By | 23.03.2017

# C Program to raise float to power integer by Recursion and Iteration

Write a C Program to raise float to power integer by Recursion and Iteration. Here’s simple Program to raise float to power integer using Recursion and Iteration in C Programming Language.

## Recursion : :

• Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
• The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
• Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

## Iteration : :

• Iteration, in the context of computer programming, is a process wherein a set of instructions or structures are repeated in a sequence a specified number of times or until a condition is met.
• When the first set of instructions is executed again, it is called an iteration. When a sequence of instructions is executed in a repeated manner, it is called a loop.

Example : :

for (int i=0;i<n;i++)
{
\\ statements;
}

Below is the source code for C Program to raise float to power integer by Recursion and Iteration which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/* Program to raise float to power integer*/

#include<stdio.h>
float power(float a , int n);
float Ipower(float a , int n);
int main( )
{
float a, p;
int n;
printf("Enter base : ");
scanf("%f", &a);
printf("Enter power : ");
scanf("%d", &n);
p = power(a, n);

printf("\nUsing Recursion ::\n ");
printf("%f raised to power %d is %.2f\n", a, n, p);
p = Ipower(a, n);
printf("\nUsing Iteration ::\n ");
printf("%f raised to power %d is %.2f\n", a, n, p);

return 0;

}/*End of main()*/

/*Recursive*/
float power(float a , int n)
{
if(n == 0)
return(1);
else
return(a * power(a,n-1));
}/*End of power()*/

/*Iterative*/
float Ipower(float a , int n)
{
int i;
float result=1;
for(i=1; i<=n; i++)
result = result * a;
return result;
}/*End of Ipower()*/```

### OUTPUT  : :

```//***************** OUTPUT *********************

//***************** FIRST RUN ******************

Enter base : 5
Enter power : 4

Using Recursion ::
5.000000 raised to power 4 is 625.00

Using Iteration ::
5.000000 raised to power 4 is 625.00

//***************** SECOND RUN ******************

Enter base : 12.5
Enter power : 3

Using Recursion ::
12.500000 raised to power 3 is 1953.13

Using Iteration ::
12.500000 raised to power 3 is 1953.13```

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