function

 // functions are besic tools by using them we will be able to

break our programme in small segments.

// funtion can be called multiple times and can provide our

c programme reusebility & modularity.

// function is also known as subroutine and procedure.

because by using this we break intire routine into small

sub-routine.

// we can avoid logic rewriting through function.

// we can devide wrok among programmer using functions.

// we can easily debug programme by finding the function

with error.

// function with bug will needed to debug and rest won't

need to be change.

// declaration, defining & calling a function.

// A function is declared to tell the compiler about its existence.

// declaration of a function is the process of calling

the compiler about it's existence.

(compiler ko function ke bare me batana)

// A function is defined to get some task done.

(It means when we define function we write

whole code of that function. In this actual implementation

of function is done.)

// (exectly function {code} he kya)

// defining a function is to get some certain task done

// A function is called in order to be used.

// (function ko use hone ke liya bulana)

// calling a function is to use it.

// types of function 1.library function 2.user defined function

// library functions are predefined functions of a programming

language.(basiclly include in header files)

// user defined function also known as created by user function

to reduse the hustle & complexcibility of a c-programme.

// besic function code example

// 1.without argument(condition,input) and return value.

// 2.with argument (condition,input) but without return value.

// 3.without argument (condition,input) but with retuen value.

// 4.with argument (condition,input) and return value.

#include <stdio.h>

int sum(int a, int b); // with argument and return value.

void printstar (int n);//without argument but retuen value.

int takenumber();//with argument but without return value.

void myname()

{

    printf ("my name is hemansh");

}

int main()

{

    int a,b,c,d,n;

    a = 46;

    b = 34;

    c = sum(a,b);

    // d=takenumber();

    // printstar(1);

    // printf ("he sum is %d",c);

    // printf ("The number entered is %d.",d);

    myname();

    return 0;

}

 int sum(int a, int b)

{

    return a+b;

}

 void printstar (int n)

{

    for (int i = 0; i < n; i++)

    {

        printf ("%c",'*');

        // ""ke ander string & ''ke andar character

lete he.

       

    }

}

 int takenumber()

{

    int i;

    printf ("Enter a number: \n");

    scanf ("%d", &i);

    return i;

}

//additional

#include <stdio.h>

void name()

{

    printf ("My name is Hemansh.\n");

   

}

void printhash (int n)

{

    int i;

    for ( i = 0; i < n; i++)

    {

        printf ("%c\n",'#');

    }

   

}

int enternum()

{

    int num;

    printf ("enter a number: \n");

    scanf ("%d",&num);

    return num;

}

int sumnum()

{

    int a;

    int b;

    printf ("Enter the first number: ");

    scanf ("%d", &a);

    printf ("Enter the second number: ");

    scanf ("%d", &b);

    return a+b;

}

int main()

{

    name();

    printhash(4);

    int c;

    c=enternum();

    printf ("The number entered is %d.\n",c);

    int a,b,d;

   

    d = sumnum(a,b);

    printf ("The sum is %d.\n",d);

   

    return 0;

}

output:_

My name is Hemansh. # # # # enter a number: 23 The number entered is 23. Enter the first number: 81 Enter the second number: 256 The sum is 337.