if else statement condition

Condition - is the state of an expression or a variable; for example, when a result can be either true or

                false, or not equal.

if else statement – this is a control statement that executes a block of code.

                Syntax:

                                if (condition)

                                                statement1;

                                else

                                                statement2;

scanf(); used to read information from the keyboard

scanf(“%f”)  float, scanf(“%c”) character & symbol

clrscr(); -is used to clear the text mode window or to clean the output screen before running a program.

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This program will input 2 numbers, using the ”if else statement”  you can use this following

operators ( +, -, /, *)

//Sample Program1:

#include<stdio.h>

#include<conio.h>

main()

{

int invalid_operator=0;

char oprtor;

float num1, num2, result;

printf(Enter two numbers and an operator?\n");

printf("number1 operator number2\n");

scanf("%f %c %f",&num1,&oprtor,&num2);

                 if(oprtor=='*')

                                                result=num1 *num2;

                 else if (oprtor=='/')

                                                result=num1/num2;

                 else if (oprtor=='+')

                                                result=num1+num2;

                 else if (oprtor=='-')

                                                result=num1-num2;

                 else

                                invalid_operator=1;

                                if(invalid_operator!=1)

                                printf("%f %c %f is %f\n",num1,oprtor,num2, result);

                                else printf("invalid operator");

getche();

return 0;

}

Sample output:

Enter two numbers and an operator

number1 operator number2

4.0000 + 2.0000 is 6.0000

Enter two numbers and an operator

number1 operator number2

4.0000 * 2.0000 is 8.0000