Computer Programming for Beginners & Elementary Mathematics and Science: Switch Case Control Statement in C

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A C Program to accept Week-day no. and display the Day-name
A C Program to accept Month-number and display Month-name.
A C Program to accept colour-code and display colour-name (0-black,1-red,2-green,3-blue,4-white).
A C Program to accept month-number and display the number of days in that month.
A C Program to accept two numbers and an operator(+,-,x,/) then perform appropriate calculation as per the operator entered
A C Program to Display a menu regarding different kinds of formula, and then based upon user’s choice perform necessary operations.

//A C Program to accept Week-day no. and display the Day-name. Assuming Day1 as Sunday

#include<stdio.h>

int main()
{
    int day_num;

    printf("\nEnter day number of the week: ");
    scanf(“%d”,&day_num);

    switch(day_num)
    {
        case 1:
            printf("\nSelected day is SUNDAY.");
            break;
        case 2:
            printf("\nSelected day is MONDAY.");
            break;
        case 3:
            printf("\nSelected day is TUESDAY.");
            break;
        case 4:
            printf("\nSelected day is WEDNESDAY.");
            break;
        case 5:
            printf("\nSelected day is THURSDAY.");
            break;
        case 6:
            printf("\nSelected day is FRIDAY.");
            break;
        case 7:
            printf("\nSelected day is SATURDAY.");
            break;
        default:
           printf("\nError!!! Invalid Day-Number. Enter between 1 to 7.");

    };
    return 0;
};

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/*Write a C Program to accept two numbers and an operand(+,-,x,/) then perform appropriate calculation as per the operator entered and display the corresponding output
Author: Pradeep Das Gupta

Compiler: GNU GCC Compiler*/
#include<stdio.h>

int main()
{
    float x,y,z;
    char op;

    printf("\nEnter two numbers (X): ");
    scanf(“%f”,&x);
    printf("\n(Y): ");
    scanf(“%f”,&y);

    printf("\nEnter operator (+,-,x,/): ");
    scanf(“%c”,&op);

    switch(op)
    {
        case '+':
            z=x+y;
            printf(“\n%f + %f = %f”,x,y,z);
            break;
        case '-':
            z=x-y;
            printf(“\n%f - %f = %f”,x,y,z);
            break;
        case 'x':
            z=x*y;
            printf(“\n%f x %f = %f”,x,y,z);
            break;
        case '/':
            if(y==0)
            {
                printf("\nError!!! Division by Zero not allowed.");
                break;
            }
            z=x/y;
            printf(“\n%f / %f = %f”,x,y,z);
            break;
        default:
            printf("\nError!!! Invalid Operator.");
    }
    return 0;
}
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/*A menu driven C Program:
Write a C Program to display a menu as follows;

1.Area of Triangle (using base and altitude)
2.Area of triangle (using 3 sides)
3.Area of equilateral triangle
4.Exit
Select your operation (1,2,3 or 4):

The program should take the user's choice and based upon his/her choice, it should perform the appropriate operation.
Author: Pradeep Das Gupta

Compiler: GNU GCC Compiler
*/
#include<math.h>
#include<stdio.h>
#include<stdlib.h>

int main()
{
    float x,y,z,ar,temp;
    short int ch;

    do
    {
        system("cls");//clears the screen

        cout<<"\nMENU\n********************";
        printf("\n1.Area of Triangle (using base and altitude)");
            printf("\n2.Area of triangle (using 3 sides)");
            printf("\n3.Area of equilateral triangle");
            printf("\n4.Exit");
            printf("\nSelect your operation (1,2,3 or 4): ");
        scanf(“%d”,&ch);

        switch(ch)
        {
            case 1: //Area of Triangle (using base and altitude)
                printf("\nEnter Base: ");
                scanf(“%f”,&x);
                printf("\nEnter Corresponding Altitude: ");
                scanf(“%f”,&y);
                ar=0.5*x*y;
                printf(“\nArea = %f sq. units”,ar);
                break;
            case 2: //Area of triangle (using 3 sides)
                printf("\nEnter Side1: ");
                scanf(“%f”,&x);
                printf("\nEnter Side2: ");
                scanf(“%f”,&y);
                printf("\nEnter Side3: ");
                scanf(“%f”,&z);
                temp=0.5*(x+y+z);//semi-perimeter
                ar=sqrt(temp*(temp-x)*(temp-y)*(temp-z));
                printf(“\nArea = %f sq. units”,ar);
                break;
            case 3: //Area of equilateral triangle
                printf("\nEnter the side: ");
                scanf(“%f”,&x);
                ar=sqrt(3)*0.25*pow(x,2);
                printf(“\nArea = %f sq. units”,ar);
                break;
            case 4: //Exit
                break;
            default: //For Invalid Choice
                printf("\nERROR!!! Invalid Choice Entered.\ nChoose between 1 to 4.");
        }
        printf("\nProcess Paused...\nPress [ENTER] to continue.....");
        getc(stdin);
    }while(ch!=4);

    return 0;
}

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