C Program to Print all Negative Elements in Array

Ex: Write a C program to print all negative elements in array. How to write a C program which print all negative elements in array. C program to print all negative elements in array.


Input from user:

Enter the limit: 5

Enter the numbers:
10
-3
12
-9
-2

Expected output:

Negative elements are:
-3
-9
-2

C Program to print Sum of All Array Elements

Ex: Write a C program to print sum of all array elements. How to write a C program which print sum of all array elements. C program to print sum of all array elements.


Input from user:

Enter how many elements you are going to enter: 5

Enter the elements:
10 
20 
30 
40
50

Expected output:

Sum of all array elements= 150

Array in C Definition, Syntax, Working, Advantages & Disadvantages

Definition: Array is collection of similar data types. That means using array we can store similar type of elements.


In short array is  a variable which can store multiple values. For example, if you want to store 100 and more intigers, then you need to create an array for it.


Syntax:

Ex: Write a C program for swap two numbers using function. How to write a C program for swap two numbers using function. C program for swap two numbers using function.

Input from user:

Enter two numbers: 10 20

Expected output:

Numbers before swap:
number1=10
number2=20

Numbers after swaping:
number1=20
number2=10

  Step by step logic of the given program:

1. First declare function give it meaningful name swap().

2. Inside the main() accept input (two numbers) from user declare two varibles say no1 & no2 .

3. After that pass two values to the function using- swap(no1,no2) (calling the function).


5. In the body of swap()  declare third variable temp and swap the values using-
temp=a;
a=b;
b=temp;

5. After that print swaped values to the output screen.

  C program for swap two numbers using functions:

#include<stdio.h>
int swap(int,int);

int main()
{
int no1,no2;

printf("Enter two numbers:\n");
scanf("%d%d",&no1,&no2);

printf("Numbers before swap:\nnumber1= %d\nnumber2= %d",no1,no2);

swap(no1,no2);

}

int swap(int a,int b)
{
int temp;

temp=a;
a=b;
b=temp;

printf("\n\nNumbers after swap:\nnumber1=%d\nnumber2=%d",a,b);

return 0;

}



Above program shows the following output:

Ex: Write a C program to print square of given number using function. How to write a C program to print square of given number using function. C program to print square of given number using function.

Input from user:

Enter the number: 4

Expected output:

Square of given number is= 16.0000

  Step by Step logic of the given program:

1. First declare function give it meaningful name square().

2. Inside the main() accept input (number) from user declare varible say no.

3. Call the square() inside the printf() directly (It will print returned value means square of given number).

4. In the body of square() use simple logic of square which is-
Square=no*no;

5. After that return square.

  C Program to print Square of given Number using Function:

#include<stdio.h>
float square(float);

int main()
{
float no;
printf("Enter the number: ");
scanf("%f",&no);

printf("Square of given number is= %f",square(no));
}
float square(float no)
{
float square=no*no;
return square;
}


Above program shows the following output:

C program to check given number is prime or not using function

Ex: write a C program to check given number is prime or not using function. How to write a C program to check given number is prime or not using function. C program to check given number is prime or not using function.


Input from user:

Enter the number: 5

Expected output:

Given number is prime number.

  Step by Step logic of the given program:

1. First declare function give it meaningful name prime().

2. Inside the main() accept input (number) from user declare varible say no.

3. Using if statement call prime function- if(prime(no)). after that inside the if statement print given number is prime otherwise print number is not prime. (If returned value is 1(true) then it will print number is prime otherwise it will execute else block. 

4. After that inside the prime() we will use following prime numbers logic-
for(i=1;i<=no;i++)
{
if(no%i==0)
{
count++;
}
}

Here, count will be 2 only if number is prime.

5. In the last check count is 2 or not using- if(count==2) 
If it's true return 1 otherwise return 0;

  C program to check given number is prime or not using function:

#include<stdio.h>
int prime(int);
int main()
{
int no;

printf("Enter the number\n");
scanf("%d",&no);

if(prime(no))
    {
    printf("Given number is prime number");
    }
    else
    {
    printf("Given number is not prime number");
    }
}
int prime(int no)
{
int count=0,i;

for(i=1;i<=no;i++)
{
if(no%i==0)
{
count++;
}
}
if(count==2)
{
return 1;
}
else
{
return 0;
}
}


Above program shows the following output:

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C program to print sum of two numbers using functions

Ex: Write a C program to print sum of two numbers using function. How to write a C program to print sum of two numbers using function. C program to print sum of two numbers using function.

Input from user:

Enter two numbers: 35 15

Expected output:

Sum = 50

  Step by step logic of the given program:

1. First declare function give it meaningful name add().

2. Inside the main() accept input (two numbers) from user, declare two varibles say no1 & no2 .

3. inside the sum pass no1 and no2 to the function using: sum= add(no1, no2);

4. After that print sum.

5. In the body of add() add n1 and n2 and store it some varible say sum.


After that return sum.






  C program to print sum of two numbers using functions:

#include<stdio.h>
int add(int n1,int n2); /*function declaration*/

int main()
{
    /*Variable declaration*/
    int no1,no2, sum;

    /*Input two numbers from user*/
    printf("Enter two numbers: ");
    scanf("%d%d", &no1,&no2);

    
    sum=add(no1, no2);

    /*Print value of sum*/
    printf("Sum = %d",sum);

    return 0;
}


int add(int n1,int n2)
{
    int sum= n1+n2;

    /*Return value of sum to the main*/
    return sum;
}


Above program shows the following output:

C program to print factorial of given number using function

Ex: write a C program to print factorial of given number using function. How to write a C program to print factorial of the given number using function. C program to print factorial of given number using function.

Input from user:

Enter the number: 5

Expected output: 

Factorial of given number is 120.


In this program we will used recursion function
to find factorial of given number.
In short recursion function means- function calling it self that means call a function inside the same function then it is called a recursive call of the function.

  Step by step logic to print factorial of given number using function:

1. First declare function give it meaningful name fact().

2. Inside the main() accept input (number) from user declare variable say no.

3. Call the fact() inside the printf() directly (It will print returned value means factorial of given number).

4. In the body of fact() use  one if statement to check number is less than 1. If it is less than or equal to 1 return 1.

5. Otherwise use following factorial logic no=no*fact(no).

After that return no.

  C program to print factorial of given number using function:

#include<stdio.h>
int fact(int no);
void main()
{
int no;

printf("Enter the number\n");
scanf("%d",&no);

printf("Factorial of given number is %d",fact(no));
}
int fact(int no)
{
   if(no<=1)
   {
    return 1;
   }
   else
   {
    no=no*fact(no-1);
    return no;
   }
}

Above program shows the following output:

Ex: write a C program to print given number is even or odd using function. How to write a C program to print given number is even or odd using function. C program to print given number is even or odd using function.


Input from user:

Enter the number: 24

Expected output:

Given number is even

  Step by step logic of the given program:

1. First declare function give meaningful name say even().

2.  Inside the main() accept input(number) from user, declare varible say no.

3.  Call function and store returned value in variable r.

4.  If  returned value is 0 if(r==0) print is even otherwise print is odd.

5. inside the function check number is even or odd using if(no%2==0) return 0 else return 1.

  C program to print given number is even or odd using function:

#include<stdio.h>
int even(int);

int main()
{
int no,r=0;
printf("Enter the number\n");
scanf("%d",&no);

r=even(no);

if(r==0)
printf("Given number is even");
else
printf("Given number is odd");
}
int even(int no)
{
if(no%2==0)
{
return 0;
}
else
{
return 1;
}
}

Above program shows the following output:

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Function's in C with there syntax, advantages & types

Definition: Function is a self-contained block of statement that perform a coherent tasks. using function  we can divide a large program into the basic building blocks.

There are many functions we are used already such as- printf(), scanf(), pow(), sqrt() and most important function is main().

  Types of function's:

There are two types of function's.

1. Standard library functions.
2. User-defined functions.

1. Standard library functions:  functions which already have a definition in header files(like stdio.h) this type of functions are called standard library functions. Which are printf(), scanf(), puts(), gets() etc. 

2. User defined functions: The functions that we create in a program this type of functions are called as user defined functions.

In this tutorial we will learn how works user defined functions.

Syntax:

 return_type function_name (argument list)
 {
 // block of statements
 }

• How It works?:

1.Return type: means  datatype such as int, double, char, float, void, short etc.

2.Function name: you can give any name to function. But to understand easily we will give meaningful name to functions.

3.Argument list: It contains variable names with there data types.


4.Block of statement/code: It will be executed whenever a call will be made to the function.

   Advantages of user defined functions:

1. The program will easier to understand by using functions.

2. It makes possible top down modular programming.

3. The length of the program can be reduced by using functions.

4. Large programs we can divide into  smaller modules using functions.

  Example program of user defined function:

Below program shows the working of the user defined functions.


#include<stdio.h>

void function();//function prototype declaration

void main()

{

 printf("Hii from main()\n");

 

 function();//function calling

}

void function()//function definition

{

 printf("Hii from user defined function");

}

Above program shows the following output: