main() scanf() printf()

What is main( )

Main () is a function or we often say a set of statement in C program. It is the main function in c program from where the compiling starts. The Main () is library function so its name cannot be change.

What is printf()

It is the instruction based keyword in C used to display output on the screen. It is a library function. To be able to use printf() function, it is necessary to use #include<stdio.h> header file this is done by typing the #include<stdio.h> at the top of program.

The general form of printf() function is:

Printf(“Type to print“);

What is scanf()

It is use to grasp the value from user. It is necessary to use #include<stdio.h>  header file this is done by typing the #include<stdio.h> at the top of program.

The general form of scanf() function is:

Scanf(“%d %f %c”,&a,&b,&c);

%d (used for integers) %f (used for real) and %c (used for character) is used to indicate the datatype which is written between “ “ and use & (ampersand) before variables indicates the address of variables.

A scanf statement when scan two variables from user in a single statement
i.e.
scanf("%d,%d",&a,&b);
or
scanf("%d %d",&a,&b);
or
scanf("%d      %d",&a,&b);
two data types are separated by space or comma or tab