Earn while u Learn

printf() is a standard output function of C. It is used to display outputs generated by a program on the screen.
            Syntax:   printf(" [ message ] [conversion specifier] [escape sequences]",[variable list>/[expression>);
             Ex: printf("welcome to www.a2zhacks.blogspot.com ");
    the above statement will display a message Welcome to www.a2zhacks.blogspot.com  on the screen
Example:  #include
               main()
               {
                int x=67;
                printf(" The value of x = %d",i);
                }
the output of the above code is The Value of x = 67.

scanf() this is a standard input function of C. This function is used to accept any value or store in the given address of the specified variable according to the conversion specifier.
syntax:   scanf("[conversion specifier list]",[&var1,&var2,&var3.....]);
example:
#include
main()
{
int x;
printf("Enter a number");
scanf("%d",&x);
printf("The number you entered is  %d ",x);
getch()
}
the output will be that you will be asked a number and then the number will be stored in x and you will get a message that the number you entered is 123.