Intoduction To Boolean Variable On C Programming Language

Boolean variable has only True or False value. To make program use boolean variable can be used if... else... statement

Example of its program as follows:

1. Boolean without variable
   • Example we want to make program, if a statement valued true then program will show A letter.
     
     main()
     {
       if (1<2)
       {
         printf("A");
       }
       getch();
     }
     
     
   • On program syntax above, statement valued true, because correct 1<2. But if statement is made be false, example by declaring 1>2, so that program syntax becomes:
     
     main()
     {
       if (1>2)
       {
         printf("A");
       }
       getch();
     }
     
     then program syntax will not show A letter when program is run, please try.
     
     
   • Now we will make program, if a statement valued true, then program will show A letter, but if not (if statement valued false) then program will show B letter
     
     

     main() {   if (1<2)   {     printf("A");   }   else   {     printf("B");   }   getch(); }

     main() {   if (1>2)   {     printf("A");   }   else   {     printf("B");   }   getch(); }

     
     
2. Boolean use integer variable
   • If a statement valued true then program will show A letter
     
     main()
     {
       int num1,num2;
       num1=1; num2=2;
       if (num1<num2)
       {
         printf("A");
       }
       getch();
     }
   
   
   • If a statement valued false then program will not show A letter
     
     main()
     {
       int num1,num2;
       num1=1; num2=2;
       if (num1>num2)
       {
         printf("A");
       }
       getch();
     }
   
   
   • If a statement valued true then program will show A letter, if not program will show B letter
     
     

     main() {   int num1,num2;   num1=1; num2=2;   if (num1<num2)   {     printf("A");   }   else   {     printf("B");   }   getch(); }

     main() {   int num1,num2;   num1=1; num2=2;   if (num1>num2)   {     printf("A");   }   else   {     printf("B");   }   getch(); }



3. Boolean use character char variable, not integer char
   • If a statement valued true then program will show A letter
     
     main()
     {
       char character1,character2;
       character1='s'; character2='i';
       if (character1 != character2)
       {
         printf("A");
       }
       getch();
     }
   
   
   • If a statement valued false then program will not show A letter
     
     main()
     {
       char character1,character2;
       character1='s'; character2='i';
       if (character1 == character2)
       {
         printf("A");
       }
       getch();
     }
   
   
   • If a statement valued true then program will show A letter, if not program will show B letter
     
     

     main() {   char character1,character2;   character1='s'; character2='i';   if (character1 != character2)   {     printf("A");   }   else   {     printf("B");   }   getch(); }

     main() {   char character1,character2;   character1='s'; character2='i';   if (character1 == character2)   {     printf("A");   }   else   {     printf("B");   }   getch(); }

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