Question

Write a program that displays a menu on the screen. The menu will give the user four options - enter two integers, enter two decimal numbers (#.#), enter one integer and one decimal number, or quit. The inputs should be labelled a, b, c, or d, and you should enter in the letter to choose the appropriate option. Once the user selects the option, two numbers will be read in from the user. The numbers will be added together and then the result will be displayed on the screen. In the case of adding two decimal numbers, make sure that the output shows only two digits after the decimal. For the case of adding an int and a float, give two results - the result where you treat the int as a float, and the result where you cast the float to an int.

write in C

Answer 1

Below is the solution:

#include <stdio.h>

int main(){
   char ch;
   int intNum1, intNum2; //declare integer value
   float floatNum1, floatNum2; //declare float value
   int intSum = 0; //declare integer to sum
   float floatSum = 0.0; //declare float to sum
   while(1){ //loop until user enter d to quit
       menu();//menu
       printf("\nEnter an option: ");
       scanf("%s",&ch);
       switch(ch){
           case 'a':
           case 'A':
               printf("Enter first number: "); //enter first number integer
               scanf("%d",&intNum1);
               printf("Enter second number: "); //enter first second integer
               scanf("%d",&intNum2);
               intSum = intNum1 + intNum2; //add the number
               printf("Sum of %d and %d is: %d",intNum1, intNum2, intSum); //display the integer result
               break;
           case 'b':
           case 'B':
               printf("\nEnter first number: "); //enter first number decimal
               scanf("%f",&floatNum1);
               printf("Enter second number: ");//enter second number decimal
               scanf("%f",&floatNum2);
               floatSum = floatNum1 + floatNum2; //add the number
               printf("Sum of %.2f and %.2f is: %.2f",floatNum1, floatNum2, floatSum); //display the decimal result
               break;  
           case 'c':
           case 'C':
               printf("\nEnter first integer number: "); //enter first number integer
               scanf("%d",&intNum1);
               printf("Enter second decimal number: "); //enter second number decimal
               scanf("%f",&floatNum1);
               floatSum = intNum1 + floatNum1; //add the number
               printf("Sum of %d and %.2f is: %.2f",intNum1, floatNum1, floatSum); //display the float result
               printf("\nSum of %d and %.2f is: %d",intNum1, floatNum1, (int)floatSum); //display the integer casting result
               break;  
           case 'd':
           case 'D':
               printf("Thank You!");
               exit(0);
               break;  
           default:
               printf("Error! invalid input.");
       }
   }
   return 0;
}

void menu(){
   printf("\n\na. Enter two integers\n");
   printf("b. Enter two decimal numbers (#.#)\n");
   printf("c. Enter one integer and one decimal number\n");
   printf("d. Quit\n");  
}

sample output:

a. Enter two integers
b. Enter two decimal numbers (#.#)
c. Enter one integer and one decimal number
d. Quit

Enter an option: a
Enter first number: 12
Enter second number: 13
Sum of 12 and 13 is: 25

a. Enter two integers
b. Enter two decimal numbers (#.#)
c. Enter one integer and one decimal number
d. Quit

Enter an option: b

Enter first number: 12.3
Enter second number: 13.123
Sum of 12.30 and 13.12 is: 25.42

a. Enter two integers
b. Enter two decimal numbers (#.#)
c. Enter one integer and one decimal number
d. Quit

Enter an option: c

Enter first integer number: 12
Enter second decimal number: 13.123
Sum of 12 and 13.12 is: 25.12
Sum of 12 and 13.12 is: 25

a. Enter two integers
b. Enter two decimal numbers (#.#)
c. Enter one integer and one decimal number
d. Quit

Enter an option: e
Error! invalid input.

a. Enter two integers
b. Enter two decimal numbers (#.#)
c. Enter one integer and one decimal number
d. Quit

Enter an option: d

Thank You!