program to display all even numbers lying 1 and 200 using function.

using codeblocks
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//program to display all even numbers lying 1 and 200 using function.
#include<stdio.h>                      //header file
void even_number();                          // function prototype/declaration with return type zero.
int main()                              //main function
{
even_number();                                     // function calling.
return 0;                                       //returns 0 value
}
void even_number()                              // function body line ; also called function definition
{
 int i;                    // variable declaration
for(i=0;i<=200;i=i+2)       //loop running from 0 to 200 with increment 2 each time
{
    printf("%d\n",i);           // displaying all the numbers
}
     
}

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program to get square root of a number using function.

using codeblocks
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//program to get  square root of a number using function.
#include <stdio.h>  //header file
#include<math.h>
void square_root();//function prototype
int main()                 //main function
{
    square_root();          // function calliing
    return 0;             // returning 0 value
}

void square_root()      //function body line/definition
{
    float n,square;       // initilizating value 1
    printf("enter value");// display of those value
    scanf("%f",&n);
   
        square=sqrt(n);            // finding sum of two numbers
        printf("square root=%f\n",square);//display of that sum
     
}
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using turbo c++
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//program to get  square root of a number using function.
#include <stdio.h>  //header file
#include<math.h>
#include<conio.h>
void square_root();//function prototype
void main()                 //main function
{
    square_root();          // function calliing
    getch();             // holds the output
}

void square_root()      //function body line/definition
{
    float n,square;       // initilizating value 1
    printf("enter value");// display of those value
    scanf("%f",&n);
   
        square=sqrt(n);            // finding sum of two numbers
        printf("square root=%f\n",square);//display of that sum
     
}

program to get Fibonacci series 1,1,2,3,5,8,.... 20th term.

using codeblocks
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//program to get Fibonacci series 1,1,2,3,5,8,.... 20th term.

#include <stdio.h>  //header file
void fibonacci();//function prototype
int main()                 //main function
{
    fibonacci();          // function calling
    return 0;             // returning 0 value
}

void fibonacci()      //function body line/definition
{
    int a=1,b=1,c,i;       // initializing value 1
    printf("%d\n%d\n",a,b);// display of those value
    for(i=1;i<=18;i++)     // running loop for 18 times
    {
        c=a+b;            // finding sum of two numbers
        printf("%d\n",c);//display of that sum
        a=b;             //assigning b to a and c to b.
        b=c;
    }
}


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using turboc++
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//program to get Fibonacci series 1,1,2,3,5,8,.... 20th term.

#include <stdio.h>  //header file
#include<conio.h>//header file
void fibonacci();//function prototype
int main()                 //main function
{
    fibonacci();          // function calling
    getch();             //holds the output
}

void fibonacci()      //function body line/definition
{
    int a=1,b=1,c,i;       // initializing value 1
    printf("%d\n%d\n",a,b);// display of those value
    for(i=1;i<=18;i++)     // running loop for 18 times
    {
        c=a+b;            // finding sum of two numbers
        printf("%d\n",c);//display of that sum
        a=b;             //assigning b to a and c to b.
        b=c;
    }
}

program to get reverse of a number using function

using codeblocks
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//program to get reverse of a number using function

#include<stdio.h>                      //header file
void reverse();                          // function prototype/declaration with return type zero.
int main()                              //main function
{
reverse();                                     // function calling.
return 0;                                       //returns 0 value
}
void reverse()                              // function body line ; also called function definition
{
int rem;                             //initialization to value 1
 int n;                                       // variable declaration
 printf("enter a number\n");
 scanf("%d",&n);                            //input
for(;n!=0;)                     //loop running from 1 to 100 with increment 1 each time
{
    rem=n%10;               //finding remainder
    printf("%d",rem);       //output
    n=n/10;                 //finding next integer number and trasnforming that into 'n'
}
   

}
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using turboc++
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//program to get reverse of a number using function
#include<stdio.h>                      //header file
#include<conio.h>
void reverse();                          // function prototype/declaration with return type zero.
void main()                              //main function
{
reverse();                                     // function calling.
getch();                                       //holds the output.
}
void reverse()                              // function body line ; also called function definition
{
int rem;                             
 int n;                                       // variable declaration
 printf("enter a number\n");
 scanf("%d",&n);                            //input
for(;n!=0;)                     //loop running until its value reaches 0 each time
{
    rem=n%10;               //finding remainder
    printf("%d",rem);       //output
    n=n/10;                 //finding next integer number and trasnforming that into 'n'
}
   

}

program to get factorial value of a number using function

using codeblocks
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//program to get factorial value of a number using function
#include<stdio.h>                      //header file
void factorial();                          // function prototype/declaration with return type zero.
int main()                              //main function
{
factorial();                                     // function calling.
return 0;                                       //returns 0 value
}
void factorial()                              // function body line ; also called function definition
{
int factorial_value=1,i;                             //initialization to value 1
 int n;                                       // variable declaration
 printf("enter a number\n");
 scanf("%d",&n);                            //input
for(i=1;i<=n;i++)                     //loop running from 1 to 100 with increment 1 each time
{
    factorial_value=factorial_value*i;                //formulation for factorial
}
printf("factorial=%d\n",factorial_value);      //output
}
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using turboc++
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//program to get factorial value of a number using function
#include<stdio.h>                      //header file
#include<conio.h>
void factorial();                          // function prototype/declaration with return type zero.
void main()                              //main function
{
factorial();                         // function calling.
getch ();                                       //holds the output
}
void factorial()                              // function body line ; also called function definition
{
int factorial_value=1,i;                             //initialization to value 1
 int n;                                       // variable declaration
 printf("enter a number\n");
 scanf("%d",&n);                            //input
for(i=1;i<=n;i++)                     //loop running from 1 to 100 with increment 1 each time
{
    factorial_value=factorial_value*i;                //formulation for factorial
}
printf("factorial=%d\n",factorial_value);      //output
}
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/* here we have used top down approach. i.e calling from top and writing its body line down.
 we can also reverse the process.*/

program to get sum of 1,2,3,4,5,.............100 using function

using codeblock
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//program get sum of  1,2,3,4,5,.............100 using function
#include<stdio.h>                      //header file
void sum_series();                          // function prototype/declaration with return type zero.
int main()                              //main function
{
sum_series();                                     // function calling.
return 0;                                       //returns 0 value
}
void sum_series()                              // function body line ; also called function definition
{
int sum=0;           //initialization of sum to zero
 int i;                    // variable declaration 
for(i=1;i<=100;i++)       //loop running from 1 to 100 with increment 1 each time
{
    sum=sum+i;           // summing all the numbers repetitively
}
printf("sum=%d\n",sum);      //output
}


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using turboc++
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//program get sum of  1,2,3,4,5,.............100 using function
#include<stdio.h>                      //header file
#include<conio.h>
void sum_series();                          // function prototype/declaration with return type zero.
void main()                              //main function
{
sum_series();                                     // function calling.
getch();                                       //returns 0 value
}
void sum_series()                              // function body line ; also called function definition
{
int sum=0;           //initialization of sum to zero
 int i;                    // variable declaration 
for(i=1;i<=100;i++)       //loop running from 1 to 100 with increment 1 each time
{
    sum=sum+i;           // summing all the numbers repetitively
}
printf("sum=%d\n",sum);      //output
}

/* here we have used top down approach. i.e calling from top and writing its body line down.
 we can also reverse the process.*/