This C program uses a switch statement to allow a user to select an arithmetic operation - addition or subtraction - to perform on two numbers. The user enters their choice, and then enters two numbers. The switch statement directs the program to either add or subtract the numbers based on the user's initial selection, and displays the result. The program ends if the user selects the exit option.

1. Switch
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
main ()
{
printf("Nisarat Kramsri No.16 M.6/1nn");
Nisarat Kramsri No.16 M.6/1
int choice;
float num1,num2; num1,num2
printf("Please select choicen");
printf("1.Program additionn");
printf("2.Program substractionn");
printf("3.Exit programn");
scanf("%d",&choice);

2. switch(choice) switch
case 3:exit(3);
printf("Enter number1: ");
scanf("%f",&num1);
printf("Enter number2: ");
scanf("%f",&num2);
switch(choice) switch
{
case 1:
printf("%.2f+%.2f=%.2fn",num1,num2,num1+num2);break;
case 2: printf("%.2f-%.2f=%.2fn",num1,num2,num1-
num2);break;
}
getch();

3. }

5. Flowchart
Kittawan
Tamprasert No.
M.
Choice
yes
Choice=3
no
Choice=1 Choice=2
Num1+num2 Num1-num2