Help me in solving CLB055 problem

help
,
1

My issue

Calculator
Complete the given program to create a simple calculator that performs addition and subtraction.

Declare 2 integer variables a and b
Initialize the variables a and b with two user inputs.
Declare an integer variable sum - and assign the value of addition of a and b to it.
Declare another integer variable diff - and assign the value of subtraction of a and b to it.
Output sum and diff to the console on separate lines with the same message as given in sample output

My code

#include <stdio.h>

int main() {
    int a=23, b=35;
    int sum;
    int diff;
    scanf("%d", & a);
    scanf("%d", & b);
    sum=a+b;
    diff=a-b;
    printf("sum: %d\n", sum);
    printf("difference: %d\n", diff);

}

Learning course: Programming and Problem solving using C
Problem Link: https://www.codechef.com/learn/course/ciet-programming-c/CIETPC13/problems/CLB055