Operators

We already saw +, -, *, / in earlier lessons. Let's look at the rest of C's arithmetic toolkit

#include <stdio.h>

int main(void) {
    int a = 17;
    int b = 5;

    printf("%d\n", a + b);   // addition
    printf("%d\n", a - b);   // subtraction
    printf("%d\n", a * b);   // multiplication
    printf("%d\n", a / b);   // division
    printf("%d\n", a % b);   // remainder (modulo)

    return 0;
}

Output

The interesting one is a / b = 3, not 3.4. Why? a and b are both int, so C does integer division and throws away the decimal part. We covered this in variables-float

The new operator is %, called modulo (or "remainder")

#include <stdio.h>

int main(void) {
    printf("%d\n", 17 % 5);   // 2
    printf("%d\n", 20 % 4);   // 0
    return 0;
}

17 / 5 = 3 with remainder 2, so 17 % 5 = 2. 20 / 4 = 5 exactly, so the remainder is 0

Classic use case: checking if a number is even

#include <stdio.h>

int main(void) {
    int n = 10;
    if (n % 2 == 0) {
        printf("even\n");
    } else {
        printf("odd\n");
    }
    return 0;
}

C has handy shortcuts

a++ is the same as a = a + 1
a-- is the same as a = a - 1
a += 5 is the same as a = a + 5
a -= 3 is the same as a = a - 3
a *= 2 is the same as a = a * 2
a /= 4 is the same as a = a / 4

You'll see i++ in for loops absolutely everywhere

What about powers? C doesn't have a built-in power operator. We use pow() from the math library

#include <stdio.h>
#include <math.h>

int main(void) {
    printf("%f\n", pow(2, 3));   // 8.000000
    return 0;
}

pow() always returns a double, so even 2 to the power of 3 comes out as 8.000000, not 8

To use pow() we need #include <math.h>. On some systems, you also need to link the math library with -lm when compiling, but our platform handles that for us

The order of operations is the same as in math: * and / before + and -

#include <stdio.h>

int main(void) {
    printf("%d\n", 2 + 3 * 4);     // 14, not 20
    printf("%d\n", (2 + 3) * 4);   // 20
    return 0;
}

When in doubt, add parentheses. They make the code easier to read anyway

Mission: The Mainframe's Diagnostic Panel

The mainframe's diagnostic panel reads two values from the console and runs the five basic arithmetic operations, so the shift technician can quickly verify the arithmetic unit is working correctly.

Read two integers a and b using scanf, then print the results of a + b, a - b, a * b, a / b, and a % b, each on its own line. Read the input directly; don't print a question before reading.

Example

Input

17 5

Output

Example

Input

20 4

Output