Programming in C lecture 5 (Book)

Decisions

Decisions are taken by us in
our daily life, so a program without decision is an empty box.

 

Keyword If
()and else

To add decisions in any C
program we can use the key word “If()”and “else ()”and you can also use if in an if and else in else but with
the C style

We
can also use”&&” for saying compiler “and” and for saying compiler or
we can use “or”

Structure
of if and else statement

The structure of if
statement is as follow:

 

if (your condition here) if you want to use “&&”
type  ((condition1 here) && (and
2 here)) and if you want to use “or” replace && with “or”

{

Statement
1 here ;

 

}

 

else

{

Statement
2 here ;

 

}

Our first decisions program

              #include <iostream.h>

 

              main ()

              {

                   int ho;

                   cout <<"how many
years old are you?" <<"\n" ;

                   cin >> ho;

                  

                   if (ho >= 18)

                   {

                          

                          cout <<
"you can play foot ball easily";

                          }

                      else

                      {

                          cout <<
"you can't play football";

                           

                            }

 

              }

Note:

You
can also use these programs by using operators. If you have any doubt you can
add pretences. Eg after declaring variables you can just type x=4 + y then the
x value will be 4+y’s value (but in the C’s typing style)