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>

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

     Girfa Student Help

     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;

Answer :July 2019 Introduction to ICT Resources

Answer : NIELIT (O-Level) July 2019  Introduction to ICT Resources

1. Multiple Choice

1.1 : B
1.2 : A
1.3 : C
1.4 : D
1.5 : C
1.6 : A
1.7 : A
1.8 : B
1.9 : C
1.10 : C