Output: Error: Division by zero!

Input: 10
Input: 5
Input: 5
Output: Invalid choice!

#include <stdio.h>

int main() {
  int month_number;

  printf("Enter a month number (1-12): ");
  scanf("%d", &month_number);

  switch (month_number) {
    case 1:
      printf("Januaryn");
      break;
    case 2:
      printf("Februaryn");
      break;
    case 3:
      printf("Marchn");
      break;
    case 4:
      printf("Apriln");
      break;
    case 5:
      printf("Mayn");
      break;
    case 6:
      printf("Junen");
      break;
    case 7:
      printf("Julyn");
      break;
    case 8:
      printf("Augustn");
      break;
    case 9:
      printf("Septembern");
      break;
    case 10:
      printf("Octobern");
      break;
    case 11:
      printf("Novembern");
      break;
    case 12:
      printf("Decembern");
      break;
    default:
      printf("Invalid month number. Please enter a number between 1 and 12.n");
  }

  return 0;
}

Enter a month number (1-12): 1
January

Enter a month number (1-12): 5
May

Enter a month number (1-12): 12
December

Enter a month number (1-12): 0
Invalid month number. Please enter a number between 1 and 12.

Enter a month number (1-12): 13
Invalid month number. Please enter a number between 1 and 12.

#include <stdio.h>

int main() {
    char operator;
    float num1, num2, result;

    printf("Enter operator (+, -, *, /): ");
    scanf(" %c", &operator);

    printf("Enter two numbers: ");
    scanf("%f %f", &num1, &num2);

    switch (operator) {
        case '+':
            result = num1 + num2;
            printf("%.2f + %.2f = %.2fn", num1, num2, result);
            break;
        case '-':
            result = num1 - num2;
            printf("%.2f - %.2f = %.2fn", num1, num2, result);
            break;
        case '*':
            result = num1 * num2;
            printf("%.2f * %.2f = %.2fn", num1, num2, result);
            break;
        case '/':
            if (num2 == 0) {
                printf("Error: Division by zeron");
            } else {
                result = num1 / num2;
                printf("%.2f / %.2f = %.2fn", num1, num2, result);
            }
            break;
        default:
            printf("Error: Invalid operatorn");
    }

    return 0;
}

Input: +
Input: 10.5 5.2
Output: 10.50 + 5.20 = 15.70

Input: -
Input: 20.0 7.5
Output: 20.00 - 7.50 = 12.50

Input: *
Input: 8.0 3.0
Output: 8.00 * 3.00 = 24.00

Input: /
Input: 15.0 3.0
Output: 15.00 / 3.00 = 5.00

Input: /
Input: 10.0 0.0
Output: Error: Division by zero

Input: %
Input: 5.0 2.0
Output: Error: Invalid operator

#include <stdio.h>

int main() {
  int day;

  printf("Enter a number (1-7): ");
  scanf("%d", &day);

  switch (day) {
    case 1:
      printf("Sundayn");
      break;
    case 2:
      printf("Mondayn");
      break;
    case 3:
      printf("Tuesdayn");
      break;
    case 4:
      printf("Wednesdayn");
      break;
    case 5:
      printf("Thursdayn");
      break;
    case 6:
      printf("Fridayn");
      break;
    case 7:
      printf("Saturdayn");
      break;
    default:
      printf("Invalid input!n");
  }

  return 0;
}

Input: 1
Output: Sunday

Input: 4
Output: Wednesday

Input: 7
Output: Saturday

Input: 0
Output: Invalid input!

Input: 8
Output: Invalid input!

#include <stdio.h>

int main() {
    int num1, num2, choice, result;

    printf("Enter two numbers: ");
    scanf("%d %d", &num1, &num2);

    printf("Choose an operation:n");
    printf("1. Additionn");
    printf("2. Subtractionn");
    printf("3. Multiplicationn");
    printf("4. Divisionn");
    printf("Enter your choice (1-4): ");
    scanf("%d", &choice);

    if (choice == 1) {
        result = num1 + num2;
        printf("Result: %dn", result);
    } else if (choice == 2) {
        result = num1 - num2;
        printf("Result: %dn", result);
    } else if (choice == 3) {
        result = num1 * num2;
        printf("Result: %dn", result);
    } else if (choice == 4) {
        if (num2 == 0) {
            printf("Cannot divide by zero.n");
        } else {
            result = num1 / num2;
            printf("Result: %dn", result);
        }
    } else {
        printf("Invalid choice.n");
    }

    return 0;
}

Input: 10 5
Output: Enter two numbers: Choose an operation:
1. Addition
2. Subtraction
3. Multiplication
4. Division
Enter your choice (1-4): Result: 15

Input: 10 5
Output: Enter two numbers: Choose an operation:
1. Addition
2. Subtraction
3. Multiplication
4. Division
Enter your choice (1-4): Result: 5

Input: 10 5
Output: Enter two numbers: Choose an operation:
1. Addition
2. Subtraction
3. Multiplication
4. Division
Enter your choice (1-4): Result: 50

Input: 10 5
Output: Enter two numbers: Choose an operation:
1. Addition
2. Subtraction
3. Multiplication
4. Division
Enter your choice (1-4): Result: 2

Input: 10 0
Output: Enter two numbers: Choose an operation:
1. Addition
2. Subtraction
3. Multiplication
4. Division
Enter your choice (1-4): Cannot divide by zero.

Input: 10 5
Output: Enter two numbers: Choose an operation:
1. Addition
2. Subtraction
3. Multiplication
4. Division
Enter your choice (1-4): Invalid choice.

#include <stdio.h>

int main() {
    float weight, height, bmi;

    printf("Enter your weight in kilograms: ");
    scanf("%f", &weight);

    printf("Enter your height in meters: ");
    scanf("%f", &height);

    bmi = weight / (height * height);

    printf("Your BMI is: %.2fn", bmi);

    if (bmi < 18.5) {
        printf("Category: Underweightn");
    } else if (bmi < 25) {
        printf("Category: Normal weightn");
    } else if (bmi < 30) {
        printf("Category: Overweightn");
    } else {
        printf("Category: Obesen");
    }

    return 0;
}

Input: 70
Input: 1.75
Output: Your BMI is: 22.86
Output: Category: Normal weight

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

int main() {
    float a, b, c, discriminant, root1, root2, realPart, imaginaryPart;

    printf("Enter coefficients a, b and c: ");
    scanf("%f %f %f", &a, &b, &c);

    discriminant = b * b - 4 * a * c;

    if (discriminant > 0) {
        root1 = (-b + sqrt(discriminant)) / (2 * a);
        root2 = (-b - sqrt(discriminant)) / (2 * a);
        printf("Root 1 = %.2f and Root 2 = %.2f", root1, root2);
    } else if (discriminant == 0) {
        root1 = root2 = -b / (2 * a);
        printf("Root 1 = Root 2 = %.2f;", root1);
    } else {
        realPart = -b / (2 * a);
        imaginaryPart = sqrt(-discriminant) / (2 * a);
        printf("Root 1 = %.2f+%.2fi and Root 2 = %.2f-%.2fi", realPart, imaginaryPart, realPart, imaginaryPart);
    }

    return 0;
}

Input: 1 5 6
Output: Root 1 = -2.00 and Root 2 = -3.00
Input: 1 2 1
Output: Root 1 = Root 2 = -1.00;
Input: 1 2 5
Output: Root 1 = -1.00+2.00i and Root 2 = -1.00-2.00i

#include <stdio.h>

int main() {
    char ch;

    printf("Enter a character: ");
    scanf(" %c", &ch);

    if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
        printf("Alphabetn");
    } else if (ch >= '0' && ch <= '9') {
        printf("Digitn");
    } else {
        printf("Special charactern");
    }

    return 0;
}

Input: A
Output: Alphabet

Input: 5
Output: Digit

Input: $
Output: Special character

Input: a
Output: Alphabet

#include <stdio.h>

int main() {
  int number;

  printf("Enter a number between 1 and 10: ");
  scanf("%d", &number);

  if (number == 1) {
    printf("Onen");
  } else if (number == 2) {
    printf("Twon");
  } else if (number == 3) {
    printf("Threen");
  } else if (number == 4) {
    printf("Fourn");
  } else if (number == 5) {
    printf("Fiven");
  } else if (number == 6) {
    printf("Sixn");
  } else if (number == 7) {
    printf("Sevenn");
  } else if (number == 8) {
    printf("Eightn");
  } else if (number == 9) {
    printf("Ninen");
  } else if (number == 10) {
    printf("Tenn");
  } else {
    printf("Invalid input. Please enter a number between 1 and 10.n");
  }

  return 0;
}

Enter a number between 1 and 10: 5
Five

Enter a number between 1 and 10: 11
Invalid input. Please enter a number between 1 and 10.

Enter a number between 1 and 10: 1
One

Enter a number between 1 and 10: 10
Ten

#include <stdio.h>

int main() {
    int dayNumber;

    printf("Enter a number (1-7): ");
    scanf("%d", &dayNumber);

    if (dayNumber == 1) {
        printf("Sundayn");
    } else if (dayNumber == 2) {
        printf("Mondayn");
    } else if (dayNumber == 3) {
        printf("Tuesdayn");
    } else if (dayNumber == 4) {
        printf("Wednesdayn");
    } else if (dayNumber == 5) {
        printf("Thursdayn");
    } else if (dayNumber == 6) {
        printf("Fridayn");
    } else if (dayNumber == 7) {
        printf("Saturdayn");
    } else {
        printf("Invalid input. Please enter a number between 1 and 7.n");
    }

    return 0;
}

Enter a number (1-7): 1
Sunday

Enter a number (1-7): 4
Wednesday

Enter a number (1-7): 7
Saturday

Enter a number (1-7): 0
Invalid input. Please enter a number between 1 and 7.

Enter a number (1-7): 8
Invalid input. Please enter a number between 1 and 7.

Enter a number (1-7): 5
Thursday

#include <stdio.h>

int main() {
  int units;
  float bill;

  printf("Enter the number of units consumed: ");
  scanf("%d", &units);

  if (units <= 50) {
    bill = units * 0.50;
  } else if (units <= 150) {
    bill = 25 + (units - 50) * 0.75;
  } else if (units <= 250) {
    bill = 100 + (units - 150) * 1.00;
  } else {
    bill = 200 + (units - 250) * 1.25;
  }

  printf("Electricity bill: Rs. %.2fn", bill);

  return 0;
}

Input: 30
Output: Electricity bill: Rs. 15.00
Input: 100
Output: Electricity bill: Rs. 62.50
Input: 200
Output: Electricity bill: Rs. 150.00
Input: 300
Output: Electricity bill: Rs. 262.50