**C program to calculate the average of two numbers** has been shown here. Average of two numbers is described by the sum of those numbers divided by 2. Suppose $a$ and $b$ are two numbers, then the average is calculated as $\frac{a+b}{2}$. For example if the two numbers are 5 and 6, the average is (5 + 6)/2 = 5.5.

## 1. Algorithm to Calculate the Average of Two Numbers

1. Take two numbers *a* and *b* as inputs

2. Compute *x = (a + b)/2 *

3. Declare *x* as the average and exit program

## 2. Pseudocode to Calculate the Average of Two Numbers

**Input**: Two numbers $a$ and $b$

**Output**: Average of $a$ and $b$

1. **Procedure** average($a$, $b$):

2.

3. ** Return** $x$

4. **End Procedure**

## 3. Time Complexity to Calculate the Average of Two Numbers

**Time Complexity:** **O(1)**

## 4. C Program to Calculate the Average of Two Numbers

/************************** alphabetacoder.com C Program to calculate the average of two numbers ***************************/ #include <stdio.h> int main() { // declare variables float a, b, x; //take input of the numbers printf("Enter the first number = "); scanf("%f", & a); printf("Enter the second number = "); scanf("%f", & b); // calculate average x = (a + b) / 2; // display the result printf("Average of %f and %f is %f", a, b, x); return 0; }

Output

Enter the first number = 12.5

Enter the second number = 10

Average of 12.500000 and 10.000000 is 11.250000