#include<stdio.h>
#include<stdlib.h>

void main() {
    int number, number1 = 9, number2 = 1;
    int sum, sub, mul, mod;
    float div;
    
    void numberInput() {
        printf("Enter First Number: ");
        scanf("%d", & number1);
        printf("Enter Second Number: ");
        scanf("%d", & number2);
    }
    
    
    printf("nn tSimple Calculatorn");
    printf("1.Additionn");
    printf("2.Subtractionn");
    printf("3.Divsionn");
    printf("4.Multiplicationn");
    printf("5.Remaindern");
    printf("6.Exitn");
    printf("nChoose Operation: ");
    scanf("%d", &number);
    
    if (number == 1) {
        printf("n Additionn");
        numberInput();
        printf("n Addition: %d", number1 + number2);
    } 
    else if (number == 2) {
        printf("n Subtractionn");
        numberInput();
        printf("n Subtraction: %d", number1 - number2);
    } 
    else if (number == 3) {
        printf("n Divisionn");
        numberInput();
        printf("n Division: %d", number1/number2);
    } 
    else if (number == 4) {
        printf("n Multiplicationn");
       numberInput();
        printf("n Multiplication: %d", number1*number2);
    } 
    else if (number == 5) {
        printf("n Remaindern");
         numberInput();
        printf("n Remainder: %d", number1%number2);
    } 
    else if (number == 6) {
        exit(0);
    } 
    else {
        printf("n Please Choose Correct Input");
    }
}

Simple Calculator
1.Addition
2.Subtraction
3.Divsion
4.Multiplication
5.Remainder
6.Exit

Choose Operation: 1
Addition
Enter First Number: 12
Enter Second Number: 56
Addition: 68