2. Algorithms and first program in C

 #Some important:

*/……*/. – It is not considered a program. 

#include<stdio.h> – Header file used

main(){    – it is a beginning for program

printf – it is  function used to input

scanf – it is function  used to  output

Input : input means to provide a program with some data to be used in the program.

Output : output means to display data on screen or writer the data to a printer or a file .

& it is a Address operator 

return 0  end of the program

Compiler	int	float	double	char
16-bit	2 byte	2	4	1
32 -bit	4 byte	4	8	1
64-bit	8 byte	8	16	1

Note:- ASCII  value of upper case : 65 to 90

  ASCII value of lower case : 97 to 122

Arithmetic instruction : 

Multiplication	*
Subtraction	-
Addition	+
Division	/
Modulus	%
Assignment	=

ALGORITHMS : 

Step by step solution of a given problem written in an ordinary language like English.

 Algorithm : To find addition of two numbers 

 Input         : two numbers a and b

 Output      : addition of two numbers a and b

• Step 1 − START.

• Step 2 − input a and b

• Step 3 − define values of a & b.

• Step 4 − add values of a & b.

• Step 5 − store output of step 4 to c.

• Step 6 − print c.

• Step 7 − STOP

FIRST C PROGRAM :

#include<stdio.h>


int main() {


    printf("Hello world");


    return 0;

}

OUTPUT: Hello world