Simple Calculator with If Else or Nested If Else in C Programing

Simple Calculator with If Else in C Programming is one of the very good practices for nested if else.

Program Explained(Logic):

In this program, the main Logic of Do While Loop is to get inputs and do calculations as many times as required.

And loop will terminate only when 'n' is Entered by the user. 

Source Code:

#include <stdio.h>
#include<stdlib.h>
int main(){    
float x,y;    
char operator,again;    
do{    
printf("Enter two numbers\n");    
scanf("%f %f",&x,&y);    
printf("Enter + to add\nOr Enter - to subtract\nOr Enter / to  Divide\nOr Enter * to Multiply\n");    
fflush(stdin);  
scanf("%c",&operator);    
if (operator=='+')    
{

       printf("\nSum=%f\n",x+y);

 }
  else if (operator=='-')    
{

      printf("\nDiffrence=%f\n",x-y);

 }  
  else if (operator=='/')    
{

      printf("\nDivision=%f\n",x/y);

 }   
 else if (operator=='*')   
 {

      printf("\nMultiplication=%f\n",x*y);

  }   
 else    
{

      printf("\nInvalid Entry");

 } 
   printf("press y to again use it and n to exit");  
  scanf("%c",&again); 
  } while(again=='y'&& again!='n');    
printf("%c",again);  
getchar();
return 0;
}

Note:

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