Explanation of First C Program:-

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1) #include<stdio.h>
2) #include<conio.h>

3) void main()

4) {
5) int a = 190;

6) clrscr();

7) printf("%d\n",a);

8) getch();

9) }

Explanation:-

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Line 1: 

"stdio.h" is a header file. It is the abbreviation of Standard Input Output Header File. It contains the prototypes of printf() and scanf() functions.

Line 2: 
"conio.h" is a header file. It is the abbreviation of Console Input Output Header File. It contains the prototypes of clrscr() and getch() functions.

Line 3: 
"void main()" =>  is the main function. Every C program has only and only one such function.

Line 4 and Line 9:
 "{" =>  is called opening brace and "}" is called the closing brace. Between them, we write the statements of the function.They are used to enclose the statements of loops and conditional statements.
 
Line 5:
"int a;" =>  declares 'a' as a variable of integer data type, with a
value of 190. int is short word for integer. Notice the semi colon at the end, it is important.


Line 6: 
"clrscr();" => is the short for "clear screen". It is used to clear the screen.

Line 7: 
"printf("%d\n",a);" => This line uses printf function. The 'f' in printf stands for 'format'. %d is the format string to print integers.The 'a' after the comma is the variable 'a' which we declared in line 5. \n is an escape sequence used to insert a new line.

Line 8:
 "getch()" => This line uses getch() function. 'getch()' stands for get character. It is a console oriented function.