calculator.c

#include <stdio.h>  
#include <math.h>  
#include <stdlib.h>  
  
int main()  
{    
    int action, n1, n2;  
    float res;  
    char ch;  
    do  
    {    
        printf (" Select an operation to perform the calculation in C Calculator: ");  
        printf (" \n 1 Addition  \t \t 2 Subtraction \n 3 Multiplication \t 4 Division \n 5 Square \t \t 6 Square Root \n 7 Exit \n \n Please, Make a choice ");      
          
        scanf ("%d", &action);
    switch (action)  
    {  
        case 1:    
            printf (" You chose: Addition");  
            printf ("\n Enter First Number: ");  
            scanf (" %d", &n1);  
            printf (" Enter Second Number: ");  
            scanf (" %d", &n2);  
            res = n1 + n2;   
            printf (" Addition of two numbers is: %.2f", res);  
            break;   
              
        case 2:    
            printf (" You chose: Subtraction");  
            printf ("\n Enter First Number: ");  
            scanf (" %d", &n1);  
            printf (" Enter Second Number: ");  
            scanf (" %d", &n2);  
            res = n1 - n2;  
            printf (" Subtraction of two numbers is: %.2f", res);  
            break;   
              
        case 3:
            printf (" You chose: Multiplication");  
            printf ("\n Enter First Number: ");  
            scanf (" %d", &n1);  
            printf (" Enter Second Number: ");  
            scanf (" %d", &n2);  
            res = n1 * n2;   
            printf (" Multiplication of two numbers is: %.2f", res);  
            break;   
              
        case 4:   
            printf (" You chose: Division");  
            printf ("\n Enter First Number: ");  
            scanf (" %d", &n1);  
            printf (" Enter Second Number: ");  
            scanf (" %d", &n2);  
            if (n2 == 0)  
                {  
                    printf (" \n Divisor cannot be zero. Please enter another value ");  
                    scanf ("%d", &n2);        
                }  
            res = n1 / n2;  
            printf (" Division of two numbers is: %.2f", res);  
            break; 
              
        case 5:    
            printf (" You chose: Square");  
            printf ("\n Enter First Number: ");  
            scanf (" %d", &n1);  
  
            res = n1 * n1;  
            printf (" Square of %d number is: %.2f", n1, res);  
            break; 
              
        case 6:    
            printf (" You chose: Square Root");  
            printf ("\n Enter First Number: ");  
            scanf (" %d", &n1);  
              
            res = sqrt(n1);  
            printf (" Square Root of %d numbers is: %.2f", n1, res);  
            break; 
              
        case 7:  
            printf (" You chose: Exit");  
            exit(0);   
            break; 
              
        default:  
            printf(" Something is wrong!! ");  
            break;                        
    }  
    printf (" \n \n ********************************************** \n ");  
    } while (action != 7);  
  
    return 0;        
}