C Program to Add Two Integers

To understand this example, you should have the knowledge of the following C programming topics:

Program to Add Two Integers

``````#include <stdio.h>
int main() {

int number1, number2, sum;

printf("Enter two integers: ");
scanf("%d %d", &number1, &number2);

// calculate the sum
sum = number1 + number2;

printf("%d + %d = %d", number1, number2, sum);
return 0;
}
``````

Output

```Enter two integers: 12
11
12 + 11 = 23
```

In this program, the user is asked to enter two integers. These two integers are stored in variables number1 and number2 respectively.

``````printf("Enter two integers: ");
scanf("%d %d", &number1, &number2);
``````

Then, these two numbers are added using the `+` operator, and the result is stored in the sum variable.

``````sum = number1 + number2;
``````

Finally, the `printf()` function is used to display the sum of numbers.

``````printf("%d + %d = %d", number1, number2, sum);
``````

Before we wrap up, let's put your understanding of this example to the test! Can you solve the following challenge?

Challenge:

Write a function to add 10 to a given number.

• For example, with input `num = 5`, the return value should be 15.
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