Adding two Numbers

To add two numbers we will simply just create three variables, two for  the numbers and one for the result. See example






         int main()

         {
                        int a=10, b=5, c;      \\ We can also create many variables in the same line
                        c = a + b;                \\ The equal sign we put the right side value to left side
                        printf("%d",c);
                        return 0;
         }

               In last line we are printing the value of C named variable to print a integer variable's value
               we use '%d' for others just scroll down.
               
                  char         %c
                  string        %s
                  float           %f
                  double       %l

We can also take input from user with just using the scanf function. Scanf function simply take user's input and then can processing with it.



int main()
{
                 int a,b,c;
                 printf("Enter Two Number");  \\  giving message to the user by which he can understand                                                                           what he exactly has to do
                 scanf("%d %d",&a,&b);          \\ two %d for two variables
                 c = a + b;
                 printf("Sum = %d",c);
}

Here in first line we are giving message to the user by which he can  understand what input are allowed in this program. So a message should be always easy and simple to understafd.

A variable name must be meaningful or mnemonic type , means name should relate to its functionality. It is very important to do this for example if you have created a program a revising it after a long gap at this stage it may be possible that you can't understand that where you are using a particular variable.


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