Previous  Next Page

1.11 The Conditional Operator

expression1 ? expression2  :  expression3

The expression1 is evaluated first. If condition becomes true then expression2 is the result else expression3 is the result.
max   =   (num1>num2)   ?  num1   : num2;

1.12 The Sizeof Operator

It returns the length, in bytes, of the variable.


    #include<stdio.h>
    main()
    {
    float f;
    clrscr();
    printf("The Size of the f is %d\n", sizeof(f));
    printf("Size of double is %d\n", sizeof (double));
    }

1.13 The Comma Operator

The comma operator is used to string together several expressions.
 
a  =  (b  =  5,  b+2)  \;

1.14 C Shorthand

a  =  a+5;
can be written as a+=5;
a  =  a  *  b;
can be written as   a   *=  b;

1.15 Compiling and Running C Program.

Source Code   -----After compile----->  Object Code  ------ Run----> Executable Code
( .c)                                                              (.obj)                                                (.exe)
For compile  Alt + F9
Run    Ctrl +   F9   (Compile & Run )
Output   Alt  +   F5

2.1 If Statement

If the If expression becomes true then statement following the if statement is executed otherwise following the else statement is executed.

  #include<stdio.h>
  main()
  {
  int x, y;
  scanf("%d, %d", &x , &y);
  if(x>y)
  printf("The number %d is greater than %d\n", x,y);
  else
  printf("The number %d is greater than %d\n",y,x);
}

2.2 Switch Statement

The switch statement is multiway decision maker that tests the value of an expression against a list of integer or character constants. When a match found, the statement associated with that constant are executed. When match found then the statement executed and the program controls exit from the switch by break() statement.


 #include<stdio.h>
 main()
 {
 char ch;
 clrscr();
 printf("\n Enter an alphabet in lowercase (a-z):");
 scanf("%c", &ch);
 if(ch<'a' || ch> 'z')
 printf("\n Character is not an alphabet in lowercase") ;
 else
 switch(ch)
 {
 case 'a':
 case 'e':
 case 'i':
 case 'o':
 case 'u':
 printf("\nCharacter is a vowel"):
 break;
 case 'z':
 printf("\nLast Alphabet (z) was entered");
 default:
 printf("\ncharacter is a consonant");
 break;
 }
 }

2.3 The For Loop

The for loop continues to executes as long as the conditional test evaluates to true. When the condition becomes false, control is transferred to the statements after the for loop.

 #include<stdio.h>
 main()
 {
 int a;
 printf("The even numbers between 1 and 25 are :");
 for(a=2; a<=25; a+=2)
 printf("%d\n",a);
 }

2.4 The While Loop

 While loop is like for loop difference is that while loop check the condition at the beginning of the loop, which means that the loop code is not executed, if the condition is false at the start.


 #include<stdio.h>
 main()
 {
 int a;
 printf("The even numbers between 1 and 25 are :");
 while(a<25)
 {
 printf("%d\n",a);
 a+=2;
 }
 }

2.5 The Do While Loop

 Do While loop is similar to While loop difference only is that it check the condition after statement execution. so here statement executed at least single time. (if the condition become false or true in both cases)

 #include<stdio.h>
 main()
 {
 int a;
 printf("The even numbers between 1 and 25 are :");
 do
 {
 printf("%d\n",a);
 a+=2;
 }while(a<25);
 }

Previous  Next Page