Question

Write a C program that runs on ocelot for a mini calculator using only the command line options. You must use getopt to parse the command line.
Usage: minicalc [-a num] [-d num] [-m num] [-s num] [-e] value
• The variable value is the starting value.
• Value should be validated to be an integer between 1 and 99. Error message and usage shown if not.
• -a adds num to value.
• -d divides value by num.
• -m multiplies value by num.
• -s subtracts num from value.
• -e squares value. (Note: no num is needed.)
• Output should have exactly 2 decimal places no matter what the starting values are.
• If –e is included, it is executed first.
• Use standard order of operations for all operations.
Code should be nicely indented and commented. Create a simple Makefile to compile your program into an executable called minicalc.The Makefile should be called Makefile with no extension. I should be able to type make at the command line to compile your program.

Answer 1

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

int add( int ,int)

int div( int ,int )

int mul( int ,int )

int sub(int ,int )

int main()

{

int num1, num2, choice ;

printf("1.Addition\n2:Division\n3:Multipliication\n4:Substarction\n0:Exit\n enter your choice:");

scanf("%d",&choice);

switch(choice)

{

case 0:

return 0;

break;

case 1:

printf("enter the first number:\n");

scanf("%d",&num1);

printf("enter the second number:\n");

scanf("%d",&num2);

printf("%d",add(num1,num2));

break;

case 2:

printf("enter first number:\n);

scanf('%d",&num1);

printf("enter second number:\n);

scanf("%d",&num2);

printf("%d",div(num1, num2));

break;

case 3;

printf("enter first number:\n);

scanf("%d",&num1);

printf("enter second number:\n);

scanf("%d",&num2);

printf("%d",mul(num1,num2));

break;

case 4:

printf("enter first number :\n");

scanf("%d",&num1);

printf("enter second number:\n");

scanf("%d",&num2);

printf("%d",sub(num1,num2));

break;

default:

printf("this is not a valid choice");

break;

}

}

// Addition

int add(int a, int b)

{

int c=a+b;

return c;

}

//multiplication

int mul(int x, int y)

{

int z=x * y;

return z;

}

//division

int div(int i ,int j)

{

int k=i / j;

return k;

}

// substraction

int sub(int m, int n)

{

int l= m - n;

return l;

}