sri ramanuja seva

// Program to build a scientific calculator using built-in functions 
#include <stdio.h>  //for printf(, scanf())
#include <math.h>   //for mathematical functions like pow(), etc 
int main()
{
    double m, n; //double data type allows decimal points with high precision 
    int choice;  //choice entered by user 
    
    printf("SCIENTIFIC CALCULATOR\n"); 
    //arithmetic operations 
    printf("1. Addition\n"); 
    printf("2. Subtraction\n"); 
    printf("3. Multiplication\n"); 
    printf("4. Division\n");
    
    //power and square root
    printf("5. Square root\n"); 
    printf("6. Power\n"); 
    
    //Trigonometic functions 
    printf("7. sin\n"); 
    printf("8. cos\n"); 
    
    //ask user to make a choice 
    printf("Which operation do you wish to perform?\n"); 
    printf("Enter a number from 1 to 8: "); 
    
    //get input from user 
    scanf("%d", &choice); 
    
    //use switch-case to process user input, and perform appropriate operation
    switch (choice)
    { 
        case 1: //addition 
                printf("Enter 2 numbers: "); 
                scanf("%lf %lf", &m, &n); // format specifier %lf is for double values 
                printf("Sum is %.2lf \n", m+n); //round off result to 2 decimal places
                break; //exit the switch block 
                
        case 2: //subtraction 
                printf("Enter 2 numbers: "); 
                scanf("%lf %lf", &m, &n); 
                printf("Difference is %.2lf \n", m-n); 
                break; 
                
        case 3: //multiplication 
                printf("Enter 2 numbers: "); 
                scanf("%lf %lf", &m, &n); 
                printf("Product is %.2lf \n", m*n); 
                break; 
                
        case 4: //division 
                printf("Enter 2 numbers: "); 
                scanf("%lf %lf", &m, &n);
                if (n == 0) //check for division by zero 
                {
                    printf("Division by zero is not allowed\n"); 
                }
                else
                {
                    printf("Quotient is %.2lf \n", m/n); 
                }
                break; 
                
        case 5: //square root 
                printf("Enter a non-negative number: "); 
                scanf("%lf", &m);
                if (m < 0) //check if number is negative 
                {
                    printf("Square root of negative number is not allowed\n"); 
                }
                else 
                {
                    printf("Square root is %.2lf \n", sqrt(m)); //use the sqrt() function from math.h
                }
                break; 
                
        case 6: //power or exponentiation 
                printf("Enter base and exponent: "); 
                scanf("%lf %lf", &m, &n); 
                printf("Power is %.2lf \n", pow(m,n)); //use the pow() function from math.h
                break; 
                
        case 7: //sin
                printf("Enter value in radians: "); 
                scanf("%lf", &m); 
                printf("sin value is %.2lf \n", sin(m)); 
                break; 
        
        case 8: //cos 
                printf("Enter value in radians: "); 
                scanf("%lf", &m); 
                printf("cos value is %.2lf \n", cos(m)); 
                break; 
                
        default: 
                printf("Invalid choice!\n"); 
    } 
    printf("Thanks, have a nice day!"); 
    
    
    return 0;
}