Actual and former parameter C Language

As we know C language is building block of function. Anything done in C language by function. Function can take argument. There are two types of argument given below.

• Argument pass while calling is actual
• Argument while declaring function is former

#include<stdio.h>

#include<conio.h>

/*##########################

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     Formal and actual parameter program

  ##########################*/

int sum(int,int);

void main()

{

     int a,b,c;

     clrscr();

     a=10;

     b=20;

     c=sum(a,b);   /* a and b are actual parameter */

     printf("\n\tA=%d\n\tB=%d\n\tSum=%d",a,b,c);

     getch();

}

int sum(n1,n2) /* n1,n2 are formal parameter */

{

     return n1+n2;

}

In the function main in the example above, a, and b are all actual parameters when used to call calculate sum function. On the other hand, the corresponding variables in sum_funcation definition (namely n1, n2) are all formal parameters because they appear in a function definition.

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Difference between function definition and function declaration

Difference between  function definition and function declaration

DECLARATION	DEFINITION
A variable or a function can be declared any number of times	A variable or a function can be defined only once
Memory will not be allocated during declaration	Memory will be allocated
int f(int); The above is a function declaration. This declaration is just for informing the compiler that a function named f with return type and argument as int will be used in the function.	int f(int a) {   return a; } The system allocates memory by seeing the above function definition.

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Decimal to Binary conversion C language

Q : Write a C Program using function to print equivalent binary number of decimal number input by keyboard ?

Answer : 

#include<stdio.h>

#include<conio.h>

/*##########################

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     Decimal to Binary conversion

  ##########################*/

void main()

{

     int d,b,ar[10],i;

     clrscr();

     printf("Enter number> ");

     scanf("%d",&d);

     i=0;

     while(d>0)

     {

          ar[i]=d%2;

          d=d/2;

          i++;

     }

     i--;

     while(i>=0)

     {

          printf("\t%d",ar[i]);

          i--;

     }

     getch();

}

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Second Highest number from array using C language

Q : find second largest number from 1D array of n numbers.

Answer : 

#include<stdio.h>

void main()

{

     int n1,n2,ar[5],i;