Design a calculator to perform arithmetic operations such as addition, subtraction, multiplication, and division.

Design a calculator to perform arithmetic operations such as addition, subtraction, multiplication, and division. 

Sample command line Input 

12 33 + 

Sample Output 

45 

Sample command line Input 

12 3 * 

Sample Output 

36 

Implementation of above problem:

#include <stdio.h>

#include <stdlib.h>

#include <string.h> 

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

{

int a,b,result;

char opr[10];     

if(argc<4){

printf("Some parameters are missing\n");

printf("use prg_name opr value1 value2\n");

return -1;

}   

//getting operator

strcpy(opr,argv[3]);

//getting values from arguments

a=atoi(argv[1]);

b=atoi(argv[2]);         

switch(opr[0]){

case '+':

result=a+b;

break;

case '-':

result=a-b;

break;

case '*':

result=a*b;

break;          

case '/':

result=a/b;

break;    

 default:

printf("Invalid Operator!!!\n");

return -1;

}

printf("\n%d",result);

return 0;

}

Thanks

Mukesh Rajput