Write a program that calculates the sum of four numbers of type int entered on the keyboard,

• using 5 variables (saving of the entered values)
• using 2 variables (loss of the entered values)

#include <stdio.h>
int main()
{
    int a, b, c, d, sum;
    printf("Enter 4 integer variables: ");
    scanf("%d %d %d %d",&a, &b, &c, &d);
    sum = a + b + c + d;
    printf("%d + %d + %d + %d = %d\n", a, b ,c ,d, sum);
    
    return 0;
}

#include <stdio.h>
int main()
{
    int a, sum;
    printf("Enter an integer: ");
    scanf("%d",&a);
    sum = a;
    
    printf("Enter a second integer: ");
    scanf("%d",&a);
    sum = sum + a;
    
    printf("Enter a third integer: ");
    scanf("%d",&a);
    sum = sum + a;
    
    printf("Enter a fourth integer: ");
    scanf("%d",&a);
    sum = sum + a;
    
    printf("Sum = %d\n", sum);
    
    return 0;
}