Basic Examples

Basic Examples using different datatypes

1. To calculate area of a square when side is given
   #include
   #include
   void main()
   {
   clrscr();
   int side,area;
   side=4;
   area=side*side;
   printf("Area of the square is %d",area);
   }
2. To calculate area of a circle when radius is given
   #include
   #include
   void main()
   {
   clrscr();
   float radius,area;
   radius=5.6;
   area=3.14*radius*radius;
   printf("\nArea of the circle is %f",area);
   }
3. To calculate income tax of a person as 2% of his/her salary.
   #include
   #include
   void main()
   {
   clrscr();
   int salary;
   float tax,netsalary;
   salary=4000;
   tax=salary*2/100;
   netsalary=salary-tax;
   printf("\nTotal Salary %d",salary);
   printf("\nIncome Tax %f",tax);
   printf("\nNet Salary %f",netsalary);
   }
4. To print a char value
   #include
   #include
   void main()
   {
   clrscr();
   char c;
   c='G';
   printf("The alphabet is %c",c);
   }
   

Points to remember

• The header file is added for the clrscr() which clears the previous outputs from the screen. It can be omitted if we don't want to use clrscr().
• You can change the order of header files.
• "\n" is used to print the outputs on different lines. Removing \n will print all the messages in one line.
• %d is used whenever we want to print an integer value,%f is used to print a float(decimal) value while %c denotes a char variable.
• If we want to restrict the number of decimal positions to two we can add ".2" after the "%" sign in %f. For example, the statement
  printf("\nNet Salary %.2f",netsalary);
  will print only 2 decimal digits. Similarly we can %.3f or %.4f