Here is a simple C program that calculates the value of the expression `sumN(3456) - sumN(3455)`. The function `sumN()` calculates the sum of all integers from 1 to `n`. ```c #include // Function to calculate sum of first n numbers int sumN(int n) { return n * (n + 1) / 2; } int main() { int num1, num2; // Get the input from the user printf("Enter the first number: "); scanf("%d", &num1); printf("Enter the second number: "); scanf("%d", &num2); // Calculate the value of the expression int result = sumN(num1) - sumN(num2); printf("The result is: %d ", result); return 0; } ``` In this program, the user is asked to enter two numbers. The function `sumN()` is then called with these numbers as arguments, and the difference is calculated and printed. Please note that the function `sumN()` uses the formula for the sum of an arithmetic series, which is `n * (n + 1) / 2`. This formula calculates the sum of all integers from 1 to `n`. For the test cases provided, if you input `3456` and `3455`, the output will be `1`. If you input `1804` and `1604`, the output will be `2`.

Question

Here is a simple C program that calculates the value of the expression `sumN(3456) - sumN(3455)`. The function `sumN()` calculates the sum of all integers from 1 to `n`.

```c
#include <stdio.h>

// Function to calculate sum of first n numbers
int sumN(int n) {
    return n * (n + 1) / 2;
}

int main() {
    int num1, num2;
    
    // Get the input from the user
    printf("Enter the first number: ");
    scanf("%d", &num1);
    printf("Enter the second number: ");
    scanf("%d", &num2);

// Calculate the value of the expression
    int result = sumN(num1) - sumN(num2);

printf("The result is: %d
", result);

return 0;
}
```

In this program, the user is asked to enter two numbers. The function `sumN()` is then called with these numbers as arguments, and the difference is calculated and printed.

Please note that the function `sumN()` uses the formula for the sum of an arithmetic series, which is `n * (n + 1) / 2`. This formula calculates the sum of all integers from 1 to `n`.

For the test cases provided, if you input `3456` and `3455`, the output will be `1`. If you input `1804` and `1604`, the output will be `2`.

Knowee AI · Accepted Answer