Question

Write a program that acts as a basic calculator

• Assume the starting result is 0
• Ask the user for the operation to be performed
  • 0 – Exit
  • 1 – Add
  • 2 – Subtract
  • 3 – Multiply
  • 4 – Divide (Assume input will not be 0)
• Keep on performing the operation and showing the result until the user inputs the ‘0’ (exit) operation.
• You need to have everything written as functions
  • E.g. - You should only have the options listed once in the code
• You should have 4 different functions for each operation.
  • Any 2 of these functions should not return anything but instead use parameter passing by reference/pointers.
  • The other 2 functions should pass the parameter by value and have return statements (make sure to have a way to restrict the users to not make any changes to the original result variable).
• Your main function should be just the following lines

please use #include studio not ios.stream

int main(int argc, char* argv[])

{

    calculator();

    return 0;

}

/* Sample run of the program - Input and Output */

0 - Exit

1 - Add

2 - Subtract

3 - Multiply

4 - Divide

Please select an option : 1

Please enter the value : 5

Result = 5.000000

0 - Exit

1 - Add

2 - Subtract

3 - Multiply

4 - Divide

Please select an option : 2

Please enter the value : 1

Result = 4.000000

0 - Exit

1 - Add

2 - Subtract

3 - Multiply

4 - Divide

Please select an option : 3

Please enter the value : 3

Result = 12.000000

0 - Exit

1 - Add

2 - Subtract

3 - Multiply

4 - Divide

Please select an option : 4

Please enter the value : 2

Result = 6.000000

0 - Exit

1 - Add

2 - Subtract

3 - Multiply

4 - Divide

Please select an option : 0

Answer 1

#include <stdio.h>
float add(float a,float b){return a+b;}
float sub(float a,float b){return a-b;}
void mul(float *a,float b){*a=(*a)*b;}
void divi(float *a,float b){*a =( *a)/b;}
void claculator()
{ float result=0;
float inp=0;
int opt=-1;
while(1)
{
printf("0-Exit\n1-Add\n2-Substarct\n3-Multiply\n4-Divide\n");
printf("Please select an option :");
scanf("%d",&opt);

if(opt==0)
break;
printf("Please enter the value : ");
scanf("%f",&inp);
if(opt==1)
result=add(result,inp);
if(opt==2)
result=sub(result,inp);
if(opt==3)
mul(&result,inp);
if(opt==4)
divi(&result,inp);
printf("result =%f\n",result);
}
}
int main()
{
claculator();

return 0;
}